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MySQL 5.6 Reference Manual  /  ...  /  How Servers Evaluate Replication Filtering Rules

17.2.3 How Servers Evaluate Replication Filtering Rules

If a replication source server does not write a statement to its binary log, the statement is not replicated. If the server does log the statement, the statement is sent to all replicas and each replica determines whether to execute it or ignore it.

On the source, you can control which databases to log changes for by using the --binlog-do-db and --binlog-ignore-db options to control binary logging. For a description of the rules that servers use in evaluating these options, see Section 17.2.3.1, “Evaluation of Database-Level Replication and Binary Logging Options”. You should not use these options to control which databases and tables are replicated. Instead, use filtering on the replica to control the events that are executed on the replica.

On the replica side, decisions about whether to execute or ignore statements received from the source are made according to the --replicate-* options that the replica was started with. (See Section 17.1.4, “Replication and Binary Logging Options and Variables”.)

In the simplest case, when there are no --replicate-* options, the replica executes all statements that it receives from the source. Otherwise, the result depends on the particular options given.

Database-level options (--replicate-do-db, --replicate-ignore-db) are checked first; see Section 17.2.3.1, “Evaluation of Database-Level Replication and Binary Logging Options”, for a description of this process. If no database-level options are used, option checking proceeds to any table-level options that may be in use (see Section 17.2.3.2, “Evaluation of Table-Level Replication Options”, for a discussion of these). If one or more database-level options are used but none are matched, the statement is not replicated.

For statements affecting databases only (that is, CREATE DATABASE, DROP DATABASE, and ALTER DATABASE), database-level options always take precedence over any --replicate-wild-do-table options. In other words, for such statements, --replicate-wild-do-table options are checked if and only if there are no database-level options that apply. This is a change in behavior from previous versions of MySQL, where the statement CREATE DATABASE dbx was not replicated if the replica had been started with --replicate-do-db=dbx --replicate-wild-do-table=db%.t1. (Bug #46110)

To make it easier to determine what effect an option set has, it is recommended that you avoid mixing *-do-* and *-ignore-* options, or wildcard options with options that do not employ wildcards.

If any --replicate-rewrite-db options were specified, they are applied before the --replicate-* filtering rules are tested.

Note

In MySQL 5.6, all replication filtering options follow the same rules for case sensitivity that apply to names of databases and tables elsewhere in the MySQL server, including the effects of the lower_case_table_names system variable.

This is a change from previous versions of MySQL. (Bug #51639)