DROP RESOURCE GROUP

Removes a resource group.

Synopsis

DROP RESOURCE GROUP <group_name>

Description

This command removes a resource group from LightDB-A Database. Only a superuser can drop a resource group. When you drop a resource group, the memory and CPU resources reserved by the group are returned to LightDB-A Database.

To drop a role resource group, the group cannot be assigned to any roles, nor can it have any statements pending or running in the group. If you drop a resource group that you created for an external component, the behavior is determined by the external component. For example, dropping a resource group that you assigned to a PL/Container runtime stops running containers in the group.

You cannot drop the pre-defined admin_group and default_group resource groups.

Parameters

group_name : The name of the resource group to remove.

Notes

You cannot submit a DROP RESOURCE GROUP command in an explicit transaction or sub-transaction.

Use ALTER ROLE to remove a resource group assigned to a specific user/role.

Perform the following query to view all of the currently active queries for all resource groups:

SELECT usename, query, waiting, pid,
    rsgid, rsgname, rsgqueueduration 
  FROM pg_stat_activity;

To view the resource group assignments, perform the following query on the pg_roles and pg_resgroup system catalog tables:

SELECT rolname, rsgname 
  FROM pg_roles, pg_resgroup
  WHERE pg_roles.rolresgroup=pg_resgroup.oid;

Examples

Remove the resource group assigned to a role. This operation then assigns the default resource group default_group to the role:

ALTER ROLE bob RESOURCE GROUP NONE;

Remove the resource group named adhoc:

DROP RESOURCE GROUP adhoc;

Compatibility

The DROP RESOURCE GROUP statement is a LightDB-A Database extension.