SQL Statements for Controlling Group Replication Replication on this member are removed from memory, and must be supplied when you start Group Replication again. Use this statement with extreme caution because it removes the server instance from the group, meaning it is no longer protected by Group Replication’s consistency guarantee mechanisms. To be completely safe, ensure that your applications can no longer connect to the instance before issuing this statement to avoid any chance of stale reads. The following function enables you to configure which member of a single-primary replication group is the primary. Appoints a specific member of the group as the new primary, overriding any election process. Pass in member_uuid  which is the  server_uuid  of the member that you want to become the new primary. Must be issued on a member of a replication group running in single-primary mode. The following functions enable you to control the mode which a replication group is running in, either single-primary or multi-primary mode. Changes a group running in multi-primary mode to single-primary mode, without the need to stop Group Replication. Must be issued on a member of a replication group running in multi-primary mode. When you change to single-primary mode, strict consistency checks are also disabled on all group members, as required in single-primary mode ( group_replication_enforce_update_everywhere_checks=OFF ). Warning 13.4.3.3 Function which Configures Group Replication Primary • group_replication_set_as_primary() Syntax: Return value: Example: A string containing the result of the operation, for example whether it was successful or not. STRING group_replication_set_as_primary( member_uuid ) SELECT group_replication_set_as_primary( member_uuid ) For more information, see Section 18.5.1.1, “Changing a Group’s Primary Member” 13.4.3.4 Functions which Configure the Group Replication Mode • group_replication_switch_to_single_primary_mode() • str : A string containing the UUID of a member of the group which should become the new single primary. Other members of the group become secondaries. STRING group_replication_switch_to_single_primary_mode([ str ]) Syntax: Arguments: 2786