Because GTID-based replication is dependent on transactions, some features otherwise available in MySQL are not supported when using it. This section provides information about restrictions on and limitations of replication with GTIDs.
Updates involving nontransactional storage engines.
When using GTIDs, updates to tables using nontransactional
storage engines such as
cannot be made in the same statement or transaction as updates
to tables using transactional storage engines such as
This restriction is due to the fact that updates to tables that use a nontransactional storage engine mixed with updates to tables that use a transactional storage engine within the same transaction can result in multiple GTIDs being assigned to the same transaction.
Such problems can also occur when the source and the replica use different storage engines for their respective versions of the same table, where one storage engine is transactional and the other is not. Also be aware that triggers that are defined to operate on nontransactional tables can be the cause of these problems.
In any of the cases just mentioned, the one-to-one correspondence between transactions and GTIDs is broken, with the result that GTID-based replication cannot function correctly.
CREATE TABLE ... SELECT statements.
Prior to MySQL 8.0.21,
TABLE ... SELECT statements are not allowed when using
GTID-based replication. When
binlog_format is set to
TABLE ... SELECT statement is recorded in the binary
log as one transaction with one GTID, but if
ROW format is used, the statement is recorded
as two transactions with two GTIDs. If a source used
STATEMENT format and a replica used
ROW format, the replica would be unable to
handle the transaction correctly, therefore the
TABLE ... SELECT statement is disallowed with GTIDs to
prevent this scenario. This restriction is lifted in MySQL
8.0.21 on storage engines that support atomic DDL. In this case,
TABLE ... SELECT is recorded in the binary log as one
transaction. For more information, see
Atomic Data Definition Statement Support.
binlog_format is set to
TABLE statements cannot be used inside transactions,
procedures, functions, and triggers when GTIDs are in use on the
server (that is, when the
variable is set to
ON). They can be used
outside these contexts when GTIDs are in use, provided that
autocommit=1 is set. From MySQL
TABLE statements are allowed inside a transaction,
procedure, function, or trigger when GTIDs are in use. The
statements are not written to the binary log and are therefore
not replicated to replicas. The use of row-based replication
means that the replicas remain in sync without the need to
replicate temporary tables. If the removal of these statements
from a transaction results in an empty transaction, the
transaction is not written to the binary log.
Preventing execution of unsupported statements.
To prevent execution of statements that would cause GTID-based
replication to fail, all servers must be started with the
when enabling GTIDs. This causes statements of any of the types
discussed previously in this section to fail with an error.
takes effect if binary logging takes place for a statement. If
binary logging is disabled on the server, or if statements are not
written to the binary log because they are removed by a filter,
GTID consistency is not checked or enforced for the statements
that are not logged.
For information about other required startup options when enabling GTIDs, see Section 2.3.4, “Setting Up Replication Using GTIDs”.
sql_slave_skip_counter is not
available when using GTID-based replication. If you need to skip
transactions, use the value of the source's
gtid_executed variable instead.
If you have enabled GTID assignment on a replication channel
CHANGE REPLICATION SOURCE
available. For more information, see
Section 2.7.3, “Skipping Transactions”.
The IGNORE_SERVER_IDS option of the
REPLICATION SOURCE TO |
MASTER TO statement is deprecated when using GTIDs,
because transactions that have already been applied are
automatically ignored. Before starting GTID-based replication,
check for and clear all ignored server ID lists that have
previously been set on the servers involved. The
REPLICA | SLAVE STATUS statement, which can be issued
for individual channels, displays the list of ignored server IDs
if there is one. If there is no list, the
Replicate_Ignore_Server_Ids field is blank.
GTID mode and mysql_upgrade.
Prior to MySQL 8.0.16, when the server is running with global
transaction identifiers (GTIDs) enabled
gtid_mode=ON), do not enable
binary logging by mysql_upgrade (the
--write-binlog option). As
of MySQL 8.0.16, the server performs the entire MySQL upgrade
procedure, but disables binary logging during the upgrade, so
there is no issue.