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python 快速创建字典 fromkes()

作用：快速创建字典特点：共用valueseq=['google','ie','firefox']#seq为可迭代对象（str,list,tuple,dict,set）dic=dict.fromkeys(seq)print(dic)#{'google':None,'ie':None,'firefox':None}dic2...

开发笔记 ·2024-08-31

create pfile from spfile;

sql>createpfilefromspfile;生成的文件在$ORACLE_HOME/dbs/下边和spfile在同一个目录下但是名字已经变成了init$oracle_sid.ora比如我的数据库叫orcl,那么生成的文件名就中：initorcl.ora============初始化参数===在$ORACLE...

开发笔记 ·2024-06-21

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections

最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式：打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...

开发笔记 ·2024-04-29

ORA-25228: timeout or end-of-fetch during message dequeue from string.string

文档解释ORA-25228:timeoutorend-of-fetchduringmessagedequeuefromstring.stringCause:User-specifieddequeuewaittimehaspassedortheendofthequeuehasbeenreachedbutnomessage...

IT技术学习 ·2023-07-28

ORA-51704: Error string received from XPath engine

文档解释ORA-51704:ErrorstringreceivedfromXPathengineCause:AnerrorwasreceivedfromtheXPathlibraryduringanXPathoperation.Action:Checkxmlerr.htounderstandthecauseofthee...

IT技术学习 ·2023-07-28

ORA-48938: View select column count differs from select alias list

文档解释ORA-48938:ViewselectcolumncountdiffersfromselectaliaslistCause:Theviewaliaslisthasadifferentnumberoffieldsthantheselectlist”Action:Changethealiaslisto...

IT技术学习 ·2023-07-28

ORA-32310: object materialized views must select from an object table

文档解释ORA-32310:objectmaterializedviewsmustselectfromanobjecttableCause:Anattemptwasmadetocreateanobjectmaterializedviewwhosedefinitionquerydidnotselectfromanobje...

IT技术学习 ·2023-07-28

ORA-22905: cannot access rows from a non-nested table item

文档解释ORA-22905:cannotaccessrowsfromanon-nestedtableitemCause:attempttoaccessrowsofanitemwhosetypeisnotknownatparsetimeorthatisnotofanestedtabletypeAction:useCAST...

IT技术学习 ·2023-07-28

ORA-46086: Cannot detach from a direct-login XS session

文档解释ORA-46086:Cannotdetachfromadirect-loginXSsessionCause:AnattemptwasmadetodetachfromanXSsessioncreatedbyadirectpasswordlogin.Action:TodetachanddestroytheXSses...

IT技术学习 ·2023-07-28

ORA-28512: cannot get data dictionary translations from string

文档解释ORA-28512:cannotgetdatadictionarytranslationsfromstringCause:ORACLEwasunabletoretrievedatadictionarytranslationinformationforthenon-Oraclesystemconnectedthr...

IT技术学习 ·2023-07-28

ORA-19511: Error received from media manager layer, error text: string

文档解释ORA-19511:Errorreceivedfrommediamanagerlayer,errortext:stringCause:AnerroroccurredinthemediamanagementsoftwarewhichislinkedwiththeOracleservertoperformbacku...

IT技术学习 ·2023-07-27

ORA-25241: cannot change correlation ID from string to string without FIRST_MESSAGE option

文档解释ORA-25241:cannotchangecorrelationIDfromstringtostringwithoutFIRST_MESSAGEoptionCause:AnattemptwasmadetochangethecorrelationIDwhileusingtheNEXT_MESSAGEorNEXT...

IT技术学习 ·2023-07-27

ORA-19036: Invalid query result set in newContextFromHierarchy()

文档解释ORA-19036:InvalidqueryresultsetinnewContextFromHierarchy()Cause:TheresultsetofthequeryusedinthenewContextFromHierarchy()doesnothavethesamepropertyastheresul...

IT技术学习 ·2023-07-27

ORA-19754: error reading from change tracking file

文档解释ORA-19754:errorreadingfromchangetrackingfileCause:AnI/Oerroroccurredwhilereadingfromthechangetrackingfile.Action:Therewillbeothermessagesontheerrorstackthat...

IT技术学习 ·2023-07-27

ORA-08238: smsfre: cannot detach from SGA

文档解释ORA-08238:smsfre:cannotdetachfromSGACause:Then_coresystemcallfailedwhiledetachingfromtheSGA.Action:ChecknCXerror,andcontactyourcustomersupportrepresentative...

IT技术学习 ·2023-07-27