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17.2.1 Replication Formats
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Replication works because events written to the binary log are read from the master and then processed on the slave. The events are recorded within the binary log in different formats according to the type of event. The different replication formats used correspond to the binary logging format used when the events were recorded in the master's binary log. The correlation between binary logging formats and the terms used during replication are:
When using statement-based binary logging, the master writes SQL statements to the binary log. Replication of the master to the slave works by executing the SQL statements on the slave. This is called statement-based replication (which can be abbreviated as SBR), which corresponds to the MySQL statement-based binary logging format.
When using row-based logging, the master writes events to the binary log that indicate how individual table rows are changed. Replication of the master to the slave works by copying the events representing the changes to the table rows to the slave. This is called row-based replication (which can be abbreviated as RBR).
Row-based logging is the default method.
You can also configure MySQL to use a mix of both statement-based and row-based logging, depending on which is most appropriate for the change to be logged. This is called mixed-format logging. When using mixed-format logging, a statement-based log is used by default. Depending on certain statements, and also the storage engine being used, the log is automatically switched to row-based in particular cases. Replication using the mixed format is referred to as mixed-based replication or mixed-format replication. For more information, see Section 5.4.4.3, “Mixed Binary Logging Format”.
NDB Cluster.
The default binary logging format in MySQL NDB Cluster 8.0 is
MIXED. You should note that NDB Cluster
Replication always uses row-based replication, and that the
NDB storage engine is incompatible
with statement-based replication. See
Section 22.6.2, “General Requirements for NDB Cluster Replication”, for more
information.
When using MIXED format, the binary logging
format is determined in part by the storage engine being used and
the statement being executed. For more information on mixed-format
logging and the rules governing the support of different logging
formats, see Section 5.4.4.3, “Mixed Binary Logging Format”.
The logging format in a running MySQL server is controlled by
setting the binlog_format server
system variable. This variable can be set with session or global
scope. The rules governing when and how the new setting takes
effect are the same as for other MySQL server system variables.
Setting the variable for the current session lasts only until the
end of that session, and the change is not visible to other
sessions. Setting the variable globally takes effect for clients
that connect after the change, but not for any current client
sessions, including the session where the variable setting was
changed. To make the global system variable setting permanent so
that it applies across server restarts, you must set it in an
option file. For more information, see
Section 13.7.5.1, “SET Syntax for Variable Assignment”.
There are conditions under which you cannot change the binary logging format at runtime or doing so causes replication to fail. See Section 5.4.4.2, “Setting The Binary Log Format”.
Changing the global binlog_format
value requires privileges sufficient to set global system
variables. Changing the session
binlog_format value requires
privileges sufficient to set restricted session system variables.
See Section 5.1.9.1, “System Variable Privileges”.
The statement-based and row-based replication formats have different issues and limitations. For a comparison of their relative advantages and disadvantages, see Section 17.2.1.1, “Advantages and Disadvantages of Statement-Based and Row-Based Replication”.
With statement-based replication, you may encounter issues with replicating stored routines or triggers. You can avoid these issues by using row-based replication instead. For more information, see Section 24.7, “Stored Program Binary Logging”.
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