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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-55366: unknown namespace prefix “string”

文档解释ORA-55366:unknownnamespaceprefix“string”Cause:AnattemptwasmadetomakeuseofanundefinednamespaceprefixinOracleVirtualPrivateDatabase(VPD)metadata.A...

IT技术学习 ·2023-07-28

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-39931: XML Schema string Owner: string not fully contained in the transportable set.

文档解释ORA-39931:XMLSchemastringOwner:stringnotfullycontainedinthetransportableset.Cause:Informationalmessagetodescribeafailureduringtransportablecontainmentchecki...

IT技术学习 ·2023-07-28

ORA-23434: master site string not known for object group

文档解释ORA-23434:mastersitestringnotknownforobjectgroupCause:Thesitenamegivenasanargumenttoaroutinewasnotalreadyknowntothereplicatedobjectgroup.Action:Executethedb...

IT技术学习 ·2023-07-28

ORA-15563: workload replay client cannot spawn new threads

文档解释ORA-15563:workloadreplayclientcannotspawnnewthreadsCause:TheWorkloadReplayClientdoesnothaveenoughresource(CPUormemory)tospawnnewthreads.Action:Restartthewor...

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-28557: unknown string for database link to non-Oracle system

文档解释ORA-28557:unknownstringfordatabaselinktonon-OraclesystemCause:Whenattemptingtoconnecttoanon-OraclesystemthroughaHeterogeneousServicesdatabaselink,theagentsu...

IT技术学习 ·2023-07-28

ORA-27215: skgfgsmcs: sbtinfo2 returned unknown file

文档解释ORA-27215:skgfgsmcs:sbtinfo2returnedunknownfileCause:Duringansbtinfo2()call,themediamanagementsoftwarereturnedinformationaboutanunknownbackupfile.Action:Con...

IT技术学习 ·2023-07-27

ORA-24536: Warning – column authorization unknown.

文档解释ORA-24536:Warning–columnauthorizationunknown.Cause:Columnsecurityisunknownforoneormorecolumns.Action:Verifythefetcheddata.Itmayormaynotcontainameaning...

IT技术学习 ·2023-07-26

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-24072: cannot execute MIGRATE_QUEUE_TABLE procedure; must own queue table

文档解释ORA-24072:cannotexecuteMIGRATE_QUEUE_TABLEprocedure;mustownqueuetableCause:AnattemptwasmadetoupgradeordowngradeaqueuetableusingtheDBMS_AQADM.MIGRATE_QUEUE_T...

IT技术学习 ·2023-07-26

ORA-29264: unknown or unsupported URL scheme

文档解释ORA-29264:unknownorunsupportedURLschemeCause:TheURLschemewasunknownorunsupported.Action:ChecktheURLtomakesurethattheschemeisvalidandsupported.ORA-29264是由于访问...

IT技术学习 ·2023-07-26