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Microsoft SQL Server 2008 R2 : Migrate to Database Mirroring 2008 as Fast as You Can

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6/28/2012 5:24:24 PM
During our ramp-up on SQL Server 2008, we decided to conduct a benchmark that pitted SQL Server 2005 database mirroring against the exact same configuration with SQL Server 2008 database mirroring. Microsoft had described some performance improvements and other added features that sounded like viable reasons to upgrade to SQL Server 2008. At the heart of our benchmark we would be seeing how much performance improvement was possible with the changes that Microsoft has made to compression of the transaction log records on the principal side, their transmission to the mirror, and the restore to the mirror. Using identical servers, we conducted a fully loaded test with heavy transaction rates—first on SQL Server 2005 and then the exact same database mirroring configuration and transaction load on SQL Server 2008 database mirroring. The results may astound you! First, we ran a transaction sequence of 100,000 iterations of complex update and insert processing against the SQL Server 2005 database mirroring configuration . Figure 1 shows the overall load and elapsed time that execution took on SQL Server 2005.
Figure 1. Transaction benchmark against SQL Server 2005 database mirroring.

As you can see from Figure 1, the load was heavy, and it took 6 hours and 5 minutes to complete the 100,000 transactions on the SQL Server 2005 database mirroring configuration. We then upgraded the exact same machines to SQL Server 2008 and ran the same transaction load. No other changes of any kind were made. Figure 2 shows the overall load and elapsed time of that identical transaction load (100,000 transactions) on SQL Server 2008.


Figure 2. Transaction benchmark against SQL Server 2008 database mirroring.



As you can see, the exact same transaction load took 3 hours and 34 minutes to complete. This result is nearly 50% faster and is completely transparent from the database and transaction point of view. Truly remarkable. This translates into being roughly 50% faster in high availability and failover. We think this example provides more than enough justification to upgrade to SQL Server 2008 as fast as you can.

Summarizing, the benchmark results are as follows:

  • Overall send rate 41% faster (2008 versus 2005)

  • Overall restore rate 52% faster (2008 versus 2005)

  • Overall availability topology inherits the restore rate yielding ~50% more availability.

We would like to thank the Peace Health database team of John Martin and Jason Riedberger for flawless benchmarking on both of these topologies.

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