CountDownLatch是什么？
CountDownLatch是Java中一个同步工具类，用于控制多个线程的执行顺序。它可以让某个线程一直等待，直到其他线程完成各自的操作后再继续执行。CountDownLatch通过一个计数器来实现，计数器的初始值为线程数量，每当一个线程完成任务后，计数器的值就会减1，当计数器的值变为0时，等待的线程就会被唤醒继续执行...
ORA-24167: incompatible rule engine objects, cannot downgrade
文档解释ORA-24167:incompatibleruleengineobjects,cannotdowngradeCause:thereareruleengineobjectsinthedatabasethatcannotbedowngraded.Action:checkutlincmp.sqlandremovea...
ORA-39500: failed to notify CRS of a Startup/Shutdown event for database “string”, instance “string” (ignored)
文档解释ORA-39500:failedtonotifyCRSofaStartup/Shutdowneventfordatabase“string”,instance“string”(ignored)Cause:Theinstancewasunabletoobtainth...
ORA-16574: switchover disallowed when required databases are shut down
文档解释ORA-16574:switchoverdisallowedwhenrequireddatabasesareshutdownCause:Switchoverfailedbecauseeithertheprimarydatabaseorthedesignatedstandbydatabasewereshutdow...
ORA-16830: primary isolated from fast-start failover partners longer than FastStartFailoverThreshold seconds: shutting down
文档解释ORA-16830:primaryisolatedfromfast-startfailoverpartnerslongerthanFastStartFailoverThresholdseconds:shuttingdownCause:Theprimarydatabasewasisolatedfrombothth...
ORA-25427: cannot downgrade database links after database link data dictionary has been upgraded
文档解释ORA-25427:cannotdowngradedatabaselinksafterdatabaselinkdatadictionaryhasbeenupgradedCause:Anattemptwasmadetodowngradeaftertheupgradeofthedatabaselinkdatadic...
ORA-26726: standby and DOWNSTREAM_REAL_TIME_MINE are incompatible
文档解释ORA-26726:standbyandDOWNSTREAM_REAL_TIME_MINEareincompatibleCause:AnattemptwasmadetosetthestandbydatabaseandDOWNSTREAM_REAL_TIME_MINEoptionoftheOracleGolden...
ORA-25317: Propagation stopped because of instance shutdown
文档解释ORA-25317:PropagationstoppedbecauseofinstanceshutdownCause:Apropagationjobhasstoppedbecausetheinstanceisshuttingdown.Action:Nouseractionisrequired.ORA-25317...