Are views cached

I have a view say view1
the first time i run it,it returns in 110 sec
the second time i run it,it returns in 10 sec
Are the views cached in oracle.IF so how to disable it
Kindly help

> Are the views cached in oracle.
No. You are implying that a view is some kind of "result set" that is kept in memory.
A view is a SQL statement. That SQL statement is parsed and cached in the Shared Pool. This is called a hard parse. If that SQL statement is already in the Shared Pool, Oracle simply re-uses that copy. This is called a soft parses. A 100,000 hard parses can take many minutes. A 100,000 soft parses can take a few seconds.
Hard parsing is thus a lot more expensive than soft parsing. But for a single query, looking at that query's elapsed execution time only, a hard parse versus a soft parse will not result in a huge difference.
I/O is the most expensive operation on a database. There are two types.
PIOs or Physical I/Os - getting data from disk.
LIOs or Logical I/Os - getting data from the Oracle buffer cache.
A PIO can be a lot slower (and usually is) than a LIO. Typically you will run a query for the 1st time. Data is on disk. Lots of very expensive and slow PIOs.
The 2nd time, with the data in the cache, LIOs are used. A lot cheaper than those expensive PIOs.
Note that an Oracle PIO is not always an actual physical I/O - it simply means that Oracle did not find the data in its cache and called the o/s kernel to perform an I/O. The o/s itself has buffer caches. It may service that PIO call from Oracle by going to actual disk - or it may find that data in its file system buffer cache.
> IF so how to disable it
Why? There are NO valid reasons for doing it, unless you are doing very basic benchmarking.. and even then, that approach to benchmarking needs to be questioned as the approach looks at one specific state only - which does NOT exist as the sole state on ANY Oracle database instance.
Message was edited by:
Billy Verreynne

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