bi应用主题的文章列表，还有bi应用的技术要点_第2页

hadoop中combiner是什么

Combiner（合并器）在Hadoop中，Combiner（合并器）是一个可选的阶段，用于优化MapReduce任务的性能。它是在Map阶段输出之后、规约（reduction）之前执行的。Combiner的作用是在Map任务的本地节点上对Map阶段的输出进行局部聚合。它接收Map任务输出的键值对，并将具有相同键的键值...

开发笔记 ·2024-01-23

linux应用有哪些

Linux是一个开源的操作系统，拥有丰富的应用软件。以下是一些常见的Linux应用：1.文字编辑器：Vim、Emacs、Nano等用于编辑文本文件。2.网页浏览器：Firefox、Chrome等用于浏览互联网网页。3.文件管理器：Nautilus、Dolphin、Thunar等用于管理文件和文件夹。4.压缩工具：tar...

开发笔记 ·2024-01-09

Reachability(判断网络是否连接)

类似于一个网络状况的探针。　　[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(reachabilityChanged:)name:kReachabilityChangedNotificationobject:nil];&nbs...

开发笔记 ·2023-10-12

Java高级编程实战（从入门到精通，详细剖析Java的高级应用）

1.Java高级编程实战的概述Java高级编程实战是一门非常复杂和高级的编程语言，需要开发者具备一定的编程经验和技能。它可以用来开发各种应用程序，包括桌面应用、Web应用、移动应用等。Java高级编程实战还具有很多优点，比如可移植性强、安全性高、性能优异等。2.Java高级编程实战的入门指南如果你想学习Java高级编程...

开发笔记 ·2023-08-15

ORA-55339: a virtual model already exists for the specified model-rulebase combination

文档解释ORA-55339:avirtualmodelalreadyexistsforthespecifiedmodel-rulebasecombinationCause:Avirtualmodelwithidenticalcomponentswasalreadypresent.Action:Chooseadiffer...

IT技术学习 ·2023-07-28

ORA-24940: invalid combination of string namespace, string presentation and string receive protocol

文档解释ORA-24940:invalidcombinationofstringnamespace,stringpresentationandstringreceiveprotocolCause:Aninvalidcombinationofnamespace,presentationandreceiveprotocol...

IT技术学习 ·2023-07-28

ORA-19955: only one open thread is allowed to change the DBID

文档解释ORA-19955:onlyoneopenthreadisallowedtochangetheDBIDCause:Theoperationfailedbecausetherewereactivethreadsinthedatabase.Themostlikelycauseisthatthedatabasecra...

IT技术学习 ·2023-07-28

ORA-39172: Cannot remap transportable tablespace names with compatibility of string.

文档解释ORA-39172:Cannotremaptransportabletablespacenameswithcompatibilityofstring.Cause:Theuserattemptedtoremapatablespacenameinatransportabletablespacejobwhenthec...

IT技术学习 ·2023-07-28

ORA-25110: NOSORT may not be used with a bitmap index

文档解释ORA-25110:NOSORTmaynotbeusedwithabitmapindexCause:AnattemptwasmadetocreateabitmapindexusingtheNOSORToption.Action:RemoveNOSORTfromtheCREATEBITMAPINDEXstatem...

IT技术学习 ·2023-07-28

ORA-14701: partition-extended name or bind variable must be used for DMLs on tables partitioned by the System method

文档解释ORA-14701:partition-extendednameorbindvariablemustbeusedforDMLsontablespartitionedbytheSystemmethodCause:Userattemptednottousepartition-extendedsyntaxforata...

IT技术学习 ·2023-07-28

ORA-56708: Could not find any datafiles with asynchronous i/o capability

文档解释ORA-56708:Couldnotfindanydatafileswithasynchronousi/ocapabilityCause:TherearenodatafileswhichareasynchronousI/Ocapable.Action:Makesureasynchronousi/oispermi...

IT技术学习 ·2023-07-26

ORA-09708: soacon: failed to bind socket to port.

文档解释ORA-09708:soacon:failedtobindsockettoport.Cause:Thebindsystemcallfailedonthesocket.Action:CheckadditionalinformationforOSerror.Tryconnectingagain.ORA-09708:...

IT技术学习 ·2023-07-26

ORA-24369: required callbacks not registered for one or more bind handles

文档解释ORA-24369:requiredcallbacksnotregisteredforoneormorebindhandlesCause:NocallbackshavebeenregisteredforoneormoreofthebindhandleswhicharepartoftheRETURNINGclau...

IT技术学习 ·2023-07-26

ORA-09802: Conversion of binary label to string failed.

文档解释ORA-09802:Conversionofbinarylabeltostringfailed.Cause:ORACLEwasunabletoconvertabinarylabeltoastring.Action:ChecktheUNIXerrornumberforapossibleoperatingsyste...

IT技术学习 ·2023-07-26

ORA-15239: allocation unit size higher than string requires RDBMS compatibility string

文档解释ORA-15239:allocationunitsizehigherthanstringrequiresRDBMScompatibilitystringCause:TheallocationunitsizerequestedexceededthelimitimposedbytheRDBMScompatibili...

IT技术学习 ·2023-07-26