The cpu_usage field is a JSON-formatted, key:value string that identifies, for each resource group, the per-segment CPU usage percentage. The key is segment id, the value is the percentage of CPU usage by the resource group on the segment host. The total CPU usage of all segments running on a segment host should not exceed the gp_resource_group_cpu_limit. Example cpu_usage column output:

{"-1":0.01, "0":0.31, "1":0.31}

The memory_usage field is also a JSON-formatted, key:value string. The string contents differ depending upon the type of resource group. For each resource group that you assign to a role (default memory auditor vmtracker), this string identifies the used, available, granted, and proposed fixed and shared memory quota allocations on each segment. The key is segment id. The values are memory values displayed in MB units. The following example shows memory_usage column output for a single segment for a resource group that you assign to a role:

"0":{"used":0, "available":76, "quota_used":-1, "quota_available":60, "quota_granted":60, "quota_proposed":60, "shared_used":0, "shared_available":16, "shared_granted":16, "shared_proposed":16}

For each resource group that you assign to an external component, the memory_usage JSON-formatted string identifies the memory used and the memory limit on each segment. The following example shows memory_usage column output for an external component resource group for a single segment:

"1":{"used":11, "limit_granted":15}