> For the complete documentation index, see [llms.txt](https://upsolver.gitbook.io/content/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://upsolver.gitbook.io/content/reference-1/sql-commands/clusters.md).

# Clusters

Clusters describe the physical resources upon which Upsolver runs. In Upsolver, you can create compute and query clusters.

## Cluster commands

* [CREATE CLUSTER](/content/reference-1/sql-commands/clusters/create-cluster.md)
* [ALTER CLUSTER](/content/reference-1/sql-commands/clusters/alter-cluster.md)
* [ROLL CLUSTER](/content/reference-1/sql-commands/clusters/roll-cluster.md)
* [STOP/START CLUSTER](/content/reference-1/sql-commands/clusters/stop-start-cluster.md)
* [DROP CLUSTER](/content/reference-1/sql-commands/clusters/drop-cluster.md)

## Cluster statuses

A cluster can be in one of the following statues:

<table><thead><tr><th width="182">Status</th><th>Description</th></tr></thead><tbody><tr><td>Running</td><td>The cluster is running without issues.</td></tr><tr><td>Stopped</td><td>The cluster has been stopped. All entities configured to run on the cluster are impacted. Note that pausing the cluster for a period longer than the source retention period can lead to data loss.</td></tr><tr><td>Warnings</td><td><p>You will see a warning if your cluster meets one of the following conditions: </p><ul><li>The cluster’s utilization percent is above 70%.</li><li>The cluster crashed at least once within the last 12 hours.</li><li>The percentage of reload from disk is greater than 30%.</li></ul></td></tr><tr><td>Critical</td><td><p></p><p>You will see a critical warning if your cluster meets one of the following conditions: </p><ul><li>The cluster’s utilization percent is above 90%.</li><li>The cluster crashed more than 3 times within the last half an hour.</li><li>The percentage of reload from disk is greater than 200%.</li><li>The cluster’s memory load index (%garbage collection) is over 10%.</li></ul></td></tr></tbody></table>


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