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MYSQLBINLOG(1) MySQL Database System MYSQLBINLOG(1)
NAME
mysqlbinlog - utility for processing binary log files
SYNOPSIS
mysqlbinlog [options] log_file ...
DESCRIPTION
The server's binary log consists of files containing "events" that describe modifications
to database contents. The server writes these files in binary format. To display their
contents in text format, use the mysqlbinlog utility. You can also use mysqlbinlog to
display the contents of relay log files written by a slave server in a replication setup
because relay logs have the same format as binary logs. The binary log and relay log are
discussed further in Section 5.4.4, "The Binary Log", and Section 16.2.4, "Replication
Relay and Status Logs".
Invoke mysqlbinlog like this:
shell> mysqlbinlog [options] log_file ...
For example, to display the contents of the binary log file named binlog.000003, use this
command:
shell> mysqlbinlog binlog.0000003
The output includes events contained in binlog.000003. For statement-based logging, event
information includes the SQL statement, the ID of the server on which it was executed, the
timestamp when the statement was executed, how much time it took, and so forth. For
row-based logging, the event indicates a row change rather than an SQL statement. See
Section 16.2.1, "Replication Formats", for information about logging modes.
Events are preceded by header comments that provide additional information. For example:
# at 141
#100309 9:28:36 server id 123 end_log_pos 245
Query thread_id=3350 exec_time=11 error_code=0
In the first line, the number following at indicates the file offset, or starting
position, of the event in the binary log file.
The second line starts with a date and time indicating when the statement started on the
server where the event originated. For replication, this timestamp is propagated to slave
servers. server id is the server_id value of the server where the event originated.
end_log_pos indicates where the next event starts (that is, it is the end position of the
current event + 1). thread_id indicates which thread executed the event. exec_time is
the time spent executing the event, on a master server. On a slave, it is the difference
of the end execution time on the slave minus the beginning execution time on the master.
The difference serves as an indicator of how much replication lags behind the master.
error_code indicates the result from executing the event. Zero means that no error
occurred.
Note
When using event groups, the file offsets of events may be grouped together and the
comments of events may be grouped together. Do not mistake these grouped events for
blank file offsets.
The output from mysqlbinlog can be re-executed (for example, by using it as input to
mysql) to redo the statements in the log. This is useful for recovery operations after a
server crash. For other usage examples, see the discussion later in this section and in
Section 7.5, "Point-in-Time (Incremental) Recovery Using the Binary Log".
Normally, you use mysqlbinlog to read binary log files directly and apply them to the
local MySQL server. It is also possible to read binary logs from a remote server by using
the --read-from-remote-server option. To read remote binary logs, the connection parameter
options can be given to indicate how to connect to the server. These options are --host,
--password, --port, --protocol, --socket, and --user; they are ignored except when you
also use the --read-from-remote-server option.
When running mysqlbinlog against a large binary log, be careful that the filesystem has
enough space for the resulting files. To configure the directory that mysqlbinlog uses for
temporary files, use the TMPDIR environment variable.
mysqlbinlog supports the following options, which can be specified on the command line or
in the [mysqlbinlog] and [client] groups of an option file. For information about option
files used by MySQL programs, see Section 4.2.6, "Using Option Files".
o --help, -?
Display a help message and exit.
o --base64-output=value
This option determines when events should be displayed encoded as base-64 strings
using BINLOG statements. The option has these permissible values (not case-sensitive):
o AUTO ("automatic") or UNSPEC ("unspecified") displays BINLOG statements
automatically when necessary (that is, for format description events and row
events). If no --base64-output option is given, the effect is the same as
--base64-output=AUTO.
Note
Automatic BINLOG display is the only safe behavior if you intend to use the
output of mysqlbinlog to re-execute binary log file contents. The other option
values are intended only for debugging or testing purposes because they may
produce output that does not include all events in executable form.
o NEVER causes BINLOG statements not to be displayed. mysqlbinlog exits with an
error if a row event is found that must be displayed using BINLOG.
o DECODE-ROWS specifies to mysqlbinlog that you intend for row events to be decoded
and displayed as commented SQL statements by also specifying the --verbose option.
Like NEVER, DECODE-ROWS suppresses display of BINLOG statements, but unlike NEVER,
it does not exit with an error if a row event is found.
For examples that show the effect of --base64-output and --verbose on row event
output, see the section called "MYSQLBINLOG ROW EVENT DISPLAY".
o --bind-address=ip_address
On a computer having multiple network interfaces, use this option to select which
interface to use for connecting to the MySQL server.
o --binlog-row-event-max-size=N
+---------------------------------+-------------------------------+
|Property | Value |
+---------------------------------+-------------------------------+
|Command-Line Format | --binlog-row-event-max-size=# |
+---------------------------------+-------------------------------+
|Type (64-bit platforms) | numeric |
+---------------------------------+-------------------------------+
|Default Value (64-bit platforms) | 4294967040 |
+---------------------------------+-------------------------------+
|Minimum Value (64-bit platforms) | 256 |
+---------------------------------+-------------------------------+
|Maximum Value (64-bit platforms) | 18446744073709547520 |
+---------------------------------+-------------------------------+
Specify the maximum size of a row-based binary log event, in bytes. Rows are grouped
into events smaller than this size if possible. The value should be a multiple of 256.
The default is 4GB.
o --character-sets-dir=dir_name
The directory where character sets are installed. See Section 10.14, "Character Set
Configuration".
o --connection-server-id=server_id
This option is used to test a MySQL server for support of the BINLOG_DUMP_NON_BLOCK
connection flag, which was inadvertently removed in MySQL 5.6.5, and restored in MySQL
5.7.5 (Bug #18000079, Bug #71178). It is not required for normal operations.
The effective default and minimum values for this option depend on whether mysqlbinlog
is run in blocking mode or non-blocking mode. When mysqlbinlog is run in blocking
mode, the default (and minimum) value is 1; when run in non-blocking mode, the default
(and minimum) value is 0.
This option was added in MySQL 5.7.5
o --database=db_name, -d db_name
This option causes mysqlbinlog to output entries from the binary log (local log only)
that occur while db_name is been selected as the default database by USE.
The --database option for mysqlbinlog is similar to the --binlog-do-db option for
mysqld, but can be used to specify only one database. If --database is given multiple
times, only the last instance is used.
The effects of this option depend on whether the statement-based or row-based logging
format is in use, in the same way that the effects of --binlog-do-db depend on whether
statement-based or row-based logging is in use.
