When running an Unload (as part of maintenance) the unload fails at a specific time interval with the following:
20190926/181705.788 - U00003524 UCUDB: ===> Time critical DB call! OPC: 'EXEC' time: '1:664.377.999'
20190926/181705.788 - U00003525 UCUDB: ===> 'insert into DIVDB (DIVDB_PK) select distinct RH_AH_idnr from RH where RH_DeleteFlag = 1 and rownum <= 1000'
20190926/184708.443 - U00029108 UCUDB: SQL_ERROR Database handles DB-HENV: 106ef50 DB-HDBC: 10e6068
20190926/184708.443 - U00003591 UCUDB - DB error info: OPC: 'OCIStmtExecute' Return code: 'ERROR'
20190926/184708.443 - U00003592 UCUDB - Status: '' Native error: '3135' Msg: 'ORA-03135: connection lost contact
Release : 12.0
Component : AUTOMATION ENGINE
This is due to a firewall/network setting that is severing the connection.