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Estimate memory requirements for a database server.
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Sizing Memory
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The most accurate way to predict memory needs for your dedicated database server is to perform load testing. Load testing, however, isn t always a cost-effective solution, especially for database servers not expected to carry high workloads. If load testing is not feasible, you can estimate server memory requirements by analyzing the database workload and performing calculations with values collected from this analysis.
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In the real world, budget, not capacity planning, is often the most important fac tor that determines how much memory goes into a new database server. If you ve been given $40,000 to design a system, for example, you might choose to perform a capacity planning study to design only the storage and CPU sub systems of the database server. After you design these aspects of your system that will meet your throughput and processing requirements, you can then sim ply purchase however much RAM you can afford with what is left of the $40,000.
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Sizing Memory Through Load Testing
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The key to sizing memory through load testing is to monitor memory statistics of a prototype database server while you are running a simulation of the highest expected workload against that server. To determine how much memory your system needs, add memory to the prototype server until memory counters indicate no memory pres sure. For example, if the Page Faults/sec counter remains below 20, the Page Life Expectancy counter remains above 300, and the Buffer Cache Hit Ratio counter
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Planning a Database Server Infrastructure
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remains above 90 percent while you run the workload at the highest volume level expected, the amount of RAM you have installed is sufficient for your server.
NOTE
Application tuning
Database application design affects performance much more than the amount of RAM in the sys tem does. Before you perform load testing to size memory, therefore, you first need to make sure that the database application has been tuned for efficiency. To illustrate: A certain SELECT state ment in a poorly tuned application might require as many as 1 million logical reads on the server, but with smart indexing, you might be able to reduce those logical reads to as few as 10. You can imagine that if such a query is executed frequently, no amount of RAM could improve performance as much as improving the efficiency of that query could.
Sizing Memory Through Workload Analysis
As an alternative to load testing, you can estimate the memory you need for your production database server by adding up the following memory requirements: SQL Server minimum requirements, buffer cache requirements, procedure cache requirements, connection context requirements, and any additional application requirements.
SQL Server Minimum Requirements The SQL Server minimum memory require ments cover the base memory needed to run Windows and the SQL Server executa bles. This minimum required memory equals 512 MB for all versions of SQL Server 2005 except for the SQL Server 2005 Express Edition, which requires instead a min imum of only 192 MB.
In addition to the minimum required RAM, note also the minimum recommended RAM of 1 GB for all versions of SQL Server 2005. When tabulating memory needs just for your operating system and SQL Server executables, use the figure for the minimum required RAM. However, if you eventually calculate that your server needs less than 1 GB to support the operating system, SQL Server executables, the buffer cache, the procedure cache, and the connection context, use this recommended minimum of 1 GB instead. In other words, you should not install less than 1 GB of RAM on a pro duction database server, even if you expect its workload to be very low.
Lesson 4: Estimating Memory Requirements
Table 1-8 summarizes these memory requirements and recommendations.
Table 1-8
Memory Requirements for SQL Server
SQL Server 2005 SQL Server 2005 Enterprise Edition SQL Server 2005 Developer Edition SQL Server 2005 Standard Edition SQL Server 2005 Workgroup Edition SQL Server 2005 Express Edition
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