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In this chapter, we looked at various methods for restoring data. Of course, few of these methods would have been useful if you had not properly performed your data backups! We started with some general information on planning for data recovery. Then, we moved on to look at the different types of data loss you might experience in the best case (next to no data loss at all, of course!), you would only need to restore a specific table from a database. A much more serious and time-consuming process would be required if you had a hardware failure in your system. After discussing the ways backups can be used to restore information, we moved on to discuss how to recover information in SQL Server. There are many ways to effectively use full, differential, and transaction log backups to recover as much lost information as possible. With this information, you should have the details you need to implement and manage a solid data protection plan. Thus far, we ve looked at ways to back up and restore data. So what s left In many companies, the standard backup and recovery options available through SQL Server provide an adequate solution. In other environments, however, you might need even more data protection. In the next chapter, we ll discuss some advanced options available for protecting information. These tools and techniques include replication, clustering, and the use of standby servers. Though the implementations might be quite different, the goal is the same to provide as much protection of your information as possible.
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o far, we ve covered the fundamental steps involved in establishing a data protection strategy: planning for and implementing security, backup processes, and recovery procedures. For many business environments, the proper application of these steps will provide adequate data protection. However, as organizations become increasingly reliant on their information technology resources, greater demands on uptime and performance may be required. In these situations, more advanced data protection methods can be invaluable. In this chapter, we ll look at some ways to use features in SQL Server 7 to protect information. Specifically, you can use replication to distribute data to remote servers, to increase performance and data protection. Similar goals can also be achieved through the use of standby servers. Finally, clustering technologies can provide the best uptime and performance features of all of these solutions. Let s get started by looking at ways in which you can use replication to distribute information better.
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In an ideal world, none of your employees would ever need to leave the comfort and safety of your LAN. Furthermore, all of your network resources would reside within one physical building in which all employees worked. In this case, all of your data would be stored in the same location (the datacenter ) and made available to those who need it via the network. There would be no need to store data in various different geographic locations, since all connections would be treated as equal. In the real world, however, things are quite different. Users require data regardless of their location. Your network connections have different characteristics and bandwidth capabilities. First, networking connections across WANs generally are slower and more expensive than networks located within a single building or campus. A typical setup for a medium-sized company, for example, might consist of a large corporate office plus many other remote or branch offices located in various cities throughout the world. Users in every office must have access to information, but it is much too costly to connect them all with the same high-speed access available on a LAN. To accommodate these scenarios, it is often necessary to distribute data between multiple servers while simultaneously ensuring that all the information remains synchronized. For example, if a salesperson updates customer information in New York, that information should also be updated in the Austin database. Furthermore, the changes should be propagated based on business requirements. In some cases, such as financial transactions, it is important that the time between updates on different servers is minimized. In other cases, however, one day or more of lag time is acceptable. Solving problems related to working with distributed information is the job of replication a feature in SQL Server 7 that facilitates the distribution of data across multiple servers. Figure 8-1 illustrates how replication can reduce networking and resource demands in a distributed environment. Notice that when it comes to data protection, replication automatically provides an offsite copy of information. Although, in general, replication is not a good substitute for standard backups, it is a good way to ensure that you have multiple copies of information.
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