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- Configuration | Value | Description
- ------------------------------------|------------|------------------------
- `SIZE` <a name="alter-cluster-size"></a> | `text` | The size of the resource allocations for the cluster. Available sizes are: <table> <tbody> <tr> <td> <ul> <li><code>25cc</code></li> <li><code>50cc</code></li> <li><code>100cc</code></li> <li><code>200cc</code></li> <li><code>300cc</code></li> <li><code>400cc</code></li> <li><code>600cc</code></li> <li><code>800cc</code></li> </ul> </td> <td> <ul> <li><code>1200cc</code></li> <li><code>1600cc</code></li> <li><code>3200cc</code></li> <li><code>6400cc</code></li> </ul> </td> <td> <ul> <li><code>128C</code></li> <li><code>256C</code></li> <li><code>512C</code></li> </ul> </td> </tr> </tbody> </table><br><ul><li>Changing the size of a cluster may incur downtime. For more information, see [Resizing considerations](#resizing).</li><li>Not available for `ALTER CLUSTER ... RESET` since there is no default `SIZE` value.</li></ul><br>
- `REPLICATION FACTOR` | `int` | The number of replicas to provision for the cluster. Each replica of the cluster provisions a new pool of compute resources to perform exactly the same computations on exactly the same data. Clusters that contain sources or sinks can only have a replication factor of `0` or `1`. For more information, see [Replication factor considerations](#replication-factor).<br>Default: `1`
- `INTROSPECTION INTERVAL` | [`interval`](/sql/types/interval/) | The interval at which to collect introspection data. See [Troubleshooting](/ops/troubleshooting) for details about introspection data. The special value `0` entirely disables the gathering of introspection data.<br>Default: `1s`
- `INTROSPECTION DEBUGGING` | `bool` | Indicates whether to introspect the gathering of the introspection data.<br>Default: `FALSE`
- `MANAGED` | `bool` | Whether to automatically manage the cluster's replicas based on the configured size and replication factor.<br>If `FALSE`, enables the use of the <em>deprecated</em> [`CREATE CLUSTER REPLICA`](/sql/create-cluster-replica) command.<br>Default: `TRUE`
- `SCHEDULE` | [`MANUAL`,`ON REFRESH`] | The [scheduling type](/sql/create-cluster/#scheduling) for the cluster. <br>Default: `MANUAL`
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