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In addition to the types of backups we have described already, there are several other ways to protect information. In this section, we ll take a brief look at some more advanced data protection options. These include the following: w Data Transformation Services (DTS) By using DTS to copy data to and from other data repositories, you can protect your organization s most important information. Depending on the type of data, this might be an ideal solution. For example, if daily summaries of sales performance are more important than a list of the actual transactions themselves, you might want to calculate this data periodically and store the results in an Excel spreadsheet. Replication Although the primary purpose of replication is to distribute information, it can serve as a good way to back up information. SQL Server 7 supports several different types of replication. If you have requirements to distribute information across a WAN or to multiple servers, replication can make sure that the information stays synchronized. When implemented
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6:
Performing Database Backups
properly, replication can provide for an automatic offsite copy of important information. The tradeoff (it s always something!) is the bandwidth that is required for transferring data and a possible loss of some information after a server failure. s Standby servers Standby servers are often referred to as warm backup devices. They provide the ability to perform a quick recovery from a failed server situation. The idea is that a second server will always maintain a copy of all the data stored on the production machine. To keep data synchronized, a constant process called log-shipping is used. In this process, transaction logs are periodically created on the production server and are then automatically restored to the standby machine. In the event of a failure, the standby server can be reconfigured with the name and network information of the production server, or users can be redirected to the new machine. Note, however, that this change must be handled at the client- or application-side, since the information about the server will change. Although some downtime will occur, it will be nowhere near the amount of time required to rebuild an entire database or server from scratch. Clustering A cluster, defined simply, is a collection of machines that appear to act as one. There are two main benefits to clustering your servers. The first is fail-over support. In a clustered configuration, if one server becomes unavailable, the other automatically takes its place, thus eliminating downtime. The other benefit is an increase in performance caused by load balancing. In this configuration, multiple disk, memory, processor, and network subsystems can work together to provide information to users as quickly as possible. Clustering technology is complex and expensive, because it involves sharing hard disks and providing for redundant network connections. However, it provides for maximum availability and can increase performance. The goal is for failures to be transparent (other than possible loss in performance).
Each of these technologies can be quite complex (although Microsoft has made them easy to work with in SQL Server 7). Since they re such powerful features, further discussion in a book about backup and recovery is a must! (We ll cover these data protection options in detail in 8, Advanced Data Protection Tactics. )
IMPLEMENTING SQL SERVER BACKUPS
As I mentioned in the introduction of this book, the steps required to perform backup and recovery operations are actually a very small part of a good data protection plan. However, they are one of the most important; you can plan for months, but if you don t properly execute the designed plan, it will be of little value. In this chapter, we ll look at the various commands and features available in SQL Server 7 for performing backup operations. The first step will be preparing security and media for backup operations. Then, we ll start with the easiest method: the Database Maintenance Plan Wizard. Using the
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