Report Server and ORA-03135 - Connection Lost

Question

Hello,
We are running Oracle 10gR2 (AppServer, Report Server and Database) and we notice that in the error log of the database, we getting many error ora-03135-Connection Lost. After investigating a bit on this, i think i found the cause of those error. Error seem to be generated by the report server everytime it automatically shutdown an engine because engine was not use in the last 30 min. Is there a way to prevent the report server to cause this error in the DB log file ?? maybe it is only a setting to change.
And we don`t want to extend the timeout of the engine to prevent it to shutdown automatically because this will cause memory issue on the server if engine always stay up
Thank
Martin

Answer 1

Use death connection detection in the sqlnet.ora file. Usually setting SQLNET.EXPIRE_TIME is used to catch firewall timeouts, but in your case you could use it to detect that the report engine was stopped. Set SQLNET.EXPIRE_TIME to a slighty higher value than 30 minutes, say 35 minutes. Then each 35 minutes a probe packet is send to test if the connection is still alive. If not then the RDBMS ends the connection.
cheers