Amazon Redshift
Database Developer Guide

WLM Dynamic and Static Configuration Properties

The WLM configuration properties are either dynamic or static. You can apply dynamic properties to the database without a cluster reboot, but static properties require a cluster reboot for changes to take effect. However, if you change dynamic and static properties at the same time, then you must reboot the cluster for all the property changes to take effect. This is true whether the changed properties are dynamic or static.

While dynamic properties are being applied, your cluster status is modifying. Switching between automatic WLM and manual WLM is a static change and requires a cluster reboot to take effect.

The following table indicates which WLM properties are dynamic or static when using automatic WLM or manual WLM.

WLM Property Automatic WLM Manual WLM
Query groups Dynamic Static
Query group wildcard Dynamic Static
User groups Dynamic Static
User group wildcard Dynamic Static
Concurrency on main Not applicable Dynamic
Concurrency Scaling mode Dynamic Dynamic
Enable short query acceleration Not applicable Dynamic
Maximum runtime for short queries Dynamic Dynamic
Percent of memory to use Not applicable Dynamic
Timeout Not applicable Dynamic
Priority Dynamic Not applicable
Adding or removing queues Dynamic Static

Note

When using manual WLM, if the timeout value is changed, the new value is applied to any query that begins running after the value is changed. If the concurrency or percent of memory to use are changed, Amazon Redshift changes to the new configuration dynamically. Thus, currently running queries aren't affected by the change. For more information, see WLM Dynamic Memory Allocation.

When using automatic WLM, timeout is ignored.