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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.
| Column | Type | Description |
|---|---|---|
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. |
Parent topic: The gpperfmon Database
