parallel_degree_policy

Description

The parallel_degree_policy option specifies the parallelism selection strategy.

Privilege requirements

• Query variables

  • Global level

    sys tenants and user tenants can view the value of a Global system variable by executing the SHOW VARIABLES statement or querying the view SYS.TENANT_VIRTUAL_GLOBAL_VARIABLE (Oracle mode) or the information_schema.GLOBAL_VARIABLES view (MySQL mode).

  • Session level

    sys tenants and user tenants can view the value of a Session system variable by executing the SHOW VARIABLES statement or querying the view SYS.TENANT_VIRTUAL_SESSION_VARIABLE (Oracle mode) or the information_schema.SESSION_VARIABLES view (MySQL mode).

• Modify variables

  • Global level

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

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

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

  • Session level

    sys tenants and user tenants can modify the value of a Session system variable.

Attributes

Examples

Disable the Auto DOP strategy.

• Session level

  obclient> SET parallel_degree_policy = manual;
  

• Global level

  obclient> SET GLOBAL parallel_degree_policy = manual;