ob_route_policy

Description

The ob_route_policy variable specifies the routing strategy for the OBServer node to select a data replica.

Privilege requirements

• Query variables

  • Global level

    The sys tenant and all user tenants can execute the SHOW VARIABLES statement or the SYS.TENANT_VIRTUAL_GLOBAL_VARIABLE view (in Oracle mode) or the information_schema.GLOBAL_VARIABLES view (in MySQL mode) to query the value of a global system variable.

  • Session level

    The sys tenant and all user tenants can execute the SHOW VARIABLES statement or the SYS.TENANT_VIRTUAL_SESSION_VARIABLE view (in Oracle mode) or the information_schema.SESSION_VARIABLES view (in MySQL mode) to query the value of a session system variable.

• Modify variables

  • Set the variable at the global level

    • The sys tenant can directly modify the value of a global system variable.

    • MySQL user tenants must have the SUPER or ALTER SYSTEM privilege to modify the value of a global system variable.

    • Oracle user tenants must have the ALTER SYSTEM privilege to modify the value of a global system variable.

  • Set the variable at the session level

    The sys tenant and all user tenants can directly modify the value of a session system variable in the current tenant.

Attribute descriptions

Examples

Set the routing policy for selecting data replicas inside the OBServer node to prioritize the Zone where the read-only replica is located.

• Set the variable at the session level

  obclient> SET ob_route_policy = 'READONLY_ZONE_FIRST';
  

  or

  obclient> SET ob_route_policy = 1;
  

• Set the variable at the global level

  obclient> SET GLOBAL ob_route_policy = 'READONLY_ZONE_FIRST';
  

  or

  obclient> SET GLOBAL ob_route_policy = 1;
  

References

SQL routing