ob_route_policy

Description

ob_route_policy specifies the routing strategy for selecting data replicas within an OBServer node.

Privilege requirements

• Query variables

  • Global level

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

  • Session level

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

• Modify variables

  • Global level

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

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

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

  • Session level

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

Attributes

Examples

Set the routing strategy for selecting data replicas within an OBServer node to prioritize the zone where the read-only replica is located.

• Session level

  obclient> SET ob_route_policy = 'READONLY_ZONE_FIRST';
  

  or

  obclient> SET ob_route_policy = 1;
  

• Global level

  obclient> SET GLOBAL ob_route_policy = 'READONLY_ZONE_FIRST';
  

  or

  obclient> SET GLOBAL ob_route_policy = 1;
  

References

SQL routing