A newer version of this documentation is available. Use the version menu above to view the most up-to-date release of the Greenplum 4.x documentation.
The memory_info view shows per-host memory information from the system_history and segment_history tables. This allows administrators to compare the total memory available on a segment host, total memory used on a segment host, and dynamic memory used by query processes.
|ctime||timestamp(0) without time zone||Time this row was created in the segment_history table.|
|hostname||varchar(64)||Segment or master hostname associated with these system memory metrics.|
|mem_total_mb||numeric||Total system memory in MB for this segment host.|
|mem_used_mb||numeric||Total system memory used in MB for this segment host.|
|mem_actual_used_mb||numeric||Actual system memory used in MB for this segment host.|
|mem_actual_free_mb||numeric||Actual system memory free in MB for this segment host.|
|swap_total_mb||numeric||Total swap space in MB for this segment host.|
|swap_used_mb||numeric||Total swap space used in MB for this segment host.|
|dynamic_memory_used_mb||numeric||The amount of dynamic memory in MB allocated to query processes running on this segment.|
|dynamic_memory_available_mb||numeric||The amount of additional dynamic memory (in MB) available to the query processes running on this segment host. Note that this value is a sum of the available memory for all segments on a host. Even though this value reports available memory, it is possible that one or more segments on the host have exceeded their memory limit as set by the gp_vmem_protect_limit parameter.|