optimizer_use_sql_plan_baselines

Description

optimizer_use_sql_plan_baselines specifies whether to use the plan baseline.

Privilege requirements

• Query variables

  • Global level

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

  • Session level

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

• 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 optimizer to not use the plan baseline.

• Global level

  obclient> SET GLOBAL optimizer_use_sql_plan_baselines = 0;
  

• Session level

  obclient> SET optimizer_use_sql_plan_baselines = 0;