Administer Default Resource Pools

Set the Default Resource Pool for a User

The default resource pool of a user is the resource_pool value that will be set when a user first connects to SingleStore Helios server. You can set this value when you create a user, or modify this value later. To set this value when creating a user, use the following syntax:

SQL

CREATE USER general_user WITH DEFAULT RESOURCE POOL = general;

Run the SHOW USERS command to see the default pool assigned to each user.

SQL

SHOW USERS;

+--------------------+--------+-------------+------------+-----------------------+
| User               | Type   | Connections | Is deleted | Default resource pool |
+--------------------+--------+-------------+------------+-----------------------+
| 'general_user'@'%' | Native |           0 |            | general               |
| 'root'@'%'         | Native |           1 |            |                       |
+--------------------+--------+-------------+------------+-----------------------+

If the default resource pool is not explicitly set for the user, the default resource pool for that user is the pool set by the command SET GLOBAL resource_pool = foo, or default_pool if the session variable is not set globally. The default resource pool information is also in the information schema table.

SQL

SELECT * FROM INFORMATION_SCHEMA.USERS;

+--------------+------+-------------+------------+---------------------+-----------------------+
| USER         | HOST | CONNECTIONS | IS_DELETED | LAST_UPDATED        | DEFAULT_RESOURCE_POOL |
+--------------+------+-------------+------------+---------------------+-----------------------+
| root         | %    |           1 |          0 | 2018-06-29 11:51:51 |                       |
| general_user | %    |           0 |          0 | 2018-06-29 11:54:38 | general               |
+--------------+------+-------------+------------+---------------------+-----------------------+

You can also change the default pool of a user using the ALTER USER command. For more information, see ALTER USER.

Change the Default Resource Pool for a User

You can change the default pool of an existing user with the ALTER USER command.

Execute the SHOW USERS command to view default the resource pools assigned to each user.

SQL

SHOW USERS;

+-------------+--------+-------------+------------+-----------------------+----------+
| User        | Type   | Connections | Is deleted | Default resource pool | Is local |
+-------------+--------+-------------+------------+-----------------------+----------+
| 'root'@'%'  | Native |           2 |            |                       | LOCAL    |
| 'rw'@'%'    | Native |           0 |            |                       | LOCAL    |
| 'view'@'%'  | Native |           0 |            |                       | LOCAL    |
| 'write'@'%' | Native |           0 |            |                       | LOCAL    |
+-------------+--------+-------------+------------+-----------------------+----------+

Create a resource pool.

SQL

CREATE RESOURCE POOL limReg WITH MEMORY_PERCENTAGE = 50, QUERY_TIMEOUT = 10, MAX_QUEUE_DEPTH = 5, MAX_CONCURRENCY = 5;

Run SHOW RESOURCE POOLS to view the list of available resource pools.

SQL

SHOW RESOURCE POOLS;

+-----------------------+-------------------+---------------+-----------------+---------------------------+---------------------------+-----------------+
| Pool_Name             | Memory_Percentage | Query_Timeout | Max_Concurrency | Soft_CPU_Limit_Percentage | Hard_CPU_Limit_Percentage | Max_Queue_Depth |
+-----------------------+-------------------+---------------+-----------------+---------------------------+---------------------------+-----------------+
| default_pool          |               100 |          NULL |            NULL |                      NULL |                      NULL |            NULL |
| system_auto           |               100 |          NULL |            NULL |                      NULL |                      NULL |            NULL |
| system_optimizer_pool |               100 |          NULL |            NULL |                         5 |                      NULL |            NULL |
| limReg                |                50 |            10 |               5 |                      NULL |                      NULL |               5 |
+-----------------------+-------------------+---------------+-----------------+---------------------------+---------------------------+-----------------+

Use the ALTER USER command to change the default resource pool for the 'rw'@'%' user.

SQL

ALTER USER 'rw'@'%' SET DEFAULT RESOURCE POOL = limReg;

SQL

SHOW USERS;

+-------------+--------+-------------+------------+-----------------------+----------+
| User        | Type   | Connections | Is deleted | Default resource pool | Is local |
+-------------+--------+-------------+------------+-----------------------+----------+
| 'root'@'%'  | Native |           1 |            |                       | LOCAL    |
| 'rw'@'%'    | Native |           0 |            | limReg                | LOCAL    |
| 'view'@'%'  | Native |           0 |            |                       | LOCAL    |
| 'write'@'%' | Native |           0 |            |                       | LOCAL    |
+-------------+--------+-------------+------------+-----------------------+----------+

User Privileges and Resource Pools

Users can view the available resource pools and their status as per the granted permissions. By default, users can access the following resource pools:

Built-in resource pools system_optimizer_pool, default_pool, and system_auto.
The default resource pool set for the user when the user is created.
SQL
```
CREATE USER general_user WITH DEFAULT RESOURCE POOL = general;
```
All available resource pools, if the user has SUPER permission.

Permissions for additional resource pools can be given using GRANT as follows:

SQL

GRANT USAGE ON RESOURCE POOL <resource_pool_name> to '<user_name>'@'%';

Use `*` to grant permissions on all resource pools, even if the user does not have the SUPER permission:

SQL

GRANT USAGE ON RESOURCE POOL * to '<user_name>'@'%';