Statement-based logging. The --database option works as follows:
o While db_name is the default database, statements are output whether they modify
tables in db_name or a different database.
o Unless db_name is selected as the default database, statements are not output,
even if they modify tables in db_name.
o There is an exception for CREATE DATABASE, ALTER DATABASE, and DROP DATABASE. The
database being created, altered, or dropped is considered to be the default
database when determining whether to output the statement.
Suppose that the binary log was created by executing these statements using
statement-based-logging:
INSERT INTO test.t1 (i) VALUES(100);
INSERT INTO db2.t2 (j) VALUES(200);
USE test;
INSERT INTO test.t1 (i) VALUES(101);
INSERT INTO t1 (i) VALUES(102);
INSERT INTO db2.t2 (j) VALUES(201);
USE db2;
INSERT INTO test.t1 (i) VALUES(103);
INSERT INTO db2.t2 (j) VALUES(202);
INSERT INTO t2 (j) VALUES(203);
mysqlbinlog --database=test does not output the first two INSERT statements because
there is no default database. It outputs the three INSERT statements following USE
test, but not the three INSERT statements following USE db2.
mysqlbinlog --database=db2 does not output the first two INSERT statements because
there is no default database. It does not output the three INSERT statements following
USE test, but does output the three INSERT statements following USE db2.
Row-based logging. mysqlbinlog outputs only entries that change tables belonging to
db_name. The default database has no effect on this. Suppose that the binary log just
described was created using row-based logging rather than statement-based logging.
mysqlbinlog --database=test outputs only those entries that modify t1 in the test
database, regardless of whether USE was issued or what the default database is. If a
server is running with binlog_format set to MIXED and you want it to be possible to
use mysqlbinlog with the --database option, you must ensure that tables that are
modified are in the database selected by USE. (In particular, no cross-database
updates should be used.)
Prior to MySQL 5.7.1, the --database option did not work correctly with a log written
by a GTID-enabled MySQL server. (Bug #15912728)
When used together with the --rewrite-db option (available in MySQL 5.7.1 and later),
the --rewrite-db option is applied first; then the --database option is applied, using
the rewritten database name. The order in which the options are provided makes no
difference in this regard.
o --debug[=debug_options], -# [debug_options]
Write a debugging log. A typical debug_options string is d:t:o,file_name. The default
is d:t:o,/tmp/mysqlbinlog.trace.
o --debug-check
Print some debugging information when the program exits.
o --debug-info
Print debugging information and memory and CPU usage statistics when the program
exits.
o --default-auth=plugin
A hint about the client-side authentication plugin to use. See Section 6.3.9,
"Pluggable Authentication".
o --defaults-extra-file=file_name
Read this option file after the global option file but (on Unix) before the user
option file. If the file does not exist or is otherwise inaccessible, an error occurs.
file_name is interpreted relative to the current directory if given as a relative path
name rather than a full path name.
o --defaults-file=file_name
Use only the given option file. If the file does not exist or is otherwise
inaccessible, an error occurs. file_name is interpreted relative to the current
directory if given as a relative path name rather than a full path name.
Exception: Even with --defaults-file, client programs read .mylogin.cnf.
o --defaults-group-suffix=str
Read not only the usual option groups, but also groups with the usual names and a
suffix of str. For example, mysqlbinlog normally reads the [client] and [mysqlbinlog]
groups. If the --defaults-group-suffix=_other option is given, mysqlbinlog also reads
the [client_other] and [mysqlbinlog_other] groups.
o --disable-log-bin, -D
Disable binary logging. This is useful for avoiding an endless loop if you use the
--to-last-log option and are sending the output to the same MySQL server. This option
also is useful when restoring after a crash to avoid duplication of the statements you
have logged.
This option requires that you have the SUPER privilege. It causes mysqlbinlog to
include a SET sql_log_bin = 0 statement in its output to disable binary logging of the
remaining output. The SET statement is ineffective unless you have the SUPER
privilege.
o --exclude-gtids=gtid_set
Do not display any of the groups listed in the gtid_set.
o --force-if-open, -F
Read binary log files even if they are open or were not closed properly.
o --force-read, -f
With this option, if mysqlbinlog reads a binary log event that it does not recognize,
it prints a warning, ignores the event, and continues. Without this option,
mysqlbinlog stops if it reads such an event.
o --get-server-public-key
Request from the server the public key required for RSA key pair-based password
exchange. This option applies to clients that that authenticate with the
caching_sha2_password authentication plugin. For that plugin, the server does not send
the public key unless requested. This option is ignored for accounts that do not
authenticate with that plugin. It is also ignored if RSA-based password exchange is
not used, as is the case when the client connects to the server using a secure
connection.
If --server-public-key-path=file_name is given and specifies a valid public key file,
it takes precedence over --get-server-public-key.
For information about the caching_sha2_password plugin, see Section 6.5.1.5, "Caching
SHA-2 Pluggable Authentication".
The --get-server-public-key option was added in MySQL 5.7.23.
o --hexdump, -H
Display a hex dump of the log in comments, as described in the section called
"MYSQLBINLOG HEX DUMP FORMAT". The hex output can be helpful for replication
debugging.
o --host=host_name, -h host_name
Get the binary log from the MySQL server on the given host.
o --idempotent
Tell the MySQL Server to use idempotent mode while processing updates; this causes
suppression of any duplicate-key or key-not-found errors that the server encounters in
the current session while processing updates. This option may prove useful whenever it
is desirable or necessary to replay one or more binary logs to a MySQL Server which
may not contain all of the data to which the logs refer.
The scope of effect for this option includes the current mysqlbinlog client and
session only.
The --idempotent option was introduced in MySQL 5.7.0.
o --include-gtids=gtid_set
Display only the groups listed in the gtid_set.
o --local-load=dir_name, -l dir_name
Prepare local temporary files for LOAD DATA INFILE in the specified directory.
Important
These temporary files are not automatically removed by mysqlbinlog or any other
MySQL program.
o --login-path=name
Read options from the named login path in the .mylogin.cnf login path file. A "login
path" is an option group containing options that specify which MySQL server to connect
to and which account to authenticate as. To create or modify a login path file, use
the mysql_config_editor utility. See mysql_config_editor(1).
o --no-defaults
Do not read any option files. If program startup fails due to reading unknown options
from an option file, --no-defaults can be used to prevent them from being read.
The exception is that the .mylogin.cnf file, if it exists, is read in all cases. This
permits passwords to be specified in a safer way than on the command line even when
--no-defaults is used. (.mylogin.cnf is created by the mysql_config_editor utility.
