com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections
最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式：打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...
ORA-24404: connection pool does not exist
文档解释ORA-24404:connectionpooldoesnotexistCause:Anattemptwasmadetousetheconnectionpoolbeforecreatingit.Action:Createtheconnectionpool.ORA-24404：连接池不存在官方解释ORA-2440...
ORA-24392: no connection pool to associate server handle
文档解释ORA-24392:noconnectionpooltoassociateserverhandleCause:OCIServerAttachcalledinOCI_POOLmodebutnoconnectionpoolfoundtoassociatetheserverhandle.Action:1)Verify...
ORA-30678: too many open connections
文档解释ORA-30678:toomanyopenconnectionsCause:Anattempttoopenaconnectionfailedbecausetoomanyarealreadyopenbythissession.Thenumberofallowedconnectionsvariesassomemay...
ORA-28509: unable to establish a connection to non-Oracle system
文档解释ORA-28509:unabletoestablishaconnectiontonon-OraclesystemCause:Initializationofadatabaselinktoanon-OraclesystemfailedtoconnecttotheHeterogeneousServicesagent...
ORA-24401: cannot open further connections
文档解释ORA-24401:cannotopenfurtherconnectionsCause:Sufficientnumberofconnectionsarenotpresentinthepooltoexecutethecall.NonewconnectionscanbeopenedastheconnMaxparam...
ORA-06737: TLI Driver: connection failed
文档解释ORA-06737:TLIDriver:connectionfailedCause:TLIcouldnotestablishaconnectiontotheremoteTLIserver.Action:CheckthattheremoteTLIserverisrunningwiththestatusutilit...
ORA-28576: lost RPC connection to external procedure agent
文档解释ORA-28576:lostRPCconnectiontoexternalprocedureagentCause:ofthiserrorisabnormalterminationoftheinvoked“C”routine.Ifthisisnotthecase,checkfornetwo...
ORA-16143: RFS connections not allowed during or after terminal recovery
文档解释ORA-16143:RFSconnectionsnotallowedduringorafterterminalrecoveryCause:Anattemptwasmade,byanRFSprocess,toaccessastandbyonlinelogfileduringorafteraterminalreco...
ORA-25425: connection lost during rollback
文档解释ORA-25425:connectionlostduringrollbackCause:Theconnectionwaslostwhileissuingarollbackandtheapplicationfailedover.Action:Theconnectionwaslostandfailoverhappe...
ORA-30690: timeout occurred while registering a TCP/IP connection for data traffic detection
文档解释ORA-30690:timeoutoccurredwhileregisteringaTCP/IPconnectionfordatatrafficdetectionCause:AtimeoutoccurredwhileregisteringaTCP/IPconnectionfordatatrafficdetect...