setUserWriteBlockMode

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Definition

Compatibility
Syntax
Command Fields
Required Access
Example

Definition

setUserWriteBlockMode

New in version 6.0.

The setUserWriteBlockMode command blocks and unblocks writes to the entire cluster.

During cluster-to-cluster sync, mongosync, the cluster-to-cluster synchronization tool, uses the setUserWriteBlockMode command to block writes on the destination cluster. For more information, see the HTTP API start command.

Note

Users and applications with the bypassWriteBlockingMode privilege can bypass the block and continue to perform writes.

Compatibility

This command is available in deployments hosted in the following environments:

MongoDB Enterprise: The subscription-based, self-managed version of MongoDB
MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB

Important

This command is not supported in MongoDB Atlas clusters. For information on Atlas support for all commands, see Unsupported Commands.

Syntax

The command has the following syntax:

db.adminCommand(
   {
     setUserWriteBlockMode: 1,
     global: <boolean>
   }
)

Command Fields

The command takes the following fields:

Field	Type	Description
`setUserWriteBlockMode`	integer	Set this field to `1`.
`global`	boolean	Blocks writes on a cluster when set to `true`. To enable writes on a cluster, set `global: false`.

Required Access

To execute the setUserWriteBlockMode command, the user must have the setUserWriteBlockMode privilege.

Example

Enable user write block mode:
```
db.adminCommand( {
   setUserWriteBlockMode: 1,
   global: true
} )
```
Add a record to the collection:
```
db.names.insertOne( { name: "George Washington Cable" } )
```
The server blocks the write because the user write block is enabled.
Example Output:
```
MongoServerError: User writes blocked
```
Disable user write block mode:
```
db.adminCommand( {
   setUserWriteBlockMode: 1,
   global: false
} )
```
Add a record to the collection:
```
db.names.insertOne( { name: "George Washington Cable" } )
```
The insertOne() method writes to a collection. The server allows the write because the user write block is disabled.

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