I found the configuration XML file which was creating the problem.By changing the database name , it solved the problem.Since there was also check-valid-connection-sql, it was happening at a particular frequency. Thanks all! -- View this message in context: http://postgresql.1045698.n5.nabble.com/FATAL-database-a-system-data-does-not-exist-tp5754839p5755937.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general