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ORA-31520: CDC subscription string already subscribes to publication ID string

文档解释ORA-31520:CDCsubscriptionstringalreadysubscribestopublicationIDstringCause:AChangeDataCapturesubscriptionintendedforimportalreadysubscribedtoapublication.Ac...

IT技术学习 ·2023-07-16

ORA-25313: a queue may not subscribe to itself for propagation

文档解释ORA-25313:aqueuemaynotsubscribetoitselfforpropagationCause:ThespecifiedsubscriberhadaNULLnameandanaddressequaltothequeuename.Action:Provideavalidsubscribera...

IT技术学习 ·2023-07-16

ORA-25242: cannot change subscriber name from string to string without FIRST_MESSAGE option

文档解释ORA-25242:cannotchangesubscribernamefromstringtostringwithoutFIRST_MESSAGEoptionCause:AnattemptwasmadetochangethesubscribernamewhileusingtheNEXT_MESSAGEorNE...

IT技术学习 ·2023-07-13

ORA-24035: AQ agent string is not a subscriber for queue string

文档解释ORA-24035:AQagentstringisnotasubscriberforqueuestringCause:AnAQagentthatwasnotasubscriberforthequeuewasspecified.Action:Checkthenameand/oraddressoftheagenta...

IT技术学习 ·2023-07-11

ORA-25320: Failed to create, alter, or remove Subscriber

文档解释ORA-25320:Failedtocreate,alter,orremoveSubscriberCause:Thereisapendingenqueueordequeueoperationonthisqueuefromthesamesession.Action:EitherCOMMITorROLLBACKpe...

IT技术学习 ·2023-07-11

ORA-31531: could not find column string in CDC subscriber view string.string

文档解释ORA-31531:couldnotfindcolumnstringinCDCsubscriberviewstring.stringCause:AcolumnwasmissinginasubscriberviewforanimportedChangeDataCapturesubscription.Action:...

IT技术学习 ·2023-07-10

ORA-31430: subscriber view exists

文档解释ORA-31430:subscriberviewexistsCause:Aviewthatisalreadyinusewasspecifiedforthesubscriberview.Action:CalltheSUBSCRIBEprocedureusingadifferentsubscriberviewnam...

IT技术学习 ·2023-07-09

ORA-24062: Subscriber table string inconsistent with queue table string

文档解释ORA-24062:SubscribertablestringinconsistentwithqueuetablestringCause:Thesubscribertablehasnotyetbeensuccessfullyimported.Action:Importthesubscribertablebefo...

IT技术学习 ·2023-07-09

ORA-24083: cannot specify remote subscribers for string QUEUE string

文档解释ORA-24083:cannotspecifyremotesubscribersforstringQUEUEstringCause:Anadd_subscribercallwithanon-nulladdressfieldwasissuedonaqueuewhichdoesnotsupportremotesub...

IT技术学习 ·2023-07-08

ORA-31521: CDC subscription string already subscribes to publication ID string column string

文档解释ORA-31521:CDCsubscriptionstringalreadysubscribestopublicationIDstringcolumnstringCause:AChangeDataCapturesubscriptionintendedforimportalreadysubscribedtoapu...

IT技术学习 ·2023-07-08

ORA-24050: subscribers are not supported for exception queue string

文档解释ORA-24050:subscribersarenotsupportedforexceptionqueuestringCause:AnADD_SUBSCRIBER,ALTER_SUBSCRIBER,orREMOVE_SUBSCRIBERprocedurewasissuedonaqueuethatwascreat...

IT技术学习 ·2023-07-08

ORA-24063: cannot downgrade QUEUE_TABLE that has queues with rule-based subscribers

文档解释ORA-24063:cannotdowngradeQUEUE_TABLEthathasqueueswithrule-basedsubscribersCause:Anattemptwasmadetodowngradethequeuetablewhentherewerequeuesonwhichrulebaseds...

IT技术学习 ·2023-07-08

MySQL Error number: MY-010632; Symbol: ER_NDB_SCHEMA_DISTRIBUTION_REPORTS_UNSUBSCRIBE; SQLSTATE: HY000

文档解释Errornumber:MY-010632;Symbol:ER_NDB_SCHEMA_DISTRIBUTION_REPORTS_UNSUBSCRIBE;SQLSTATE:HY000Message:NDBSchemadist:Datanode:%dreportsunsubscribefromnode%d,subs...

IT技术学习 ·2023-07-03

RxJava2的doOnSubscribe方法和doOnNext方法的理解

1.doOnSubscribe是事件被订阅之前(也就是事件源发起之前)会调用的方法，这个方法一般用于修改、添加或者删除事件源的数据流。2.doOnNext是观察者被通知之前(也就是回调之前)会调用的方法，说白了就是最终回调之前的前一个回调方法，这个方法一般做的事件类似于观察者做的事情，只是自己不是最终的回调者。（观察者...

代码星球 ·2021-02-20

观察者模式（Observer）和发布（Publish/订阅模式（Subscribe）的区别

最近在学习dubbo,学到dubbo自然要接触注册中心zookeeper，zookeeper里涉及发布和订阅问题。观察者模式之JAVA实现：JAVA设计模式之观察者模式发布订阅模式之JAVA实现：发布者订阅者模式之JAVA实现观察者模式（Observer）和发布（Publish/订阅...

代码星球 ·2020-12-09