ORA-00018. Exceed the maximum number of sessions

Hi all

I have a windows Server 2003, oracle 10g release 2.
connection of 300 users competitor.

My SESSIONS parameter = 800
My PROCESS parameter = 723.

After 2 or 3 days, I got the following message when I try to connect.

ORA-00018. Maximum number of sessions to exceed.

even I have restart my server, I got this number sometimes.

What is the problem? I'm really in a very bad situation, users can not connected.

Thank you

Please post output commands below:

Select the value of the parameter $ v where name = "sessions";
Select count (*) in the session of v$.
Select * from v$ resource_limit;

If you see the 3rd command output as equal values in all the columns then its correct and Oracle returned ORA-00018.

Then, V$ SESSION is fake! It does not report all sessions really in use. If you look in V$ SESSION see text (with the help of V$ FIXED_VIEW_DEFINITION), you will see that V$ SESSION reports of the sessions USER and only BACKGROUND.

But there is a 3rd type of session - a RECURSIVE session, which is used for recursive calls data dictionary as explained above. V$ SESSION does not display these.

So what is the moral of this story?

Oracle uses recursive sessions for recursive data dictionary operations
These sessions are also taken from the array of objects in session state controlled by the session setting
V$ SESSION shows no recursive sessions, but V$ RESOURCE_LIMIT told it the truth about the use of the session state object table
If you hit the error ORA-00018, and then expand your table of parameters of sessions or configure your application to use fewer connections or sessions

Note that Oracle 11.2 changed the automatic calculation of parameters of sessions and large number of session state objects is attributed to a number of default process.

Source: http://tech.e2sn.com/oracle/oracle-internals-and-architecture/recursive-sessions-and-ora-00018-maximum-number-of-sessions-exceeded

Concerning
Girish Sharma

Tags: Database

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