Restoring a Publisher Database in SQL Server
4) One important thing to do before restoring a publisher database is to verify if the database is enabled for the sync with backup option. If this option is set to true, the distribution database will only contain transactions that are backed up on the publisher database. This also means that we wouldn’t encounter the error messages that we saw earlier when we restored a publisher database blindly. The reason we saw the errors earlier was because the sync with backup option was disabled for the publisher database, and after this was restored, the distribution database was not in sync with the publication. Use the below command for checking the status of this option -: 0-disabled, 1-enabled.
select DATABASEPROPERTYEX (‘databasename’,'IsSyncWithBackup’)
5) Now, restore the publisher database. While restoring a publisher database with the sync with backup option enabled, ensure that you restore the latest full backup and the entire ensuing transaction log backup. This will help us keep the publisher and the distribution databases in sync after the restore.
6) After you have restored the database, it is important to verify the settings of the database. For this, you run sp_helpdb as in step (1) to see if the database settings remain the same.
7) One of the best uses of the Replication Monitor is for checking synchronization, see below:
After performing this we will be shown the below pop up window:
Here, we see the Undistributed Commands tab which gives the number of undistributed commands in the distribution database waiting to be applied on the subscriber database. The Publisher To Distributor History and Distributor To Subscriber History tabs contain synchronization details between publisher-distributor and distributor-subscriber. This helps to analyze the status of our restore operation.
If the sync with backup option was disabled, you will have encountered the error messages which we saw earlier while restoring the database blindly and you will have to run the sp_replrestart procedure on the publication database.
One common misconception is about the ‘preserve the replication settings’ option which can be used while restoring. This does not safeguard a replication setup from failing. This is to be used if we are restoring the replication database on another server, with this option we could retain the replication settings.
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