Criteria the router uses to select Replica Servers in load balancing read operations.
In addition to splitting read and write operations between Primary and Replica Servers, the Read/Write Split router performs load balancing on the available Replica Servers. This module parameter sets the criteria used to select the Servers.
Enum values are case-sensitive.
slave_selection_criteria=LEAST_CURRENT_OPERATIONS is correct while
slave_selection_criteria=least_current_operations is not correct.
Router selects the Replica Server with the least number of connections from MariaDB MaxScale.
Router selects the Replica Server with the least number of connections from this router service.
Router selects the Replica Server with the least replication lag.
Router selects the Replica Server with the fewest active operations.
Router selects the Replica Server based on average response times.