SELECT Statements

This section discusses how MariaDB replicates CREATE TABLE ... SELECT statements.

MySQL 5.6 does not allow a CREATE TABLE ... SELECT statement to make any changes in tables other than the table that is created by the statement. This is a change in behavior from previous versions of MySQL, which permitted these statements to do so. This means that, when using statement-based replication between a MariaDB 5.6 or later slave and a master running a previous version of MySQL, a CREATE TABLE ... SELECT statement causing changes in other tables on the master fails on the slave, causing replication to stop. To keep this from happening, you should use row-based replication, rewrite the offending statement before running it on the master, or upgrade the master to MariaDB 5.6 (or later). (If you choose to upgrade the master, keep in mind that such a CREATE TABLE ... SELECT statement will fail following the upgrade unless it is rewritten to remove any side effects on other tables.) This is not an issue when using row-based replication, because the statement is logged as a CREATE TABLE statement with any changes to table data logged as row-insert events, rather than as the entire CREATE TABLE ... SELECT.

These behaviors are not dependent on MariaDB version:

• CREATE TABLE ... SELECT always performs an implicit commit (, "Statements That Cause an Implicit Commit").
• If destination table does not exist, logging occurs as follows. It does not matter whether IF NOT EXISTS is present.
  • STATEMENT or MIXED format: The statement is logged as written.
  • ROW format: The statement is logged as a CREATE TABLE statement followed by a series of insert-row events.
• If the statement fails, nothing is logged. This includes the case that the destination table exists and IF NOT EXISTS is not given.

When the destination table exists and IF NOT EXISTS is given, MariaDB handles the statement in a version-dependent way.

In MariaDB 5.1 before 5.1.51 and in MariaDB 5.5 before 5.5.6 (this is the original behavior):

• STATEMENT or MIXED format: The statement is logged as written.
• ROW format: The statement is logged as a CREATE TABLE statement followed by a series of insert-row events.

In MariaDB 5.1 as of 5.1.51:

• STATEMENT or MIXED format: The statement is logged as the equivalent pair of CREATE TABLE and INSERT INTO ... SELECT statements.
• ROW format: The statement is logged as a CREATE TABLE statement followed by a series of insert-row events.

In MariaDB 5.5 as of 5.5.6:

• Nothing is inserted or logged.

These version dependencies arise due to a change in MariaDB 5.5.6 in handling of CREATE TABLE ... SELECT not to insert rows if the destination table already exists, and a change made in MariaDB 5.1.51 to preserve forward compatibility in replication of such statements from a 5.1 master to a 5.5 slave. For details, see , "CREATE TABLE ... SELECT Syntax".

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