Replication and Binary Logging Options and Variables value and there are multiple replication channels configured, the  START REPLICA | SLAVE  statement can only be used with the  FOR CHANNEL  channel  clause. This option is incompatible with GTID-based replication, and must not be set to a nonzero value when gtid_mode=ON  is set. If you need to skip transactions when employing GTIDs, use  gtid_executed from the source instead. If you have enabled GTID assignment on a replication channel using the ASSIGN_GTIDS_TO_ANONYMOUS_TRANSACTIONS  option of the  CHANGE REPLICATION SOURCE TO statement,  sql_slave_skip_counter  is available. See Section 17.1.7.3, “Skipping Transactions” . Important If skipping the number of events specified by setting this variable would cause the replica to begin in the middle of an event group, the replica continues to skip until it finds the beginning of the next event group and begins from that point. For more information, see Section 17.1.7.3, “Skipping Transactions” . • sync_master_info Command-Line Format --sync-master-info=# System Variable sync_master_info Scope Global Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 10000 Minimum Value 0 Maximum Value 4294967295 The number of events after which the replica updates the connection metadata repository. When the connection metadata repository is stored as an  InnoDB  table, which is the default from MySQL 8.0, it is updated after this number of events. If the connection metadata repository is stored as a file, which is deprecated from MySQL 8.0, the replica synchronizes its  master.info  file to disk (using fdatasync() ) after this number of events. The default value is 10000, and a zero value means that the repository is never updated. Setting this variable takes effect for all replication channels immediately, including running channels. • sync_relay_log Command-Line Format --sync-relay-log=# System Variable sync_relay_log Scope Global Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 10000 Minimum Value 0 3539