See mysql_config_editor(1).)
o --offset=N, -o N
Skip the first N entries in the log.
o --password[=password], -p[password]
The password to use when connecting to the server. If you use the short option form
(-p), you cannot have a space between the option and the password. If you omit the
password value following the --password or -p option on the command line, mysqlbinlog
prompts for one.
Specifying a password on the command line should be considered insecure. See
Section 6.1.2.1, "End-User Guidelines for Password Security". You can use an option
file to avoid giving the password on the command line.
o --plugin-dir=dir_name
The directory in which to look for plugins. Specify this option if the --default-auth
option is used to specify an authentication plugin but mysqlbinlog does not find it.
See Section 6.3.9, "Pluggable Authentication".
o --port=port_num, -P port_num
The TCP/IP port number to use for connecting to a remote server.
o --print-defaults
Print the program name and all options that it gets from option files.
o --protocol={TCP|SOCKET|PIPE|MEMORY}
The connection protocol to use for connecting to the server. It is useful when the
other connection parameters normally would cause a protocol to be used other than the
one you want. For details on the permissible values, see Section 4.2.2, "Connecting to
the MySQL Server".
o --raw
By default, mysqlbinlog reads binary log files and writes events in text format. The
--raw option tells mysqlbinlog to write them in their original binary format. Its use
requires that --read-from-remote-server also be used because the files are requested
from a server. mysqlbinlog writes one output file for each file read from the server.
The --raw option can be used to make a backup of a server's binary log. With the
--stop-never option, the backup is "live" because mysqlbinlog stays connected to the
server. By default, output files are written in the current directory with the same
names as the original log files. Output file names can be modified using the
--result-file option. For more information, see the section called "USING MYSQLBINLOG
TO BACK UP BINARY LOG FILES".
o --read-from-remote-master=type
Read binary logs from a MySQL server with the COM_BINLOG_DUMP or COM_BINLOG_DUMP_GTID
commands by setting the option value to either BINLOG-DUMP-NON-GTIDS or
BINLOG-DUMP-GTIDS, respectively. If --read-from-remote-master=BINLOG-DUMP-GTIDS is
combined with --exclude-gtids, transactions can be filtered out on the master,
avoiding unnecessary network traffic.
See also the description for --read-from-remote-server.
o --read-from-remote-server, -R
Read the binary log from a MySQL server rather than reading a local log file. Any
connection parameter options are ignored unless this option is given as well. These
options are --host, --password, --port, --protocol, --socket, and --user.
This option requires that the remote server be running. It works only for binary log
files on the remote server, not relay log files.
This option is like --read-from-remote-master=BINLOG-DUMP-NON-GTIDS.
o --result-file=name, -r name
Without the --raw option, this option indicates the file to which mysqlbinlog writes
text output. With --raw, mysqlbinlog writes one binary output file for each log file
transferred from the server, writing them by default in the current directory using
the same names as the original log file. In this case, the --result-file option value
is treated as a prefix that modifies output file names.
o --rewrite-db='from_name->to_name'
In MySQL 5.7.8 and later, when reading from a row-based or statement-based log,
rewrite all occurrences of from_name to to_name. Rewriting is done on the rows, for
row-based logs, as well as on the USE clauses, for statement-based logs. In MySQL
versions prior to 5.7.8, this option was only for use when restoring tables logged
using the row-based format.
Warning
Statements in which table names are qualified with database names are not
rewritten to use the new name when using this option.
The rewrite rule employed as a value for this option is a string having the form
'from_name->to_name', as shown previously, and for this reason must be enclosed by
quotation marks.
To employ multiple rewrite rules, specify the option multiple times, as shown here:
shell> mysqlbinlog --rewrite-db='dbcurrent->dbold' --rewrite-db='dbtest->dbcurrent' \
binlog.00001 > /tmp/statements.sql
When used together with the --database option, the --rewrite-db option is applied
first; then --database option is applied, using the rewritten database name. The order
in which the options are provided makes no difference in this regard.
This means that, for example, if mysqlbinlog is started with
--rewrite-db='mydb->yourdb' --database=yourdb, then all updates to any tables in
databases mydb and yourdb are included in the output. On the other hand, if it is
started with --rewrite-db='mydb->yourdb' --database=mydb, then mysqlbinlog outputs no
statements at all: since all updates to mydb are first rewritten as updates to yourdb
before applying the --database option, there remain no updates that match
--database=mydb.
This option was added in MySQL 5.7.1.
o --secure-auth
Do not send passwords to the server in old (pre-4.1) format. This prevents connections
except for servers that use the newer password format. This option was added in MySQL
5.7.4.
As of MySQL 5.7.5, this option is deprecated and will be removed in a future MySQL
release. It is always enabled and attempting to disable it (--skip-secure-auth,
--secure-auth=0) produces an error. Before MySQL 5.7.5, this option is enabled by
default but can be disabled.
Note
Passwords that use the pre-4.1 hashing method are less secure than passwords that
use the native password hashing method and should be avoided. Pre-4.1 passwords
are deprecated and support for them was removed in MySQL 5.7.5. For account
upgrade instructions, see Section 6.5.1.3, "Migrating Away from Pre-4.1 Password
Hashing and the mysql_old_password Plugin".
o --server-id=id
Display only those events created by the server having the given server ID.
o --server-id-bits=N
Use only the first N bits of the server_id to identify the server. If the binary log
was written by a mysqld with server-id-bits set to less than 32 and user data stored
in the most significant bit, running mysqlbinlog with --server-id-bits set to 32
enables this data to be seen.
This option is supported only by the versions of mysqlbinlog supplied with the NDB
Cluster distribution, or built from the NDB Cluster sources.
o --server-public-key-path=file_name
The path name to a file containing a client-side copy of the public key required by
the server for RSA key pair-based password exchange. The file must be in PEM format.
This option applies to clients that authenticate with the sha256_password or
caching_sha2_password authentication plugin. This option is ignored for accounts that
do not authenticate with one of those plugins. It is also ignored if RSA-based
password exchange is not used, as is the case when the client connects to the server
using a secure connection.
If --server-public-key-path=file_name is given and specifies a valid public key file,
it takes precedence over --get-server-public-key.
For sha256_password, this option applies only if MySQL was built using OpenSSL.
For information about the sha256_password and caching_sha2_password plugins, see
Section 6.5.1.4, "SHA-256 Pluggable Authentication", and Section 6.5.1.5, "Caching
SHA-2 Pluggable Authentication".
