ob_enable_aggregation_pushdown

Description

ob_enable_aggregation_pushdown specifies whether to allow aggregation pushdown.

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) to view the value of a global system variable. This privilege is available to the sys tenant and all user tenants.

  • 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) to view the value of a session system variable. This privilege is available to the sys tenant and all user tenants.

• Modify variables

  • Global level

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

    • A MySQL user tenant must have the SUPER or ALTER SYSTEM privilege to modify the value of a global system variable.

    • An Oracle user tenant must have the ALTER SYSTEM privilege to modify the value of a global system variable.

  • Session level

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

Attributes

Examples

Set the value of ob_enable_aggregation_pushdown to allow aggregation pushdown.

• Session level

  obclient> SET ob_enable_aggregation_pushdown =1;
  

• Global level

  obclient> SET GLOBAL ob_enable_aggregation_pushdown =1;