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Before consolidating database servers, ensure that the target server can handle the disk requirements in terms of both disk space and input/output (I/O) capacity resulting from the consolidation. To anticipate disk space requirements, add to the target server s current disk usage the space used by all the databases you want to migrate. To anticipate I/O requirements, you can use tools such as SQLIO.EXE to measure the disk I/O activity on each of the
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servers that you have targeted for consolidation. Using this tool can help you to predict the increase in disk I/O activity resulting from consolidation on the target server.
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On the 70-443 exam, questions about consolidation use disk space as the pri mary consideration for determining which servers to consolidate and the target server on which to consolidate. To answer such questions correctly, choose the consolidation solution that leaves the most amount of free space on the target server. For example, suppose that you plan to consolidate Server1 and Server2 and need to determine which server s data to migrate. If Server1 has 1 GB of data and 5 GB of free space, and Server2 has 500 MB of data and 2 GB of free space, how much free space would be left over if you migrated Server1 to Server2 and vice versa Because migrating Server1 to Server2 would leave 1 GB of free space on Server2, and migrating Server2 to Server1 would leave approximately 4.5 GB of free space on Server1, it makes sense to migrate the data from Server2 to Server1. Note that the free space is sufficient for a migration in either direction. Despite this, there is only one correct answer.
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To anticipate the memory requirements of the consolidation server, add together the memory usage of the servers you plan to consolidate. This sum is typically sufficient for estimation purposes; however, if several databases share tables, the consolidated memory requirement might be less than the sum of the memory that is used by the individual databases. To roughly estimate CPU usage on your consolidation server, add together the CPU usage on all servers. This estimation method is most accurate when all CPU types are identical. However, note that this estimation method is based on the assumption that all databases are used at approximately the same time of day. If one database is used at night and another is used during the day, however, there might be little or no increase in CPU usage when you consolidate the data bases on a single server.
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When you consolidate database servers on a new server, you should expect that the traffic to and from the new server will be roughly equivalent to all the client traffic to and from the separate servers combined. Adding together the traffic in this way, you can estimate the anticipated network throughput require ments to the consolidation server and ensure that the connection to and from the server is sufficient to support these requirements.
Lesson 2: Planning Database Consolidation
Quick Check
1. How might consolidation enable you to improve database security 2. The usage of which server subsystem is emphasized most heavily in ques tions regarding consolidation on the 70-443 exam
Quick Check Answers
1. By centralizing administration, consolidation enables a single strict secu rity policy to be enforced across all databases. 2. The disk subsystem, specifically as it relates to available disk space.
Designing a Server Consolidation Plan
Consolidating database servers can have a significant impact on an organization, and you need to plan for it accordingly. When creating a plan, you must identify the data base servers that you want to consolidate and provide a strategy for migrating them to the consolidated environment. You must also describe potential problems, such as those pertaining to server compatibility and connectivity, and then define measures to prevent such problems. When designing a database server consolidation plan, you should perform the follow ing steps: 1. Gather information about dispersed data. To prepare for database consolidation, take inventory of the databases dispersed in your organization, the business entities (such as customers and orders) that these databases support, and the critical processes that use these same data bases. Be sure to note the redundant entities such as tables and stored proce dures used by multiple databases. 2. Identify potential consolidation problems. When you consolidate database servers, problems can arise related to connectiv ity, server object references, database replication, and database compatibility. Connectivity problems can stem from the change in the database server name or from the migration of a server installation to a named instance. If you want to use multiple instances for consolidation, you must determine whether applications can connect to named instances.
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