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  Oracle Tips by Burleson

Chapter 2 Inside the Oracle Shared Pool

based on the overall shared pool size, a few of the initialization parameters, and empirical determinations from previous versions. In early versions of Oracle (notably 6.2 and lower versions), the dictionary caches could be sized individually, allowing finer control of this aspect of the shared pool. With Oracle 7 and all future releases from that point on, the internal algorithm for sizing the data dictionary caches took control from the DBA.

The shared pool is used for objects that can be shared among all users, such as table definitions, reusable SQL (although non-reusable SQL is also stored there), PL/SQL packages, procedures, and functions. Cursor information is also stored in the shared pool. At a minimum, the shared pool must be sized to accommodate the needs of the fixed areas plus a small amount of memory reserved for use in parsing SQL and PL/SQL statements. Otherwise, ORA-07445 errors will result.

Monitoring and Tuning the Shared Pool

The default values for the shared pool size initialization parameters are almost always too small by at least a factor of four. Unless your database is limited to the basic scott/tiger type schema and your overall physical data size is less than a couple of hundred megabytes, even the "large" parameters are far too small. What parameters control the size of the shared pool? Essentially only one, the shared_pool_size. The other shared pool parameters control how the variable-size areas in the shared pool are parsed out, but not overall shared pool size.

The above text is an excerpt from:

Mike Ault’s Oracle Internals Monitoring & Tuning Scripts

Written by the world's top DBA and author of over 20 Oracle books, Mike Ault shares his secrets for Oracle DBA management scripts.  This handy reference is indispensable for all Oracle professionals who must quickly automate and manage their Oracle databases with scripts.

This stellar book comes complete with an online code depot full of over 200 pre-tested Oracle DBA scripts, and covers all areas of Oracle database administration including data files, tablespace, table and index management scripts.  Based on more than 20 years full-time experience, Mike Ault brings his expertise to the public with this fantastic book.  Your time savings from a single script is worth the price of this great book.

Mike Ault is one of the leading names in Oracle technology.  The author of 20 books and hundreds of articles in national publications, Mike was the first popular Oracle author with his landmark book "Oracle7 Administration and Management".  Mike also wrote several of the "Exam Cram" books, and enjoys a reputation as a leading author and Oracle consultant.

Mike started working with computers in 1979 right out of a stint in the Nuclear Navy. He began working with Oracle in 1990 and has since become a World Renowned Oracle expert (in the words of his publisher anyway!) Mike has written 14 Oracle related books, dozens of articles, and has presented at conferences in Europe and the USA. Mike has two wonderful daughters and is kept out of trouble by his wife of 29 years, Susan.

See the Oracle script collection::



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