The --server-public-key-path option was added in MySQL 5.7.23.
o --set-charset=charset_name
Add a SET NAMES charset_name statement to the output to specify the character set to
be used for processing log files.
o --shared-memory-base-name=name
On Windows, the shared-memory name to use, for connections made using shared memory to
a local server. The default value is MYSQL. The shared-memory name is case-sensitive.
The server must be started with the --shared-memory option to enable shared-memory
connections.
o --short-form, -s
Display only the statements contained in the log, without any extra information or
row-based events. This is for testing only, and should not be used in production
systems.
o --skip-gtids[=(true|false)]
Do not display any GTIDs in the output. This is needed when writing to a dump file
from one or more binary logs containing GTIDs, as shown in this example:
shell> mysqlbinlog --skip-gtids binlog.000001 > /tmp/dump.sql
shell> mysqlbinlog --skip-gtids binlog.000002 >> /tmp/dump.sql
shell> mysql -u root -p -e "source /tmp/dump.sql"
The use of this option is otherwise not normally recommended in production.
o --socket=path, -S path
For connections to localhost, the Unix socket file to use, or, on Windows, the name of
the named pipe to use.
o --ssl*
Options that begin with --ssl specify whether to connect to the server using SSL and
indicate where to find SSL keys and certificates. See Section 6.4.2, "Command Options
for Encrypted Connections".
o --start-datetime=datetime
Start reading the binary log at the first event having a timestamp equal to or later
than the datetime argument. The datetime value is relative to the local time zone on
the machine where you run mysqlbinlog. The value should be in a format accepted for
the DATETIME or TIMESTAMP data types. For example:
shell> mysqlbinlog --start-datetime="2005-12-25 11:25:56" binlog.000003
This option is useful for point-in-time recovery. See Section 7.3, "Example Backup and
Recovery Strategy".
o --start-position=N, -j N
Start reading the binary log at the first event having a position equal to or greater
than N. This option applies to the first log file named on the command line.
This option is useful for point-in-time recovery. See Section 7.3, "Example Backup and
Recovery Strategy".
o --stop-datetime=datetime
Stop reading the binary log at the first event having a timestamp equal to or later
than the datetime argument. This option is useful for point-in-time recovery. See the
description of the --start-datetime option for information about the datetime value.
This option is useful for point-in-time recovery. See Section 7.3, "Example Backup and
Recovery Strategy".
o --stop-never
This option is used with --read-from-remote-server. It tells mysqlbinlog to remain
connected to the server. Otherwise mysqlbinlog exits when the last log file has been
transferred from the server. --stop-never implies --to-last-log, so only the first
log file to transfer need be named on the command line.
--stop-never is commonly used with --raw to make a live binary log backup, but also
can be used without --raw to maintain a continuous text display of log events as the
server generates them.
o --stop-never-slave-server-id=id
With --stop-never, mysqlbinlog reports a server ID of 65535 when it connects to the
server. --stop-never-slave-server-id explicitly specifies the server ID to report. It
can be used to avoid a conflict with the ID of a slave server or another mysqlbinlog
process. See the section called "SPECIFYING THE MYSQLBINLOG SERVER ID".
o --stop-position=N
Stop reading the binary log at the first event having a position equal to or greater
than N. This option applies to the last log file named on the command line.
This option is useful for point-in-time recovery. See Section 7.3, "Example Backup and
Recovery Strategy".
o --tls-version=protocol_list
The protocols permitted by the client for encrypted connections. The value is a
comma-separated list containing one or more protocol names. The protocols that can be
named for this option depend on the SSL library used to compile MySQL. For details,
see Section 6.4.6, "Encrypted Connection Protocols and Ciphers".
This option was added in MySQL 5.7.10.
o --to-last-log, -t
Do not stop at the end of the requested binary log from a MySQL server, but rather
continue printing until the end of the last binary log. If you send the output to the
same MySQL server, this may lead to an endless loop. This option requires
--read-from-remote-server.
o --user=user_name, -u user_name
The MySQL user name to use when connecting to a remote server.
o --verbose, -v
Reconstruct row events and display them as commented SQL statements. If this option is
given twice (by passing in either "-vv" or "--verbose --verbose"), the output includes
comments to indicate column data types and some metadata, and row query log events if
so configured.
For examples that show the effect of --base64-output and --verbose on row event
output, see the section called "MYSQLBINLOG ROW EVENT DISPLAY".
o --verify-binlog-checksum, -c
Verify checksums in binary log files.
o --version, -V
Display version information and exit.
In MySQL 5.7, the mysqlbinlog version number is 3.4.
You can also set the following variable by using --var_name=value syntax:
o open_files_limit
Specify the number of open file descriptors to reserve.
You can pipe the output of mysqlbinlog into the mysql client to execute the events
contained in the binary log. This technique is used to recover from a crash when you have
an old backup (see Section 7.5, "Point-in-Time (Incremental) Recovery Using the Binary
Log"). For example:
shell> mysqlbinlog binlog.000001 | mysql -u root -p
Or:
shell> mysqlbinlog binlog.[0-9]* | mysql -u root -p
If the statements produced by mysqlbinlog may contain BLOB values, these may cause
problems when mysql processes them. In this case, invoke mysql with the --binary-mode
option.
You can also redirect the output of mysqlbinlog to a text file instead, if you need to
modify the statement log first (for example, to remove statements that you do not want to
execute for some reason). After editing the file, execute the statements that it contains
by using it as input to the mysql program:
shell> mysqlbinlog binlog.000001 > tmpfile
shell> ... edit tmpfile ...
shell> mysql -u root -p < tmpfile
When mysqlbinlog is invoked with the --start-position option, it displays only those
events with an offset in the binary log greater than or equal to a given position (the
given position must match the start of one event). It also has options to stop and start
when it sees an event with a given date and time. This enables you to perform
point-in-time recovery using the --stop-datetime option (to be able to say, for example,
"roll forward my databases to how they were today at 10:30 a.m.").
If you have more than one binary log to execute on the MySQL server, the safe method is to
process them all using a single connection to the server. Here is an example that
demonstrates what may be unsafe:
shell> mysqlbinlog binlog.000001 | mysql -u root -p # DANGER!!
shell> mysqlbinlog binlog.000002 | mysql -u root -p # DANGER!!
Processing binary logs this way using multiple connections to the server causes problems
if the first log file contains a CREATE TEMPORARY TABLE statement and the second log
contains a statement that uses the temporary table. When the first mysql process
terminates, the server drops the temporary table. When the second mysql process attempts
to use the table, the server reports "unknown table."
