What is the difference between
Alter table emp cache;
Alter table emp storage (buffer_pool Keep);
The ALTER TABLE EMP CACHE puts the table in the general buffer cache, but tries to keep the table in the Most Recently Used end of the LRU list. Hopefully, this keeps the table in the cache longer. But nothing will prevent the table from being aged out the cache should system demands require it.
The second command places the table in a special section of the cache called the KEEP buffer pool. Objects in the KEEP cache hopefully won't get aged out since you've ideally sized this cache to hold your objects.
These two commands are different because they place the table in different portions of the buffer cache.
For More Information
- What do you think about this answer? E-mail the editors at editor@searchDatabase.com with your feedback.
- The Best Oracle Web Links: tips, tutorials, scripts, and more.
- Have an Oracle or SQL tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize. Submit your tip today!
- Ask your technical Oracle and SQL questions -- or help out your peers by answering them -- in our live discussion forums.
- Ask the Experts yourself: Our SQL, database design, Oracle, SQL Server, DB2, metadata, object-oriented and data warehousing gurus are waiting to answer your toughest questions.