High Availability

Microsoft SQL Server 2012 Always On AGs at StackOverflow

I recently finished helping the StackExchange team migrate their SQL Server 2008 infrastructure to SQL Server 2012. These servers power StackOverflow, DBA.StackExchange.com, the new AskPatents partnership with the US Patent and Trademark Office, and hundreds of other Q&A sites that together form one of the biggest web site networks. It’s one of the most visible…
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Why Your SQL Server’s Network Connection Matters

If you’re using SQL Server 2012’s hot new AlwaysOn Availability Groups feature, your databases will go offline when your network connection does – even if you’re using asynchronous replication. This is not a bug.  This is working as designed – and it’s important to understand the underlying concepts. Nothing to see here, I'm just going…
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SQL Server Always On Availability Groups in AWS

Many companies are investigating a move into cloud hosting. With the recent release of SQL Server 2012, these very same companies are also looking at a migration to SQL Server 2012 to take advantage of readable secondaries. Combining Amazon Web Services and SQL Server 2012 seems like a perfect match. Unfortunately, there are some gotchas,…
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An Introduction to SQL Server Clusters

Clustering
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The options for high availability can get confusing. I was lucky enough to begin working with SQL Server clusters early in my career, but many people have a hard time finding simple information on what a cluster does and the most common gotchas when planning a cluster. Today, I’ll tell you what clusters are, what they’re…
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Mirrors aren’t backups

Are you using any of these technologies as a method of database protection? Database mirroring (keeping two database servers synchronized with the same data via SQL 2005/2008) Replication (copying records between databases) Log shipping (copying log files to another server and restoring them immediately) SAN-based mirroring (storing two copies of your database on two different…
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