To avoid problems like this, use a single mysql process to execute the contents of all
binary logs that you want to process. Here is one way to do so:
shell> mysqlbinlog binlog.000001 binlog.000002 | mysql -u root -p
Another approach is to write all the logs to a single file and then process the file:
shell> mysqlbinlog binlog.000001 > /tmp/statements.sql
shell> mysqlbinlog binlog.000002 >> /tmp/statements.sql
shell> mysql -u root -p -e "source /tmp/statements.sql"
mysqlbinlog can produce output that reproduces a LOAD DATA INFILE operation without the
original data file. mysqlbinlog copies the data to a temporary file and writes a LOAD
DATA LOCAL INFILE statement that refers to the file. The default location of the directory
where these files are written is system-specific. To specify a directory explicitly, use
the --local-load option.
Because mysqlbinlog converts LOAD DATA INFILE statements to LOAD DATA LOCAL INFILE
statements (that is, it adds LOCAL), both the client and the server that you use to
process the statements must be configured with the LOCAL capability enabled. See
Section 6.1.6, "Security Issues with LOAD DATA LOCAL".
Warning
The temporary files created for LOAD DATA LOCAL statements are not automatically
deleted because they are needed until you actually execute those statements. You
should delete the temporary files yourself after you no longer need the statement log.
The files can be found in the temporary file directory and have names like
original_file_name-#-#.
MYSQLBINLOG HEX DUMP FORMAT
The --hexdump option causes mysqlbinlog to produce a hex dump of the binary log contents:
shell> mysqlbinlog --hexdump master-bin.000001
The hex output consists of comment lines beginning with #, so the output might look like
this for the preceding command:
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
# at 4
#051024 17:24:13 server id 1 end_log_pos 98
# Position Timestamp Type Master ID Size Master Pos Flags
# 00000004 9d fc 5c 43 0f 01 00 00 00 5e 00 00 00 62 00 00 00 00 00
# 00000017 04 00 35 2e 30 2e 31 35 2d 64 65 62 75 67 2d 6c |..5.0.15.debug.l|
# 00000027 6f 67 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |og..............|
# 00000037 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
# 00000047 00 00 00 00 9d fc 5c 43 13 38 0d 00 08 00 12 00 |.......C.8......|
# 00000057 04 04 04 04 12 00 00 4b 00 04 1a |.......K...|
# Start: binlog v 4, server v 5.0.15-debug-log created 051024 17:24:13
# at startup
ROLLBACK;
Hex dump output currently contains the elements in the following list. This format is
subject to change. (For more information about binary log format, see MySQL Internals: The
Binary Log[1].
o Position: The byte position within the log file.
o Timestamp: The event timestamp. In the example shown, '9d fc 5c 43' is the
representation of '051024 17:24:13' in hexadecimal.
o Type: The event type code. In the example shown, '0f' indicates a
FORMAT_DESCRIPTION_EVENT. The following table lists the possible type codes.
+-----+--------------------------+------------------------------------+
|Type | Name | Meaning |
+-----+--------------------------+------------------------------------+
|00 | UNKNOWN_EVENT | This event should never |
| | | be present in the log. |
+-----+--------------------------+------------------------------------+
|01 | START_EVENT_V3 | This indicates the start |
| | | of a log file written by |
| | | MySQL 4 or earlier. |
+-----+--------------------------+------------------------------------+
|02 | QUERY_EVENT | The most common type of |
| | | events. These contain |
| | | statements executed on |
| | | the |
| | | master. |
+-----+--------------------------+------------------------------------+
|03 | STOP_EVENT | Indicates that master has |
| | | stopped. |
+-----+--------------------------+------------------------------------+
|04 | ROTATE_EVENT | Written when the master |
| | | switches to a new log |
| | | file. |
+-----+--------------------------+------------------------------------+
|05 | INTVAR_EVENT | Used for AUTO_INCREMENT |
| | | values or when the |
| | | LAST_INSERT_ID() |
| | | function |
| | | is used in the statement. |
+-----+--------------------------+------------------------------------+
|06 | LOAD_EVENT | Used for LOAD DATA |
| | | INFILE in MySQL |
| | | 3.23. |
+-----+--------------------------+------------------------------------+
|07 | SLAVE_EVENT | Reserved for future use. |
+-----+--------------------------+------------------------------------+
|08 | CREATE_FILE_EVENT | Used for LOAD DATA |
| | | INFILE |
| | | statements. This indicates the |
| | | start |
| | | of execution of |
| | | such a statement. A temporary file |
| | | is |
| | | created on the |
| | | slave. Used in MySQL 4 only. |
+-----+--------------------------+------------------------------------+
|09 | APPEND_BLOCK_EVENT | Contains data for use in a |
| | | LOAD DATA |
| | | INFILE |
| | | statement. The data is stored in |
| | | the |
| | | temporary file |
| | | on the slave. |
+-----+--------------------------+------------------------------------+
|0a | EXEC_LOAD_EVENT | Used for LOAD DATA |
| | | INFILE |
| | | statements. The contents of the |
| | | temporary file |
| | | is stored in the table on the |
| | | slave. |
| | | Used in MySQL 4 |
| | | only. |
+-----+--------------------------+------------------------------------+
|0b | DELETE_FILE_EVENT | Rollback of a LOAD DATA |
| | | INFILE |
| | | statement. The temporary file |
| | | should |
| | | be deleted on |
| | | the slave. |
+-----+--------------------------+------------------------------------+
|0c | NEW_LOAD_EVENT | Used for LOAD DATA |
| | | INFILE in MySQL |
| | | 4 and earlier. |
+-----+--------------------------+------------------------------------+
|0d | RAND_EVENT | Used to send information about |
| | | random values if the |
| | | RAND() function |
| | | is used |
| | | in the |
| | | statement. |
+-----+--------------------------+------------------------------------+
|0e | USER_VAR_EVENT | Used to replicate user variables. |
+-----+--------------------------+------------------------------------+
|0f | FORMAT_DESCRIPTION_EVENT | This indicates the start of a log |
| | | file written by MySQL 5 or later. |
+-----+--------------------------+------------------------------------+
|10 | XID_EVENT | Event indicating commit of an XA |
| | | transaction. |
+-----+--------------------------+------------------------------------+
|11 | BEGIN_LOAD_QUERY_EVENT | Used for LOAD DATA |
| | | INFILE |
| | | statements in MySQL 5 and later. |
+-----+--------------------------+------------------------------------+
|12 | EXECUTE_LOAD_QUERY_EVENT | Used for LOAD DATA |
| | | INFILE |
| | | statements in MySQL 5 and later. |
+-----+--------------------------+------------------------------------+
|13 | TABLE_MAP_EVENT | Information about a table |
| | | definition. Used in MySQL 5.1.5 |
| | | and later. |
+-----+--------------------------+------------------------------------+
|14 | PRE_GA_WRITE_ROWS_EVENT | Row data for a single table that |
| | | should be created. Used in MySQL |
| | | 5.1.5 |
| | | to 5.1.17. |
+-----+--------------------------+------------------------------------+
|15 | PRE_GA_UPDATE_ROWS_EVENT | Row data for a single table that |
| | | needs to be updated. Used in MySQL |
| | | 5.1.5 to 5.1.17. |
+-----+--------------------------+------------------------------------+
|16 | PRE_GA_DELETE_ROWS_EVENT | Row data for a single table that |
| | | should be deleted. Used in MySQL |
| | | 5.1.5 |
| | | to 5.1.17. |
+-----+--------------------------+------------------------------------+
|17 | WRITE_ROWS_EVENT | Row data for a single table that |
| | | should be created. Used in MySQL |
| | | 5.1.18 |
| | | and later. |
+-----+--------------------------+------------------------------------+
|18 | UPDATE_ROWS_EVENT | Row data for a single table that |
| | | needs to be updated. Used in MySQL |
| | | 5.1.18 and |
| | | later. |
+-----+--------------------------+------------------------------------+
|19 | DELETE_ROWS_EVENT | Row data for a single table that |
| | | should be deleted. Used in MySQL |
| | | 5.1.18 |
| | | and later. |
+-----+--------------------------+------------------------------------+
|1a | INCIDENT_EVENT | Something out of the ordinary |
| | | happened. Added in MySQL 5.1.18. |
+-----+--------------------------+------------------------------------+
o Master ID: The server ID of the master that created the event.
