PHP Zend with PostgreSQL Issue

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http://serverfault.com – I have been developing a web application by using PHP Zend with Database of PostgresSQL in windows XP environment. Apache version 2.2 PostgreSQL version 8.4 Some time, application not retrieve the data from specific table of Database. Programming is just SELECT data check if exist, then insert. Postgres connection is working correctly, because login and other list working correctly. The above program totally not working. Once after restart PostgreSQL & Apache server, then working perfectly. Could you any one help me what is exact reason for these issue ? (HowTos)