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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...

开发笔记 ·2024-03-19

ORA-24167: incompatible rule engine objects, cannot downgrade

文档解释ORA-24167:incompatibleruleengineobjects,cannotdowngradeCause:thereareruleengineobjectsinthedatabasethatcannotbedowngraded.Action:checkutlincmp.sqlandremovea...

IT技术学习 ·2023-07-28

ORA-39502: failed to notify CRS of a Startup/Shutdown event [string] (ignored)

文档解释ORA-39502:failedtonotifyCRSofaStartup/Shutdownevent[string](ignored)Cause:Theinstancewasunabletocreateanenvironmentcontext.Action:NoneRequired.Theerrorisign...

IT技术学习 ·2023-07-28

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...

IT技术学习 ·2023-07-28

ORA-16574: switchover disallowed when required databases are shut down

文档解释ORA-16574:switchoverdisallowedwhenrequireddatabasesareshutdownCause:Switchoverfailedbecauseeithertheprimarydatabaseorthedesignatedstandbydatabasewereshutdow...

IT技术学习 ·2023-07-28

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...

IT技术学习 ·2023-07-26

ORA-10997: another startup/shutdown operation of this instance inprogress

文档解释ORA-10997:anotherstartup/shutdownoperationofthisinstanceinprogressCause:AnOracleInstancestartuporshutdownoperationfailedtoprocuretheserializationprimitive.A...

IT技术学习 ·2023-07-26

ORA-16631: operation requires shutdown of database or instance “string”

文档解释ORA-16631:operationrequiresshutdownofdatabaseorinstance“string”Cause:TheDataGuardbrokeroperationrequiredashutdownofthedatabaseorinstance.Action:...

IT技术学习 ·2023-07-26

ORA-25427: cannot downgrade database links after database link data dictionary has been upgraded

文档解释ORA-25427:cannotdowngradedatabaselinksafterdatabaselinkdatadictionaryhasbeenupgradedCause:Anattemptwasmadetodowngradeaftertheupgradeofthedatabaselinkdatadic...

IT技术学习 ·2023-07-26

ORA-26726: standby and DOWNSTREAM_REAL_TIME_MINE are incompatible

文档解释ORA-26726:standbyandDOWNSTREAM_REAL_TIME_MINEareincompatibleCause:AnattemptwasmadetosetthestandbydatabaseandDOWNSTREAM_REAL_TIME_MINEoptionoftheOracleGolden...

IT技术学习 ·2023-07-26

ORA-25317: Propagation stopped because of instance shutdown

文档解释ORA-25317:PropagationstoppedbecauseofinstanceshutdownCause:Apropagationjobhasstoppedbecausetheinstanceisshuttingdown.Action:Nouseractionisrequired.ORA-25317...

IT技术学习 ·2023-07-26

ORA-16403: shut down in progress – remote connection is not permitted

文档解释ORA-16403:shutdowninprogress–remoteconnectionisnotpermittedCause:Aredotransportsessioncouldnotbestartedbecausethedatabasewasshuttingdown.Action:Waitfo...

IT技术学习 ·2023-07-23

ORA-40226: model upgrade/downgrade must be performed by SYS

文档解释ORA-40226:modelupgrade/downgrademustbeperformedbySYSCause:Upgrade/Downgraderoutinesarebeinginvokedbyauserwithinsufficientprivilieges.Action:Runtheroutinesas...

IT技术学习 ·2023-07-23

ORA-39702: database not open for UPGRADE or DOWNGRADE

文档解释ORA-39702:databasenotopenforUPGRADEorDOWNGRADECause:Anupgrade,downgrade,reload,orpatchscriptwasinvokedwhenthedatabasewasnotopenforUPGRADEorDOWNGRADE.Action:...

IT技术学习 ·2023-07-22

ORA-15097: cannot SHUTDOWN ASM instance with connected client (process string)

文档解释ORA-15097:cannotSHUTDOWNASMinstancewithconnectedclient(processstring)Cause:ASHUTDOWNcommandwasissuedtoanASMinstancethathadoneormoreconnectedclients.Action:S...

IT技术学习 ·2023-07-22