o Size: The size in bytes of the event.
o Master Pos: The position of the next event in the original master log file.
o Flags: 16 flags. The following flags are used. The others are reserved for future use.
+-----+-----------------------------+----------------------------------------------+
|Flag | Name | Meaning |
+-----+-----------------------------+----------------------------------------------+
|01 | LOG_EVENT_BINLOG_IN_USE_F | Log file correctly |
| | | closed. (Used only in |
| | | FORMAT_DESCRIPTION_EVENT.) |
| | | If this |
| | | flag |
| | | is set (if the flags |
| | | are, for example, |
| | | '01 |
| | | 00') in a |
| | | FORMAT_DESCRIPTION_EVENT, |
| | | the log |
| | | file |
| | | has not been properly |
| | | closed. Most probably |
| | | this |
| | | is |
| | | because of a master |
| | | crash (for example, due |
| | | to |
| | | power |
| | | failure). |
+-----+-----------------------------+----------------------------------------------+
|02 | | Reserved for future use. |
+-----+-----------------------------+----------------------------------------------+
|04 | LOG_EVENT_THREAD_SPECIFIC_F | Set if the event is dependent on the |
| | | connection it was executed in (for |
| | | example, '04 00'), for |
| | | example, if |
| | | the event uses temporary |
| | | tables. |
+-----+-----------------------------+----------------------------------------------+
|08 | LOG_EVENT_SUPPRESS_USE_F | Set in some circumstances when the event is |
| | | not dependent on the default |
| | | database. |
+-----+-----------------------------+----------------------------------------------+
MYSQLBINLOG ROW EVENT DISPLAY
The following examples illustrate how mysqlbinlog displays row events that specify data
modifications. These correspond to events with the WRITE_ROWS_EVENT, UPDATE_ROWS_EVENT,
and DELETE_ROWS_EVENT type codes. The --base64-output=DECODE-ROWS and --verbose options
may be used to affect row event output.
Suppose that the server is using row-based binary logging and that you execute the
following sequence of statements:
CREATE TABLE t
(
id INT NOT NULL,
name VARCHAR(20) NOT NULL,
date DATE NULL
) ENGINE = InnoDB;
START TRANSACTION;
INSERT INTO t VALUES(1, 'apple', NULL);
UPDATE t SET name = 'pear', date = '2009-01-01' WHERE id = 1;
DELETE FROM t WHERE id = 1;
COMMIT;
By default, mysqlbinlog displays row events encoded as base-64 strings using BINLOG
statements. Omitting extraneous lines, the output for the row events produced by the
preceding statement sequence looks like this:
shell> mysqlbinlog log_file
...
# at 218
#080828 15:03:08 server id 1 end_log_pos 258 Write_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAANoAAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBcBAAAAKAAAAAIBAAAQABEAAAAAAAEAA//8AQAAAAVhcHBsZQ==
'/*!*/;
...
# at 302
#080828 15:03:08 server id 1 end_log_pos 356 Update_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAAC4BAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBgBAAAANgAAAGQBAAAQABEAAAAAAAEAA////AEAAAAFYXBwbGX4AQAAAARwZWFyIbIP
'/*!*/;
...
# at 400
#080828 15:03:08 server id 1 end_log_pos 442 Delete_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAAJABAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBkBAAAAKgAAALoBAAAQABEAAAAAAAEAA//4AQAAAARwZWFyIbIP
'/*!*/;
To see the row events as comments in the form of "pseudo-SQL" statements, run mysqlbinlog
with the --verbose or -v option. The output will contain lines beginning with ###:
shell> mysqlbinlog -v log_file
...
# at 218
#080828 15:03:08 server id 1 end_log_pos 258 Write_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAANoAAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBcBAAAAKAAAAAIBAAAQABEAAAAAAAEAA//8AQAAAAVhcHBsZQ==
'/*!*/;
### INSERT INTO test.t
### SET
### @1=1
### @2='apple'
### @3=NULL
...
# at 302
#080828 15:03:08 server id 1 end_log_pos 356 Update_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAAC4BAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBgBAAAANgAAAGQBAAAQABEAAAAAAAEAA////AEAAAAFYXBwbGX4AQAAAARwZWFyIbIP
'/*!*/;
### UPDATE test.t
### WHERE
### @1=1
### @2='apple'
### @3=NULL
### SET
### @1=1
### @2='pear'
### @3='2009:01:01'
...
