Syntax:
SET RESOURCE GROUP group_name
    [FOR thread_id [, thread_id] ...]

SET RESOURCE GROUP is used for resource group management (see
https://dev.mysql.com/doc/refman/8.0/en/resource-groups.html). This
statement assigns threads to a resource group. It requires the
RESOURCE_GROUP_ADMIN or RESOURCE_GROUP_USER privilege.

group_name identifies which resource group to be assigned. Any
thread_id values indicate threads to assign to the group. Thread IDs
can be determined from the Performance Schema threads table. If the
resource group or any named thread ID does not exist, an error occurs.

With no FOR clause, the statement assigns the current thread for the
session to the resource group.

With a FOR clause that names thread IDs, the statement assigns those
threads to the resource group.

For attempts to assign a system thread to a user resource group or a
user thread to a system resource group, a warning occurs.

Examples:

o Assign the current session thread to a group:

SET RESOURCE GROUP rg1;

o Assign the named threads to a group:

SET RESOURCE GROUP rg2 FOR 14, 78, 4;

Resource group management is local to the server on which it occurs.
SET RESOURCE GROUP statements are not written to the binary log and are
not replicated.

An alternative to SET RESOURCE GROUP is the RESOURCE_GROUP optimizer
hint, which assigns individual statements to a resource group. See
https://dev.mysql.com/doc/refman/8.0/en/optimizer-hints.html.

URL: https://dev.mysql.com/doc/refman/8.0/en/set-resource-group.html

