Analytic engine is not able to connect to oracle DB

Hi,

I have defined environment in MWS for Analytic engine and when I am trying to start Analytic engine it is giving db connection refused error. Suddenly IS is not connecting to db. when I close Optimize console. Again IS is able to connect to db. The issue here is when I start analytic engine, connection to db is not accessible. Please help me in resolving this

Error:

2013-04-03 16:48:24.484 IST WARN: Connection create attempt failed; reason: [sag-cjdbc42-0011][Oracle JDBC Driver][Oracle]Connection refused, (DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4)))); re-trying…
() [JDBCPools.admin.1100] 2013-04-03 16:48:24.484 IST ERROR: Failed to create connection due to SQLException-- URL ‘jdbc:wm:oracle://localhost:1521;serviceName=xe’, user ‘Satish’, reason: [12516] [sag-cjdbc42-0011][Oracle JDBC Driver][Oracle]Connection refused, (DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4))))
() [JDBCPools.admin.2311] 2013-04-03 16:48:24.484 IST WARN: Connection create attempt failed; reason: [sag-cjdbc42-0011][Oracle JDBC Driver][Oracle]Connection refused, (DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4)))); re-trying…
() [JDBCPools.admin.1100] 2013-04-03 16:48:30.984 IST ERROR: Failed to create connection due to SQLException-- URL ‘jdbc:wm:oracle://localhost:1521;serviceName=xe’, user ‘Satish’, reason: [12516] [sag-cjdbc42-0011][Oracle JDBC Driver][Oracle]Connection refused, (DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4))))
() [JDBCPools.admin.2311] 2013-04-03 16:48:30.984 IST WARN: Connection create attempt failed; reason: [sag-cjdbc42-0011][Oracle JDBC Driver][Oracle]Connection refused, (DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4)))); re-trying…
() [JDBCPools.admin.1100] 2013-04-03 16:48:31.0 IST ERROR: Failed to create connection due to SQLException-- URL ‘jdbc:wm:oracle://localhost:1521;serviceName=xe’, user ‘Satish’, reason: [12516] [sag-cjdbc42-0011][Oracle JDBC Driver][Oracle]Connection refused, (DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4))))
() [JDBCPools.admin.2311]

Regards,
Satish Devineni