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Listing 2 Queries to monitor database mirroring
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-- Basic info about mirrored databases SELECT DB_NAME(database_id) AS 'database_name', * FROM sys.database_mirroring WHERE database_id > 4 -- eliminate system databases AND mirroring_state != NULL -- Check mirroring endpoints SELECT * FROM sys.database_mirroring_endpoints -- Check witness status SELECT * FROM sys.database_mirroring_witnesses -- Check mirroring connections SELECT * FROM sys.dm_db_mirroring_connections -- Check auto page repair history (SQL 2008 only) SELECT DB_NAME(database_id) AS 'database_name', * FROM sys.dm_db_mirroring_auto_page_repair
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How do you prepare the mirror
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You should not rely on the status message in the Object Explorer tree in SSMS to tell you the status of your database mirror, because it does not auto refresh. If you do not manually refresh the database status in Object Explorer, you will never know the true status of the database mirroring session. This will give you a false sense of security and well-being, because the status might say Principal, Synchronized, even if the true status is something else like Principal, Suspended (unless you manually refresh it). Perhaps a future version of SQL Server will have a feature that would let you configure SSMS to let it automatically refresh this status periodically. In the meantime, you can use Database Mirroring Monitor to configure alerts that can automatically notify you about the status of your database mirror. You can also query sys.databases and check the log_reuse_wait_desc column to see if the description is DATABASE_ MIRRORING (which tells you that mirroring has a problem), as you see below:
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-- Get log reuse wait description SELECT [name], log_reuse_wait_desc FROM sys.databases
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If a problem with your database mirroring session is preventing the transaction log from being truncated internally when you take a transaction log backup, the transaction log on the principal database will start to fill up and eventually grow (if auto-grow is enabled). This is usually caused by a communications problem or a REDO queue on the mirror. One final tip about establishing your first database mirroring session on a production server is to try creating a small test database on the principal for a trial run on that server. Create an empty database running FULL recovery model, then take a full backup and log backup (even though it is empty, with no activity). Then restore the full backup and log backup, with no recovery. Finally, create the endpoints and alter the database to create the mirror. This should take you less than five minutes, and it will validate connectivity and security for all of the servers and instances involved. It will also validate that you are performing all of the tasks correctly, in the right sequence, before you try it on your production database. This tip is also useful for troubleshooting if you run into problems later on a production server. One last thing you need to take care of is to talk to your developers about how and where they store their application-level connection strings, and what data access technologies they are using to connect to your database. With most data access technologies, you will be able to use transparent client redirect, by adding a failover partner to the connection string. This will allow clients to automatically connect to the server that is acting as the principal before and after a failover, whether it is automatic or manual. This modified connection string should be in place before you attempt a database failover. If the modified connection string is not available, implicit client redirection will usually work, but explicit client redirection is a better choice. If you ever need or want to remove mirroring from the database, you should remove the failover partner information from the connection strings for that database. Now you have mirroring set up and running well, with no performance issues. What superhero functions can you perform with database mirroring
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