# at 400
#080828 15:03:08 server id 1 end_log_pos 442 Delete_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAAJABAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBkBAAAAKgAAALoBAAAQABEAAAAAAAEAA//4AQAAAARwZWFyIbIP
'/*!*/;
### DELETE FROM test.t
### WHERE
### @1=1
### @2='pear'
### @3='2009:01:01'
Specify --verbose or -v twice to also display data types and some metadata for each
column. The output will contain an additional comment following each column change:
shell> mysqlbinlog -vv log_file
...
# at 218
#080828 15:03:08 server id 1 end_log_pos 258 Write_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAANoAAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBcBAAAAKAAAAAIBAAAQABEAAAAAAAEAA//8AQAAAAVhcHBsZQ==
'/*!*/;
### INSERT INTO test.t
### SET
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='apple' /* VARSTRING(20) meta=20 nullable=0 is_null=0 */
### @3=NULL /* VARSTRING(20) meta=0 nullable=1 is_null=1 */
...
# at 302
#080828 15:03:08 server id 1 end_log_pos 356 Update_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAAC4BAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBgBAAAANgAAAGQBAAAQABEAAAAAAAEAA////AEAAAAFYXBwbGX4AQAAAARwZWFyIbIP
'/*!*/;
### UPDATE test.t
### WHERE
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='apple' /* VARSTRING(20) meta=20 nullable=0 is_null=0 */
### @3=NULL /* VARSTRING(20) meta=0 nullable=1 is_null=1 */
### SET
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='pear' /* VARSTRING(20) meta=20 nullable=0 is_null=0 */
### @3='2009:01:01' /* DATE meta=0 nullable=1 is_null=0 */
...
# at 400
#080828 15:03:08 server id 1 end_log_pos 442 Delete_rows: table id 17 flags: STMT_END_F
BINLOG '
fAS3SBMBAAAALAAAAJABAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ=
fAS3SBkBAAAAKgAAALoBAAAQABEAAAAAAAEAA//4AQAAAARwZWFyIbIP
'/*!*/;
### DELETE FROM test.t
### WHERE
### @1=1 /* INT meta=0 nullable=0 is_null=0 */
### @2='pear' /* VARSTRING(20) meta=20 nullable=0 is_null=0 */
### @3='2009:01:01' /* DATE meta=0 nullable=1 is_null=0 */
You can tell mysqlbinlog to suppress the BINLOG statements for row events by using the
--base64-output=DECODE-ROWS option. This is similar to --base64-output=NEVER but does not
exit with an error if a row event is found. The combination of --base64-output=DECODE-ROWS
and --verbose provides a convenient way to see row events only as SQL statements:
shell> mysqlbinlog -v --base64-output=DECODE-ROWS log_file
...
# at 218
#080828 15:03:08 server id 1 end_log_pos 258 Write_rows: table id 17 flags: STMT_END_F
### INSERT INTO test.t
### SET
### @1=1
### @2='apple'
### @3=NULL
...
# at 302
#080828 15:03:08 server id 1 end_log_pos 356 Update_rows: table id 17 flags: STMT_END_F
### UPDATE test.t
### WHERE
### @1=1
### @2='apple'
### @3=NULL
### SET
### @1=1
### @2='pear'
### @3='2009:01:01'
...
# at 400
#080828 15:03:08 server id 1 end_log_pos 442 Delete_rows: table id 17 flags: STMT_END_F
### DELETE FROM test.t
### WHERE
### @1=1
### @2='pear'
### @3='2009:01:01'
Note
You should not suppress BINLOG statements if you intend to re-execute mysqlbinlog
output.
The SQL statements produced by --verbose for row events are much more readable than the
corresponding BINLOG statements. However, they do not correspond exactly to the original
SQL statements that generated the events. The following limitations apply:
o The original column names are lost and replaced by @N, where N is a column number.
o Character set information is not available in the binary log, which affects string
column display:
o There is no distinction made between corresponding binary and nonbinary string
types (BINARY and CHAR, VARBINARY and VARCHAR, BLOB and TEXT). The output uses a
data type of STRING for fixed-length strings and VARSTRING for variable-length
strings.
o For multibyte character sets, the maximum number of bytes per character is not
present in the binary log, so the length for string types is displayed in bytes
rather than in characters. For example, STRING(4) will be used as the data type
for values from either of these column types:
CHAR(4) CHARACTER SET latin1
CHAR(2) CHARACTER SET ucs2
o Due to the storage format for events of type UPDATE_ROWS_EVENT, UPDATE statements
are displayed with the WHERE clause preceding the SET clause.
Proper interpretation of row events requires the information from the format description
event at the beginning of the binary log. Because mysqlbinlog does not know in advance
whether the rest of the log contains row events, by default it displays the format
description event using a BINLOG statement in the initial part of the output.
If the binary log is known not to contain any events requiring a BINLOG statement (that
is, no row events), the --base64-output=NEVER option can be used to prevent this header
from being written.
USING MYSQLBINLOG TO BACK UP BINARY LOG FILES
By default, mysqlbinlog reads binary log files and displays their contents in text format.
This enables you to examine events within the files more easily and to re-execute them
(for example, by using the output as input to mysql). mysqlbinlog can read log files
directly from the local file system, or, with the --read-from-remote-server option, it can
connect to a server and request binary log contents from that server. mysqlbinlog writes
text output to its standard output, or to the file named as the value of the
--result-file=file_name option if that option is given.
mysqlbinlog can read binary log files and write new files containing the same content--
that is, in binary format rather than text format. This capability enables you to easily
back up a binary log in its original format. mysqlbinlog can make a static backup,
backing up a set of log files and stopping when the end of the last file is reached. It
can also make a continuous ("live") backup, staying connected to the server when it
reaches the end of the last log file and continuing to copy new events as they are
generated. In continuous-backup operation, mysqlbinlog runs until the connection ends (for
example, when the server exits) or mysqlbinlog is forcibly terminated. When the connection
ends, mysqlbinlog does not wait and retry the connection, unlike a slave replication
server. To continue a live backup after the server has been restarted, you must also
restart mysqlbinlog.
Binary log backup requires that you invoke mysqlbinlog with two options at minimum:
o The --read-from-remote-server (or -R) option tells mysqlbinlog to connect to a server
and request its binary log. (This is similar to a slave replication server connecting
to its master server.)
o The --raw option tells mysqlbinlog to write raw (binary) output, not text output.
Along with --read-from-remote-server, it is common to specify other options: --host
indicates where the server is running, and you may also need to specify connection options
such as --user and --password.
