The default replication format depends on the version of MySQL you are using:

You can force the default replication format by specifying the format type to the --binlog-format=type option. When set, all replication slaves connecting to the server will read the events according to this setting. The supported options are:

The logging format also can be switched at runtime. To specify the format globally for all clients, set the global value of the binlog_format system variable. (To change a global variable you need the SUPER privilege.)

To switch to statement-based format, use either of these statements:

mysql> SET GLOBAL binlog_format = 'STATEMENT';
mysql> SET GLOBAL binlog_format = 1;

To switch to row-based format, use either of these statements:

mysql> SET GLOBAL binlog_format = 'ROW';
mysql> SET GLOBAL binlog_format = 2;

To switch to mixed format, use either of these statements:

mysql> SET GLOBAL binlog_format = 'MIXED';
mysql> SET GLOBAL binlog_format = 3;

Individual clients can control the logging format for their own statements by setting the session value of binlog_format. For example:

mysql> SET SESSION binlog_format = 'STATEMENT';
mysql> SET SESSION binlog_format = 'ROW';
mysql> SET SESSION binlog_format = 'MIXED';

In addition to switching the logging format manually, a slave server may switch the format automatically. This happens when the server is running in either STATEMENT or MIXED format and encounters a row in the binary log that is written in ROW logging format. In that case, the slave switches to row-based replication temporarily for that event, and switches back to the previous format afterwards.

There are two reasons why you might want to set replication logging on a per-connection basis:

There are exceptions when you cannot switch the replication format at runtime:

Trying to switch the format in those cases results in an error.

Switching the replication format at runtime is not recommended when any temporary tables exist, because temporary tables are logged only when using statement-based replication, whereas with row-based replication they are not logged. With mixed replication, temporary tables are usually logged; exceptions happen with user-defined functions (UDF) and with the UUID() function.

With the binlog format set to ROW, many changes are written to the binary log using the row-based format. Some changes, however, still use the statement-based format. Examples include all DDL (data definition language) statements such as CREATE TABLE, ALTER TABLE, or DROP TABLE.

The --binlog-row-event-max-size option is available for servers that are capable of row-based replication. Rows are stored into the binary log in chunks having a size in bytes not exceeding the value of this option. The value must be a multiple of 256. The default value is 1024.