sh.enableSharding()
On this page
Definition
sh.enableSharding(database, primaryShard)Note
Changed in version 6.0.
Starting in MongoDB 6.0, this method is not required to shard a collection.
Explicitly creates a database. Use the
mongoshmethodsh.shardCollection()to shard collections on the database. Themongoshmethodsh.enableSharding()wraps theenableShardingcommand.Important
mongosh Method
This page documents a
mongoshmethod. This is not the documentation for database commands or language-specific drivers, such as Node.js.For the database command, see the
enableShardingcommand.For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.
For the legacy
mongoshell documentation, refer to the documentation for the corresponding MongoDB Server release:
Syntax
The sh.enableSharding() has the following form:
sh.enableSharding( <database>, <primary shard> // Optional. Available starting in MongoDB 4.2.2 (and 4.0.14) )
Parameter
The sh.enableSharding() method takes the following parameter:
Parameter | Type | Description |
|---|---|---|
String | The name of the database you want to create. | |
String | Optional. The primary shard for the database; the primary shard contains the unsharded collection for this database. In general, rather than explicitly specifying the primary shard, it is recommended to let the balancer select the primary shard instead. WarningTipIn general, you should not need to specify the primary shard. Allow the balancer to select the primary shard instead. Available starting in MongoDB 4.2.2 (and 4.0.14) |
Behavior
Write Concern
mongos uses
"majority" for the
enableSharding command and its helper
sh.enableSharding().
Primary Shard
In general, you should not need to specify the primaryShard in the command. Instead, allow the balancer to select the primary shard.
However, if you do specify the primary shard for a database and the database
is already enabled for sharding with a different primary shard, the
operation returns an error and the primary shard for the database
remains as before. To change the primary shard for a database, use the
movePrimary command instead.
Example
The following example, run from a mongos, explicitly
creates the shardTest database:
sh.enableSharding("shardTest")
To verify, run sh.status().