--log-bin[=base_name]

Enable binary logging. The server logs all statements that change data to the binary log, which is used for backup and replication. See Section 5.2.3, “The Binary Log”.

The option value, if given, is the basename for the log sequence. The server creates binary log files in sequence by adding a numeric suffix to the basename. It is recommended that you specify a basename (see Additional Known Issues, for the reason). Otherwise, MySQL uses host_name-bin as the basename.

--log-bin-index[=file_name]

The index file for binary log file names. See Section 5.2.3, “The Binary Log”. If you omit the file name, and if you did not specify one with --log-bin, MySQL uses host_name-bin.index as the file name.

--log-bin-trust-function-creators[={0|1}]

This option sets the corresponding log_bin_trust_function_creators system variable. If no argument is given, the option sets the variable to 1. log_bin_trust_function_creators affects how MySQL enforces restrictions on stored function and trigger creation. See Section 18.5, “Binary Logging of Stored Programs”.

This option was added in MySQL 5.0.16.

--log-bin-trust-routine-creators[={0|1}]

This is the old name for --log-bin-trust-function-creators. Before MySQL 5.0.16, it also applies to stored procedures, not just stored functions and sets the log_bin_trust_routine_creators system variable. As of 5.0.16, this option is deprecated. It is recognized for backward compatibility but its use results in a warning.

This option was added in MySQL 5.0.6.

--binlog-do-db=db_name

This option affects binary logging in a manner similar to the way that --replicate-do-db affects replication.

Tell the server to restrict binary logging to updates for which the default database is db_name (that is, the database selected by USE). All other databases that are not explicitly mentioned are ignored. If you use this option, you should ensure that you do updates only in the default database.

There is an exception to this for CREATE DATABASE, ALTER DATABASE, and DROP DATABASE statements. The server uses the database named in the statement (not the default database) to decide whether it should log the statement.

An example of what does not work as you might expect: If the server is started with binlog-do-db=sales, and you run USE prices; UPDATE sales.january SET amount=amount+1000;, this statement is not written into the binary log.

--binlog-ignore-db=db_name

This option affects binary logging in a manner similar to the way that --replicate-ignore-db affects replication.

Tell the server to suppress binary logging of updates for which the default database is db_name (that is, the database selected by USE). If you use this option, you should ensure that you do updates only in the default database.

As with the --binlog-do-db option, there is an exception for the CREATE DATABASE, ALTER DATABASE, and DROP DATABASE statements. The server uses the database named in the statement (not the default database) to decide whether it should log the statement.

An example of what does not work as you might expect: If the server is started with binlog-ignore-db=sales, and you run USE prices; UPDATE sales.january SET amount = amount + 1000;, this statement is written into the binary log.

--max-binlog-dump-events=N

This option is used internally by the MySQL test suite for replication testing and debugging.

--sporadic-binlog-dump-fail

This option is used internally by the MySQL test suite for replication testing and debugging.

log_slave_updates

Whether updates received by a slave server from a master server should be logged to the slave's own binary log. Binary logging must be enabled on the slave for this variable to have any effect. See Section 16.1.2.3, “Replication Slave Options and Variables”.

max_binlog_cache_size

If a multiple-statement transaction requires more than this many bytes of memory, the server generates a Multi-statement transaction required more than 'max_binlog_cache_size' bytes of storage error. The minimum value is 4096; the maximum and default values are 4GB on 32-bit platforms and 16 PB (petabytes) on 64-bit platforms.

max_binlog_size

If a write to the binary log causes the current log file size to exceed the value of this variable, the server rotates the binary logs (closes the current file and opens the next one). The minimum value is 4096 bytes. The maximum and default value is 1GB.

A transaction is written in one chunk to the binary log, so it is never split between several binary logs. Therefore, if you have big transactions, you might see binary log files larger than max_binlog_size.

If max_relay_log_size is 0, the value of max_binlog_size applies to relay logs as well.

sync_binlog

If the value of this variable is greater than 0, the MySQL server synchronizes its binary log to disk (using fdatasync()) after every sync_binlog writes to the binary log. There is one write to the binary log per statement if autocommit is enabled, and one write per transaction otherwise. The default value of sync_binlog is 0, which does no synchronizing to disk. A value of 1 is the safest choice because in the event of a crash you lose at most one statement or transaction from the binary log. However, it is also the slowest choice (unless the disk has a battery-backed cache, which makes synchronization very fast).

If the value of sync_binlog is 0 (the default), no extra flushing is done. The server relies on the operating system to flush the file contents occasionally as for any other file.