PROMOTE AGGREGATOR ... TO MASTER
SingleStore Managed Service does not support this command.
This command promotes a child aggregator node to master, while demoting the current master to child. This is useful for host maintenance that requires a restart of the master aggregator, or replacement of the old master aggregator with new hardware.
PROMOTE AGGREGATOR '<host>':<port> TO MASTER;
<host>is the host of the child aggregator to be promoted.
<port>is the port of the child aggregator to be promoted.
- The node to be promoted must already be a child aggregator in the cluster and must currently be online.
enable_query_forwardingmust be set to
ONfor DDL and DML queries to continue to run while
PROMOTE AGGREGATORexecutes. See List of Engine Variables for more information on this variable.
- If there is permanent loss of the master aggregator, use AGGREGATOR SET AS MASTER instead of
PROMOTE AGGREGATOR ... TO MASTER.
- This command can be run on a master or child aggregator node (see Node Requirements for SingleStore DB Commands).
The specified user account must have full permissions on the node to execute this command, namely the cluster privilege. For more information, see Permissions Matrix.
PROMOTE AGGREGATOR '127.0.0.1':3307 TO MASTER; **** Query OK, 0 rows affected (2.971 sec)