When do we use SQL Server Database in Restricted User Mode?

Why do we need restricted user SQL server?

When performing some maintenance tasks, particularly in recovery situations, it is essential to limit access to databases by general users by restricting the user access by putting into restricted user sql server or for sql database in single user mode after restore. restricted user sql server access mode can be employed to limit connections to high-level users only.

How do we put restricted user SQL server?

In order to put SQL server restricted user mode we need to use the alter database set restricted_user below. This command can help with sql database in single user mode after restore.

ALTER DATABASE Command
The ALTER DATABASE command allows a database administrator to modify SQL Server databases and their files and filegroups. This includes changing the database user access options.

Setting a Database to Restricted User Mode.

The simplest method to set a database into restricted user mode is to use the following statement:

ALTER DATABASE [Database_Name] SET RESTRICTED_USER

The above command alter database set restricted_user immediately prevents new connections being made to the database by users who do not have the appropriate roles assigned. But any user who is already connected is not disconnected automatically.

What if open connections in Restricted user SQL Server?

In this situation, the ALTER DATABASE command is blocked and waits until all such connections are closed. This ensures that no transactions are rolled back unexpectedly by this sql server restricted user mode.

Note: The AUTO_UPDATE_STATISTICS_ASYNC in particular should be checked. If set to ON, the statement will be blocked. Background processes that are running against SQL Server may cause the command sql server restricted user mode to be indefinitely blocked, as can internal processes.

 

Restricted user SQL Server Options Available:

1.Failing Immediately When Blocked: We can execute the statement with the NO_WAIT option. This causes the command SQL server restricted user mode to fail if the database mode cannot be changed immediately. This can be helpful with sql database in single user mode after restore for restricted user sql server database access before letting other general users to access.

ALTER DATABASE [Database_Name] SET RESTRICTED_USER WITH NO_WAIT

2.Forcing Disconnection of Other Users: This options can be used to immediately disconnect users or can be provided with a number of seconds to pause before the disconnection occurs by sql server restricted user mode. To force the immediate disconnection of general users and processes and the rolling back of their transactions mainly if SQL server restricted user after restore is needed, use the following command:

ALTER DATABASE [Database_Name] SET RESTRICTED_USER WITH ROLLBACK IMMEDIATE

We can give a pause windows for transactions to complete for active transactions before we terminate them in SQL server restricted user mode. This is particularly useful for web-based applications as the web site can be stopped with just enough time provided for any active or queued transactions to complete successfully.
The following example statement pauses for five minutes before disconnecting users by restricted user sql server statement mainly when not for SQL server restricted user after restore of a database:

ALTER DATABASE [Database_Name] SET RESTRICTED_USER WITH ROLLBACK AFTER 300 SECONDS


How to remove single user mode in SQL server?

Changing to Multi-User Mode from Restricted user sql server that is to answer the ” how to remove single user mode in sql server ” is just to change to multi user

Now setting database back to multi-user mode from restricted user sql server is done by the opposite of alter database set restricted_user that is alter database set multi user.

To remove single user mode in sql server is achieved with the ALTER DATABASE statement as follows:

ALTER DATABASE [Database_Name] SET MULTI_USER