parallel_degree_policy

Description

The parallel_degree_policy variable specifies the parallel degree selection strategy.

Privilege requirements

• Query variables

  • Global level

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

• Modify variables

  • Set the variable at the global level

    • 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.

    • For V4.x, Oracle user tenants must have the ALTER SYSTEM privilege to modify the value of a global system variable starting from V4.2.0.

  • Set the variable at the session level

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

Attributes

Examples

set parallel_degree_policy = manual;

set parallel_degree_policy = auto;
set global parallel_degree_policy = manual;
set global parallel_degree_policy = auto;