| 123456 |
- Field | Value | Description
- ------------------------------------|------------|-------------------------------------
- `SIZE` | `text` | The size of the replica. For valid sizes, see [Size](/sql/create-cluster-replica#size).
- `AVAILABILITY ZONE` | `text` | The availability zone of the underlying cloud provider in which to provision the replica. You must specify an [AWS availability zone ID](https://docs.aws.amazon.com/ram/latest/userguide/working-with-az-ids.html) in either `us-east-1`, `eu-west-1`, or `us-west-2`, e.g. `use1-az1`. Note that you must use the zone's ID, not its name.
- `INTROSPECTION INTERVAL` | `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` | Whether to introspect the gathering of the introspection data.<br>Default: `FALSE`
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