TAILIEUCHUNG - Oracle SQL Plus The Definitive Guide- P35

Oracle SQL Plus The Definitive Guide- P35:Every day, computer professionals the world over wake up, travel to the office, sit down in front of a computer, and begin another day working with that database called Oracle. Programmers write queries and stored procedures. Database administrators monitor performance, make database changes, and perform other maintenance tasks. Operations people may need to back up or recover a database. | previous page page_307 next page previous page page_308 next page Page 308 Table 8-7. Other Hints continued Hint Description NOCACHE tablename This is the opposite of CACHE and tells Oracle to place blocks at the least recently used end of the buffer cache where they will be cleared out as soon as possible. PUSH_SUBQ Tells Oracle to evaluate nonmerged subqueries as soon as possible during query execution. If you expect the subquery to eliminate a large number of rows this can result in a performance improvement. Where to Find More Tuning Information Tuning Oracle SQL is a complex subject. The information in this chapter serves only to give you a brief overview of some of the features Oracle provides to help you during the tuning process. There is a lot of other information out there that you should avail yourself of. To start with read the manual. The Oracle8 Server Tuning manual contains a great deal of tuning information though some of it is more oriented towards tuning the database server itself rather than tuning individual SQL statements. The Server Tuning manual contains information on Oracle hints the use of EXPLAIN PLAN and the TKPROF utility. TKPROF is a bit difficult to use but can provide a great deal more information about the cost of a query than you will get with EXPLAIN PLAN. There are two good books on Oracle tuning I can recommend. One is Oracle Performance Tuning 2nd edition by Mark Gurry and Peter Corrigan O Reilly Associates 1996 . The other is Oracle SQL High-Performance Tuning by Guy Harrison Prentice-Hall 1997 . Guy Harrison s book is almost entirely focused on tuning SQL statements as opposed to tuning the server and it contains a great deal of helpful information for database programmers. previous page page_308 next page previous page page_309 next page Page 309 9 The Product User Profile In this chapter What Is the Product User Profile Using the Product User Profile In addition to the standard database security Oracle provides and .

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