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You should also consider increasing the amount of random access memory (RAM) on servers involved in replication, especially on the server (or servers) that contains the Distributor, and specifying multiprocessor machines for your replication servers. Replication agents can take advantage of additional processors on the server. You can improve performance, sometimes dramatically, by ensuring you have efficiently allocated disk storage for database files and log files. Whether you have configured replication or not, you can improve performance and disaster recovery by storing transaction logs on a separate disk or disk array from database files. If you configure replication, you should also consider separate disks for all databases involved in the replication process. 1, Troubleshooting Database and Server Performance, and 4, Disaster Recovery, discuss disk array solutions. The network can be a significant performance bottleneck, particularly for transactional replication. You can significantly enhance the propagation of changes to Subscribers by using 100-megabit or gigabit ethernet. If your network is slow, you need to specify appropriate network settings and agent parameters.

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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Implementing Check and Foreign Key Constraints to Improve Query Performance C a n check and foreign key constraints improve query performance Don t they just protect us against invalid data, and in doing so, somewhat degrade performance The answers to these questions are: Yes, they can and No, they don t. Because foreign keys and check constraints are declared rules, the query optimizer can use them to create more efficient query plans. This usually involves skipping some part of the query plan because the optmizer can see that, for example, because of a foreign key constraint, it is unnecessary to execute that particular part of the plan. The following code sample is a simple example of this behavior with a foreign key constraint. Consider the following two tables and the foreign key FKOrdersCustomers:

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.

For more information about the appropriate settings for slow networks, search for A Slow Network Is Causing Problems in Books Online or access msdn2.microsoft.com/en-us/library/ms151858(d=ide).aspx.

CREATE TABLE Test.Customers ( CustomerID INT PRIMARY KEY ); CREATE TABLE Test.Orders ( OrderID INT PRIMARY KEY ,CustomerID INT NOT NULL CONSTRAINT FKOrdersCustomers REFERENCES Test.Customers (CustomerID) );

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.

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.

If you execute the following query against the two tables, the query returns all orders that have a valid customer reference.

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.

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