ob_plan_cache_evict_high_percentage

Description

ob_plan_cache_evict_high_percentage specifies the percentage of the absolute value of the plan cache memory upper limit that triggers plan cache eviction.

Privilege requirements

• Query variables

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

• Modify variables

  • sys tenants 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.

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

Attributes

Usage notes

The memory size (high water mark) that triggers plan cache eviction = absolute value of the plan cache memory upper limit * ob_plan_cache_evict_high_percentage/100. For more information about the absolute value of the plan cache memory upper limit, see ob_plan_cache_percentage.

Examples

Set the percentage of the absolute value of the plan cache memory upper limit that triggers plan cache eviction to 90.

obclient> SET GLOBAL ob_plan_cache_evict_high_percentage =90;