parallel_degree_limit

Description

parallel_degree_limit specifies the maximum degree of parallelism allowed when the Auto DOP strategy is used.

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 obtain the value of a Global system variable.

  • 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 obtain the value of a Session system variable.

• Modify variables

  • Global level

    • sys tenants can 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 level

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

Attributes

Examples

Set the maximum degree of parallelism allowed when the Auto DOP strategy is used to 256.

• Global level

  obclient> SET GLOBAL parallel_degree_limit=256;
  

• Session level

  obclient> SET parallel_degree_limit=256;