.alter-merge database policy sharding command
Applies to:✅ Azure Data Explorer
Changes the database sharding policy. Use the sharding policy to manage data sharding for databases and tables.
The sharding policy defines if and how Extents (data shards) in the Azure Data Explorer cluster should be sealed. When a database is created, it contains the default data sharding policy. All tables created in the database inherit this policy unless the policy is explicitly overridden at the table level.
Permissions
You must have at least Database Admin permissions to run this command.
Syntax
.alter-merge database DatabaseName policy sharding ArrayOfPolicyObjects
Learn more about syntax conventions.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
| DatabaseName | string |
✔️ | The name of the database for which to alter the sharding policy. |
| ArrayOfPolicyObjects | string |
✔️ | A serialized array of one or more JSON policy objects. For more information, see sharding policy. |
Returns
Returns a JSON representation of the policy.
Example
The following command changes a single property for the sharding policy for a database:
.alter-merge database MyDatabase policy sharding
@'{ "MaxExtentSizeInMb": 1024}'