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-26526: materialized view sql ddl parse/expansion failed for string.string
文档解释ORA-26526:materializedviewsqlddlparse/expansionfailedforstring.stringCause:TheclientsqlmaterializedviewdefinitionquerycouldnotbeproperlyparsedbythemasterOra...
ORA-19970: multi-instance standby role transition in progress
文档解释ORA-19970:multi-instancestandbyroletransitioninprogressCause:ALTERDATABASEMOUNTfailedbecauseamulti-instancestandbyroletransitionwasinprogress.Action:Retryaf...
ORA-28674: cannot reference transient index-organized table
文档解释ORA-28674:cannotreferencetransientindex-organizedtableCause:Anattemptwasmadetodirectlyaccessatransienttablecreatedcreatedonbehalfofaindex-organizedtablepart...
ORA-19976: a concurrent standby role transition in progress
文档解释ORA-19976:aconcurrentstandbyroletransitioninprogressCause:Thestandbyroletransitionoperationfailedbecauseaconcurrentstandbyroletransitionwasalreadyinprogress...
ORA-44803: Plan is in transition (about to be activated)
文档解释ORA-44803:Planisintransition(abouttobeactivated)Cause:Newplanwasattemptedtobecreatedbeforeactivatingthecurrentplan.Action:Completelysubmitthecurrentplananda...
ORA-21708: inappropriate operation on a transient object
文档解释ORA-21708:inappropriateoperationonatransientobjectCause:Userattemptedtoperformaninappropriateoperationonatransientobject.Operationsthatcannotbeappliedtoatra...