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使用putty远程登录Ubuntu时，报Network error:Connection refused错误及解决

putty远程登录Ubuntu，弹出Networkerror:Connectionrefused的错误提示框，就是因为Ubuuntu没有安装ssh服务。执行命令：sudoapt-getinstallopenssh-server1然后打开putty，在HostName（orIPaddress）输入Ubuntu的IP地址，...

开发笔记·2024-08-20

Entity Framework常用的查询方式

【LINQtoEntities】LINQ（语言集成查询）是从VisualStudio2008开始引入的功能，在C#中可以使用LINQ查询不同的数据源。LINQ-to-Entities在entityframework上的操作，可以访问底层数据库中的数据。以下是LINQ查询语法示例：publiccourseFindWith...

开发笔记·2024-08-10

springBoot required a bean of type org.springframework.data.redis.core.RedisTemplate

springBoot启动报错： requiredabeanoftype'org.springframework.data.redis.core.RedisTemplate' 产生这个问题的原因是：系统启动的时候没有扫描到这个RedisT...

开发笔记·2024-07-11

ORA-31673: worker process interrupt for normal exit by master process

文档解释ORA-31673:workerprocessinterruptfornormalexitbymasterprocessCause:Aworkerprocesswasrequestedtocleanupandexitbecausethemasterprocessisdoinganormalexit.Action...

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-55451: multi-parent workspaces not supported with RDF

文档解释ORA-55451:multi-parentworkspacesnotsupportedwithRDFCause:Anattemptwasmadetousemulti-parentworkspaceswithResourceDefinitionFramework(RDF)data.Action:NoneORA-...

IT技术学习·2023-07-28

ORA-39125: Worker unexpected fatal error in string while calling string [string]

文档解释ORA-39125:Workerunexpectedfatalerrorinstringwhilecallingstring[string]Cause:AnunhandledexceptionwasdetectedinternallywithintheworkerprocessfortheDataPumpjob...

IT技术学习·2023-07-28

ORA-16589: Data Guard broker detected network transfer error

文档解释ORA-16589:DataGuardbrokerdetectednetworktransfererrorCause:TheDataGuardbrokerdetectedanerrorwhiletransferringdatafromonedatabasetoanother.Thismayhappenwhen:...

IT技术学习·2023-07-28

ORA-40273: invalid model type string for Adaptive Bayes Network algorithm

文档解释ORA-40273:invalidmodeltypestringforAdaptiveBayesNetworkalgorithmCause:Thevalidvaluesfortheabns_model_typesettingsare:abns_multi_feature,abns_single_feature,...

IT技术学习·2023-07-27

ORA-15511: cannot process workload capture because no user sessions were recorded

文档解释ORA-15511:cannotprocessworkloadcapturebecausenousersessionswererecordedCause:Nousersessionswererecordedinthegivenworkloadcapture.Processingthiscapturefailed...

IT技术学习·2023-07-27

ORA-39106: Worker process string failed during startup. Worker error:

文档解释ORA-39106:Workerprocessstringfailedduringstartup.Workererror:Cause:Theworkerprocesswhosenameislistedfailedduringstartup.Action:Refertoanyfollowingerrormessa...

IT技术学习·2023-07-26

ORA-27609: Smart I/O failed due to a network error to the cell “string”. error code “string”, “string”

文档解释ORA-27609:SmartI/Ofailedduetoanetworkerrortothecell“string”.errorcode“string”,“string”Cause:Thespecifiedcellcouldnotbeco...

IT技术学习·2023-07-26

ORA-06817: TLI Driver: could not read the Novell network address

文档解释ORA-06817:TLIDriver:couldnotreadtheNovellnetworkaddressCause:Thefile$ORACLE_HOME/spx/addresscouldnotbeopenedforreadingandwriting.Action:MakesureORACLE_HOMEi...

IT技术学习·2023-07-26

ORA-15551: workload replay client cannot connect to database server

文档解释ORA-15551:workloadreplayclientcannotconnecttodatabaseserverCause:Theserverconnectionidentifierwasinvalid.Action:Restarttheclientwithcorrectserverconnectioni...

IT技术学习·2023-07-26

ORA-55450: continually refreshed workspaces not supported with RDF

文档解释ORA-55450:continuallyrefreshedworkspacesnotsupportedwithRDFCause:AnattemptwasmadetousecontinuallyrefreshedworkspaceswithResourceDefinitionFramework(RDF)data...

IT技术学习·2023-07-26