ORA-18 ORA-604 Making New Connections to Database (Doc ID 1036728.6)

Last updated on DECEMBER 06, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 8.0.6.0 to 11.2.0.4 [Release 8.0.6 to 11.2]
Information in this document applies to any platform.
*** Checked for relevance on 6-Oct-2014 ***

Symptoms

 You receive the following errors when trying to make new connections:

ORA-00604: error occurred at recursive SQL level 1
Cause: An error occurred while processing a recursive SQL statement.
               (a statement applying to internal dictionary tables).
Action: If the situation described in the next message on the stack can be corrected, do so; otherwise, contact customer support.


    

ORA-00018: maximum number of sessions exceeded
Cause: An operation requested a resource that was unavailable.
               The maximum number of sessions is specified by the initialization parameter SESSIONS.
               When this maximum is reached, no more requests are processed.
Action: Try the operation again in a few minutes. If this message occurs often, shut down Oracle, increase the SESSIONS parameter in the initialization parameter file, and restart Oracle.

  
NOTE: No new connections are permitted to the database.

Selecting count(*) from V$SESSION returns a value that is less than the current setting of the SESSIONS parameter which is either derived (default) or specifically set in the "init.ora".

Cause

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