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Database Mirroring
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Recently I was asked to explain database mirroring in the simplest terms possible. About the only thing I could think to say was the following story: Long ago, in ancient times, in the time before time, people were asked to make copies of their work. This led to some very interesting inventions throughout history, most notably the printing press, the polygraph, and ultimately the modern day copy machines that became a big hit at holiday office parties. But as society progressed to the point where deliverables were measured in fractions of a second as opposed to days or weeks, these archaic methods were no longer good enough. More and more demand was placed upon people to deliver the same piece of information into many different places all at the same time without any loss of service. Soon a great battle took place between two giant beasts named Cluster and Log Shipping, who had easily beaten down the inferior SQL Replication in a pay-per-view event two months prior. Cluster and Log Shipping battled for years, neither giving an inch to the other, until such time that they were both badly beaten, weakened, and barely able to stand. At the time of SQL Server 2005 s release, a great hero rose from the ashes of Cluster and the ruins of Log Shipping. The hero s name was Database Mirroring, and promised that everything was going to be different. Database Mirroring promised real-time
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CHAPTER 3: Some Basics
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synchronization of your data without the hassle of log shipping. Database Mirroring promised faster failover without the need for a cluster. In short, Database Mirroring promised the best of all other technologies, with none of the shortcomings, and even brought along a witness to attest to its abilities. And there you have it. Database mirroring looks to give you the very best in HA by combining all of the good in other tools and none of the bad. However, there is one tiny little thing that makes database mirroring not as perfect as people may think: you only get one mirror. Oh sure, you can go to a clothing store and stand in those fancy mirrors that let you see parts of your body you didn t even know existed. Well, database mirroring gives you one mirror, no more. So, if you have the need to mirror your data to more than one location, then you need a different solution. You could, if so desired, configure your mirror and also configure log shipping to other servers. But the one mirror itself will not provide that option for multiple servers. Other than that one issue, database mirroring is a fine alternative to clustering, log shipping, and replication. It truly does offer a wonderful HA solution that will satisfy the HA requirements for many shops. In fact, asynchronous mirroring could be used for DR purposes, which is important as you begin to plan for what to do when disaster strikes.
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Disaster Recovery Planning
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DR planning is essential; not only for your job security, but for the entire company s existence. You can do a quick search on the Internet regarding the number of companies that have gone out of business simply due to their failure to plan for a disaster. Most commonly you will find companies that simply did not have any idea about the need to recover their data in a timely fashion. I see a lot of cases where companies go under because of something boneheaded, such as relying on RAID 5 as the only means for preventing a disaster. TIP: When it comes to DR, failure to plan is planning to fail. You simply must plan for a disaster. No scenario is out of the question. Whenever I see a new design, I usually point to a particular section and ask, What if that server disappears What then Asking those types of questions are the only way to effectively plan for a disaster. One of the better methods I have come across when it comes to DR planning is to simply ask the question, what will we do if . . . You ask the question until you reach a point where there is nothing left that you could effectively plan for. Here is an example: Q: What will we do if that server melts A: We have SAN replication and would just need to boot up the DR server.
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