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Designing Databases for Performance: What's Your Strategy?

Jun 2, 2009

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This chapter is from the book 

Data Access Handbook, The: Achieving Optimal Database Application Performance and Scalability

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Know Your Database System

You may think your database system supports all the functionality that is specified in the standards-based APIs (such as ODBC, JDBC, and ADO.NET). That is likely not true. Yet, the driver you use may provide the functionality, which is often a benefit to you. For example, if your application performs bulk inserts or updates, you can improve performance by using arrays of parameters. Yet, not all database systems support arrays of parameters. In any case, if you use a database driver that supports them, you can use this functionality even if the database system does not support it, which 1) results in performance improvements for bulk inserts or updates, and 2) eliminates the need for you to implement the functionality yourself.

The trade-off of using functionality that is not natively supported by your database system is that emulated functionality can increase CPU use. You must weigh this trade-off against the benefit of having the functionality in your application.

The protocol of your database system is another important implementation detail that you should understand. Throughout this chapter, we discussed design decisions that are affected by the protocol used by your database system of choice: cursor-based or streaming. Explanations of these two protocols can be found in “One Connection for Multiple Statements” on page 16.

Table 2-3 lists some common functionality and whether it is natively supported by five major database systems.

Table 2-3. Database System Native Support

Functionality	DB2	Microsoft SQL Server	MySQL	Oracle	Sybase ASE
Cursor-based protocol	Supported	Supported	Not supported	Supported	Not supported
Streaming protocol	Not supported	Not supported	Supported	Not supported	Supported
Prepared statements	Native	Native	Native	Native	Not supported
Arrays of parameters	Depends on version	Depends on version	Not supported	Native	Not supported
Scrollable cursors¹	Supported	Supported	Not supported	Not supported	Depends on version
Auto-commit mode	Not supported	Not supported	Native	Native	Native
LOB locators	Native	Native	Not supported	Native	Not supported

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