System Resource Consumption Parameters

System Resource Consumption Parameters

These parameters set the limits for system resources consumed by Greenplum Database.

Memory Consumption Parameters

Free Space Map Parameters

These parameters control the sizing of the free space map, which contains expired rows. Use VACUUM to reclaim the free space map disk space.

max_fsm_pages

max_fsm_relations

 

Cost-Based Vacuum Delay Parameters

Warning: Pivotal does not recommend cost-based vacuum delay because it runs asynchronously anong the segment instances. The vacuum cost limit and delay is invoked at the segment level without taking into account the state of the entire Greenplum array

You can configure the execution cost of VACUUM and ANALYZE commands to reduce the I/O impact on concurrent database activity. When the accumulated cost of I/O operations reaches the limit, the process performing the operation sleeps for a while, Then resets the counter and continues execution

vacuum_cost_delay

vacuum_cost_limit

vacuum_cost_page_dirty

vacuum_cost_page_hit

vacuum_cost_page_miss

Transaction ID Management Parameters