parallel_degree_policy

Description

parallel_degree_policy specifies the parallel degree selection strategy.

Privilege requirements

• Query variables

  • Global level

    sys tenants 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 Global system variables.

  • Session level

    sys tenants 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 Session system variables.

• Modify variables

  • Global level

    • sys tenants can directly modify the value of Global system variables.

    • MySQL user tenants must have the SUPER or ALTER SYSTEM privilege to modify the value of Global system variables.

    • Oracle user tenants must have the ALTER SYSTEM privilege to modify the value of Global system variables.

  • Session level

    sys tenants and all user tenants can directly modify the value of Session system variables.

Attributes

Examples

Disable the Auto DOP strategy.

• Session level

  obclient> SET parallel_degree_policy = manual;
  

• Global level

  obclient> SET GLOBAL parallel_degree_policy = manual;