Skip to Main Content

Breadcrumb

XMAS_TREE

The AskTOM team is taking a break over the holiday season, so we're not taking questions or responding to comments. Please have a happy and safe festive season and as always, thanks for being a member of the AskTOM community.

Question and Answer

Chris Saxon

Thanks for the question, oracle.

Asked: February 20, 2018 - 10:28 am UTC

Last updated: February 21, 2018 - 3:56 pm UTC

Version: 11.1.0

Viewed 10K+ times! This question is

You Asked

How many records/entry are there in v$sql,v$ession. and how they flush like Weekly or Space pressure.


Thanks

and Chris said...

V$SQL shows you the contents of the library cache. This is an area of the shared pool that stores executable SQL & PL/SQL.

How many entries there are depends on:

- How big your shared pool (library cache) is
- The complexity of the statements you run

Statements are flushed from this when:

- According to a least recently used algorithm. So the longer it's been since someone executed a SQL statement, the more like it is to be removed
- Someone flushes the shared pool or removes a single statement
- The cursor is marked invalid. This happens after actions such as stats gathering and DDL on the underlying objects. The database can use rolling invalidation to spread this out over a period of time. For more on this, read:

https://docs.oracle.com/en/database/oracle/oracle-database/18/tgsql/improving-rwp-cursor-sharing.html#GUID-E04CF45D-CC70-4122-9BAC-EAB5B4D0E17A

We're not taking comments currently, so please try again later if you want to add a comment.
more

Connor and Chris don't just spend all day on AskTOM. You can also catch regular content via Connor's blog and Chris's blog. Or if video is more your thing, check out Connor's channel and Chris's channel from their Youtube channels. And of course, keep up to date with AskTOM via the official twitter account.

More to Explore

Administration

Need more information on Administration? Check out the Administrators guide for the Oracle Database