Log Shipping In Sql Server 2005

Log Shipping In Sql Server 2005 – Recent releases of SQL Server have focused on high availability A pre-release preview of the next release of SQL Server, named Denali (SQL Server 2012), shows that this trend will continue. Somewhere between new accessibility technologies and feature sets, log shipping seems to have taken a backseat. While log shipping received a much-needed facelift in SQL Server 2005, only minor improvements were made in SQL Server 2008.

Although log shipping is not as widely used as it once was, it is still an important tool that has many applications, such as using hot spares for disaster recovery, migrating large databases, and providing read-only access to data. Log shipping is not difficult to understand and use There are three methods that can save you a lot of time and make log shipping painless: reverse log shipping, switching between log shipping and database mirroring, and converting log shipping to transactional replication.

Log Shipping In Sql Server 2005

Log Shipping In Sql Server 2005

Magazine return shipping is often overlooked When DBAs need to switch to a secondary log shipping server, they usually think about log shipping recovery afterward. This is especially true for very large databases If you are using log shipping as your primary disaster recovery solution and need to switch to a secondary log shipping server, you should start log shipping as soon as possible. Without disaster recovery, you may be operating insecurely

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Reversing log shipping is very simple A complete backup does not require re-starting the database if done carefully However, it is important to remember the following:

Log Shipping In Sql Server 2005

Note that steps 7 and 8 are listed as optional because they are not required to arrange log shipping. However, I recommend that you follow these steps to ensure your log shipping setup goes smoothly.

With minor modifications, this 10-step process works with multiple log shipping secondary databases. You follow the same basic steps, keeping in mind that the secondary will remain after the other secondary database fails. After you create a log backup for the new primary database, use the NORECOVERY option to restore that backup to the specified secondary database. You can then add them to the new primary database as secondary databases

Log Shipping In Sql Server 2005

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Log shipping and database mirroring start with a full backup, and both use LSN chains for synchronization. This similarity allows you to switch between them without having to re-initialize with a full backup This method is useful when you have log shipping or database mirroring configured and want to switch to a different technology for a short period of time. The switch can go either way For example, I use this method when I need to perform maintenance on a log shipping server

Switching between log shipping and database mirroring does not require manual database backups or restores. It’s as simple as dropping one of the configured technologies and then setting the other However, the key concept to remember is that you need to prevent backups from being created if no technology is configured.

Log Shipping In Sql Server 2005

For short-term failovers, I recommend switching between log shipping and database mirroring because this method requires much less effort to set up than reverse log shipping. If the failure must be long-term, it is best to use backlog shipping

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Initiating transactional replication from a backup was introduced in SQL Server 2005 Some people may not know that the backup used for initialization does not have to be a full backup You can start a client with a log backup or a differential backup For example, I was leading a team that was responsible for a 1.8 TB OLTP database that was replicated across two replica servers. Our overall process for setting up replication for this database should begin with setting up log shipping. We were usually able to get to this point fairly early in the process due to the hard work we put into streamlining our backup and restore processes. The next day, we completed the replication setup knowing that the client database was in sync

Log Shipping In Sql Server 2005

The process of converting log shipping into transactional backup is very simple The following steps detail the process from configuring log shipping to not copying

Most of these steps can be completed using the GUI in SQL Server Management Studio (SSMS). However, you must use the sp_addsubscription stored procedure to create the subscription at the publisher in Step 9 because the GUI does not support the options required to start a subscriber from a backup. The sp_addsubscription stored procedure in Listing 1 creates a pool subscription for the TwoTBDatabase database on the SQLSrv02 server.

Log Shipping In Sql Server 2005

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You can use the three log shipping methods separately or combine them For example, when my team ran into some problems after a production platform migration last year, I used three methods. Figure 2 above shows a new production platform that consists of a two-node failover cluster, a log shipping server, two replication servers, and a dedicated remote replication distributor.

After the migration was complete, we ran into some issues with the new failover cluster To solve the immediate performance problem, we migrated the database from the cluster to the log shipping server and reconfigured log shipping to one of the replica servers. The failover also allowed us to take the cluster offline if necessary for troubleshooting

Log Shipping In Sql Server 2005

After the problem with the cluster was resolved, we planned some downtime to restore the cluster’s functionality. During that time, we migrated the database from the log shipping server to the cluster, canceled log shipping to the log shipping server, and reconfigured the replica server as a cluster publishing client, all in less than 15 minutes. It took a long time to reconfigure the front-end web servers to point to the cluster In general, the system did not work for only half an hour

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As this real-life example shows, the three log shipping methods I’ve discussed can minimize downtime when problems occur. They can also save you a lot of time when doing things like starting transactional replication and maintaining servers. If you want to see a demonstration of the methods, see the video on the SQL Server webpage In this demo, I perform log shipping failover, set up log shipping to the original server, and set up replication to the third server. SQL Server Log Shipping provides a DR (disaster recovery) solution for SQL Server databases and is configurable At the database level After a specified time, the SQL Server transaction log will be backed up, copied to the target site, and restored. This complete task or solution will be performed by a SQL Server function and each step is user configurable It may be difficult for a student to go through a couple of steps or troubleshoot, but for an advanced user, SQL Server log shipping configuration errors are very easy to setup and manage.

Log Shipping In Sql Server 2005

Transaction logs contain a log of all transactions that occur in a SQL Server database This is very useful in preventing data loss in case of system crash If you are not familiar with transaction logs in SQL Server, these logs are described in detail here A Beginner’s Guide to SQL Server Transaction Logs

The SQL Server instance from which the transaction log backup is sent is called the primary, and the SQL Server instance from which the transaction log backup is copied and restored is called the secondary in SQL Server log shipping. Before you configure SQL Server log shipping, the database must be in full recovery mode, otherwise bulk logging must be enabled in SQL Server log shipping. If your database is not in full recovery or bulk logging model, below T-SQL tips can help you make it in full or bulk logging model.

Log Shipping In Sql Server 2005

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On the primary server side, the publisher here is the name of the database The database recovery model can also be changed by SSMS using a directory as shown below:

If your database does not use a full or heavily logged recovery model, the SQL Server log shipping phase will return an error: “This database cannot be the primary database in a log shipping configuration because it uses a simple recovery model.” You must use either the full recovery model or a bulk-log recovery model before the transaction log is created.

Log Shipping In Sql Server 2005

As an initial step, you must enable the publisher database for SQL Server log shipping configuration To enable SQL Server log shipping on the primary end, open the Database Properties or expand the list of database operations in SSMS.

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Click Delivery Transaction Log; As the primary database is available in the log shipping configuration, a check box labeled Enable it will be available Check this box to continue:

Log Shipping In Sql Server 2005

As noted above, this SQL Server log shipping configuration requires the database to be enabled When this box is checked, the user

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