ob_enable_plan_cache

Description

ob_enable_plan_cache specifies whether to enable the Plan Cache.

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

  • Global

    • 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.

  • Session

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

Attributes

Examples

Enable the plan cache.

• Session level

  obclient> SET ob_enable_plan_cache =1;
  

• Global level

  obclient> SET GLOBAL ob_enable_plan_cache =1;