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python numpy nonzero 函数(方法)介绍及使用

pythonnumpynonzero函数(方法)介绍及使用Returntheindicesoftheelementsthatarenon-zero.Returnsatupleofarrays,oneforeachdimensionof`a`,containingtheindicesofthenon-zeroelemen...

开发笔记 ·2024-09-05

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-24303: call not supported in non-deferred linkage

文档解释ORA-24303:callnotsupportedinnon-deferredlinkageCause:Oneofthecallsthatissupportedindeferredmodelinkageexclusivelywasinvokedwhentheclientwaslinkednon-deferre...

IT技术学习 ·2023-07-28

ORA-24053: PRIMARY_INSTANCE and SECONDARY_INSTANCE must be non-negative

文档解释ORA-24053:PRIMARY_INSTANCEandSECONDARY_INSTANCEmustbenon-negativeCause:OneofPRIMARY_INSTANCEorSECONDARY_INSTANCEwasnegative.Action:Specifynon-negativeintege...

IT技术学习 ·2023-07-28

ORA-30996: Streams operations over non-existent stream

文档解释ORA-30996:Streamsoperationsovernon-existentstreamCause:ThestreampassedisNULLorinvalid.Action:Checktheinputparameters.OTRA-30996:Streamsoperationsovernon-exi...

IT技术学习 ·2023-07-28

ORA-25302: Operation not possible for non-buffered queue string

文档解释ORA-25302:Operationnotpossiblefornon-bufferedqueuestringCause:Lastenqd/ackdmessageisonlysupportedforbufferedqueuesAction:Theoperationisnotsupported.ORA-2530...

IT技术学习 ·2023-07-28

ORA-28509: unable to establish a connection to non-Oracle system

文档解释ORA-28509:unabletoestablishaconnectiontonon-OraclesystemCause:Initializationofadatabaselinktoanon-OraclesystemfailedtoconnecttotheHeterogeneousServicesagent...

IT技术学习 ·2023-07-28

ORA-42297: cannot drop a schema synonym for a schema of a user who is currently connected

文档解释ORA-42297:cannotdropaschemasynonymforaschemaofauserwhoiscurrentlyconnectedCause:Anattemptwasmadetodropaschemasynonymforaschemaofauserwhowasloggedon.Action:M...

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-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-42301: definition of an Editioning view may not refer to a synonym

文档解释ORA-42301:definitionofanEditioningviewmaynotrefertoasynonymCause:AnattemptwasmadetocreateanEditioningviewreferringtoasynonym,whichisnotsupported.Action:Dono...

IT技术学习 ·2023-07-28

ORA-25252: listen failed, the address string is a non-persistent queue

文档解释ORA-25252:listenfailed,theaddressstringisanon-persistentqueueCause:Anon-persistentqueuewasspecifiedasanaddressforanagentintheLISTENcall.Action:Specifyanorma...

IT技术学习 ·2023-07-28

ORA-24007: invalid value string, MAX_RETRIES should be non-negative integer

文档解释ORA-24007:invalidvaluestring,MAX_RETRIESshouldbenon-negativeintegerCause:AninvalidvaluewasspecifiedforMAX_RETRIES.Action:Specifyanon-negativeinteger.ORA-240...

IT技术学习 ·2023-07-28

ORA-29790: Cannot change user session parameters for a non-user session

文档解释ORA-29790:Cannotchangeusersessionparametersforanon-usersessionCause:Anattemptwasmadetochangeusersessionparametersforanon-usersession.Action:Executetheoperat...

IT技术学习 ·2023-07-27

ORA-24775: cannot prepare or commit transaction with non-zero lock value

文档解释ORA-24775:cannotprepareorcommittransactionwithnon-zerolockvalueCause:Anattemptwasmadetodetachthetransactionwithanon-zerolockvalue.Action:Detachthetransactio...

IT技术学习 ·2023-07-27