ob_enable_aggregation_pushdown

Description

ob_enable_aggregation_pushdown specifies whether to enable pushing down aggregation operations.

Privilege requirements

• Query variables

  • Global level

    You 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) in the sys tenant or a user tenant to view the value of the global system variable.

  • Session level

    You 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) in the sys tenant or a user tenant to view the value of the session system variable.

• Modify variables

  • Global level

    • The sys tenant can directly modify the value of global system variables.

    • In MySQL mode, a MySQL user tenant must have the SUPER or ALTER SYSTEM privilege to modify the value of global system variables.

    • In Oracle mode, an Oracle user tenant must have the ALTER SYSTEM privilege to modify the value of global system variables.

  • Session level

    You can directly modify the value of the session system variable in your own tenant.

Attributes

Examples

Enable pushing down aggregation operations.

• Session level

  obclient> SET ob_enable_aggregation_pushdown =1;
  

• Global level

  obclient> SET GLOBAL ob_enable_aggregation_pushdown =1;