Several other options are useful in conjunction with --raw:
o --stop-never: Stay connected to the server after reaching the end of the last log file
and continue to read new events.
o --stop-never-slave-server-id=id: The server ID that mysqlbinlog reports to the server
when --stop-never is used. The default is 65535. This can be used to avoid a conflict
with the ID of a slave server or another mysqlbinlog process. See the section called
"SPECIFYING THE MYSQLBINLOG SERVER ID".
o --result-file: A prefix for output file names, as described later.
To back up a server's binary log files with mysqlbinlog, you must specify file names that
actually exist on the server. If you do not know the names, connect to the server and use
the SHOW BINARY LOGS statement to see the current names. Suppose that the statement
produces this output:
mysql> SHOW BINARY LOGS;
+---------------+-----------+
| Log_name | File_size |
+---------------+-----------+
| binlog.000130 | 27459 |
| binlog.000131 | 13719 |
| binlog.000132 | 43268 |
+---------------+-----------+
With that information, you can use mysqlbinlog to back up the binary log to the current
directory as follows (enter each command on a single line):
o To make a static backup of binlog.000130 through binlog.000132, use either of these
commands:
mysqlbinlog --read-from-remote-server --host=host_name --raw
binlog.000130 binlog.000131 binlog.000132
mysqlbinlog --read-from-remote-server --host=host_name --raw
--to-last-log binlog.000130
The first command specifies every file name explicitly. The second names only the
first file and uses --to-last-log to read through the last. A difference between these
commands is that if the server happens to open binlog.000133 before mysqlbinlog
reaches the end of binlog.000132, the first command will not read it, but the second
command will.
o To make a live backup in which mysqlbinlog starts with binlog.000130 to copy existing
log files, then stays connected to copy new events as the server generates them:
mysqlbinlog --read-from-remote-server --host=host_name --raw
--stop-never binlog.000130
With --stop-never, it is not necessary to specify --to-last-log to read to the last
log file because that option is implied.
Output File Naming.PP Without --raw, mysqlbinlog produces text output and the
--result-file option, if given, specifies the name of the single file to which all output
is written. With --raw, mysqlbinlog writes one binary output file for each log file
transferred from the server. By default, mysqlbinlog writes the files in the current
directory with the same names as the original log files. To modify the output file names,
use the --result-file option. In conjunction with --raw, the --result-file option value is
treated as a prefix that modifies the output file names.
Suppose that a server currently has binary log files named binlog.000999 and up. If you
use mysqlbinlog --raw to back up the files, the --result-file option produces output file
names as shown in the following table. You can write the files to a specific directory by
beginning the --result-file value with the directory path. If the --result-file value
consists only of a directory name, the value must end with the pathname separator
character. Output files are overwritten if they exist.
+---------------------+----------------------------+
|--result-file Option | Output File Names |
+---------------------+----------------------------+
|--result-file=x | xbinlog.000999 and up |
+---------------------+----------------------------+
|--result-file=/tmp/ | /tmp/binlog.000999 and up |
+---------------------+----------------------------+
|--result-file=/tmp/x | /tmp/xbinlog.000999 and up |
+---------------------+----------------------------+
Example: mysqldump + mysqlbinlog for Backup and Restore.PP The following example describes
a simple scenario that shows how to use mysqldump and mysqlbinlog together to back up a
server's data and binary log, and how to use the backup to restore the server if data loss
occurs. The example assumes that the server is running on host host_name and its first
binary log file is named binlog.000999. Enter each command on a single line.
Use mysqlbinlog to make a continuous backup of the binary log:
mysqlbinlog --read-from-remote-server --host=host_name --raw
--stop-never binlog.000999
Use mysqldump to create a dump file as a snapshot of the server's data. Use
--all-databases, --events, and --routines to back up all data, and --master-data=2 to
include the current binary log coordinates in the dump file.
mysqldump --host=host_name --all-databases --events --routines --master-data=2> dump_file
Execute the mysqldump command periodically to create newer snapshots as desired.
If data loss occurs (for example, if the server crashes), use the most recent dump file to
restore the data:
mysql --host=host_name -u root -p < dump_file
Then use the binary log backup to re-execute events that were written after the
coordinates listed in the dump file. Suppose that the coordinates in the file look like
this:
-- CHANGE MASTER TO MASTER_LOG_FILE='binlog.001002', MASTER_LOG_POS=27284;
If the most recent backed-up log file is named binlog.001004, re-execute the log events
like this:
mysqlbinlog --start-position=27284 binlog.001002 binlog.001003 binlog.001004
| mysql --host=host_name -u root -p
You might find it easier to copy the backup files (dump file and binary log files) to the
server host to make it easier to perform the restore operation, or if MySQL does not allow
remote root access.
SPECIFYING THE MYSQLBINLOG SERVER ID
When invoked with the --read-from-remote-server option, mysqlbinlog connects to a MySQL
server, specifies a server ID to identify itself, and requests binary log files from the
server. You can use mysqlbinlog to request log files from a server in several ways:
o Specify an explicitly named set of files: For each file, mysqlbinlog connects and
issues a Binlog dump command. The server sends the file and disconnects. There is one
connection per file.
o Specify the beginning file and --to-last-log: mysqlbinlog connects and issues a Binlog
dump command for all files. The server sends all files and disconnects.
o Specify the beginning file and --stop-never (which implies --to-last-log): mysqlbinlog
connects and issues a Binlog dump command for all files. The server sends all files,
but does not disconnect after sending the last one.
With --read-from-remote-server only, mysqlbinlog connects using a server ID of 0, which
tells the server to disconnect after sending the last requested log file.
With --read-from-remote-server and --stop-never, mysqlbinlog connects using a nonzero
server ID, so the server does not disconnect after sending the last log file. The server
ID is 65535 by default, but this can be changed with --stop-never-slave-server-id.
Thus, for the first two ways of requesting files, the server disconnects because
mysqlbinlog specifies a server ID of 0. It does not disconnect if --stop-never is given
because mysqlbinlog specifies a nonzero server ID.
COPYRIGHT
Copyright (C) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
This documentation is free software; you can redistribute it and/or modify it only under
the terms of the GNU General Public License as published by the Free Software Foundation;
version 2 of the License.
This documentation is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with the program;
if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.
NOTES
1. MySQL Internals: The Binary Log
http://dev.mysql.com/doc/internals/en/binary-log.html
SEE ALSO
For more information, please refer to the MySQL Reference Manual, which may already be
installed locally and which is also available online at http://dev.mysql.com/doc/.
AUTHOR
Oracle Corporation (http://dev.mysql.com/).
MySQL 5.7 06/07/2018 MYSQLBINLOG(1)
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