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ORA-00018: maximum number of sessions exceeded

From: Sam Bootsma <sbootsma_at_gbrownc.on.ca>
Date: Mon, 03 Mar 2003 13:24:17 -0800
Message-ID: <F001.0055EEBD.20030303132417@fatcity.com>


We are running Oracle 7.3.4.5.0 on an IBM/AIX RISC System/6000: Version 2.3.4.0.0.  

This afternoon, our users started getting the error message "ORA-00018: maximum number of sessions exceeded." As time went on, the number of sessions was decreasing (as shown by the count of rows in v$session). However, Oracle still did not allow connections. This lasted for about 40 minutes.  

The sessions parameter in the initialization parameter file showed 300.  

Querying v$session showed 246 rows.  

Querying v$license reported:

SQL> select * from v$license;  

SESSIONS_MAX SESSIONS_WARNING SESSIONS_CURRENT SESSIONS_HIGHWATER USERS_MAX

           0                0              204                248
0  

There seems to be a contradiction here: 300 sessions in init.ora; sessions_highwater at 248, and Oracle not allowing connections because the maximum has been reached.  

Has anybody encountered this problem before. Is there a "simple" reason for this erratic behavior?  

Management is looking for an answer as to why this has happened. Thanks for any input!  

Sam Bootsma

sbootsma_at_gbrownc.on.ca  

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Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Sam Bootsma
  INET: sbootsma_at_gbrownc.on.ca

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