文档解释ORA-07251:spcre:semgeterror,couldnotallocateanysemaphores.Cause:Semgetfailedtoevenallocateasinglesemaphore.Eithertheyareallinuseorthesystemisnotconfiguredto...

文档解释ORA-07250:spcre:semgeterror,unabletogetfirstsemaphoreset.Cause:Anerroroccurredwhentryingtogetfirstsemaphoreset.Action:Checkerrno.Verifythatsystemisconfigure...

文档解释ORA-09768:osnmgetmsg:couldnotreadamessageCause:Themsg_receivesystemcallreturnedafailurecodewhilewaitingforamessageintheMachdriver.Action:Internalerror.Conta...

文档解释ORA-09877:sstascre:shmgeterror,unabletogetasharedmemorysegment.Cause:Errorinshmget.Action:Checkerrnoreturned.Verifythatenoughsharedmemoryisavailableonthesys...

文档解释ORA-09773:osnmgetdatmsg:messagefromhosthadincorrectmessagetypeCause:TheMachdriverreceivedamessagehavinganunrecognizablemessagetype.Action:Internalerror.Cont...

文档解释ORA-07279:spcre:semgeterror,unabletogetfirstsemaphoreset.Cause:Anerroroccurredwhentryingtogetfirstsemaphoreset.Action:Checkerrno.Verifythatsystemisconfigure...

文档解释ORA-07252:spcre:semgeterror,couldnotallocatesemaphores.Cause:Semgetsystemcallreturnedanerror.Possibleresourcelimitproblem.Action:Checkerrno.Verifythatenough...

来自：https://blog.csdn.net/dongtingzhizi/article/details/12068205 operator模块提供的itemgetter函数用于获取对象的哪些维的数据，参数为一些序号，看下面例子：importoperatora=[1,2,3]b=operator.item...

注意：前面讲到的各种操作都是一次http请求操作一条数据，如果想要操作多条数据就会产生多次请求，所以就有了mget和bulk批量操作，mget和bulk批量操作是一次请求可以操作多条数据 1、mget批量操作（查询）批量操作(同一个索引同一个表里的批量查询)说明：#mget批量操作(同一个表里的批量查询)GE...

itemgetter函数：对字典列表进行多键排序1fromoperatorimportitemgetter23list_people=[4{'name':'Mike','age':22,'score':90},5{'name':'Alice','age':22,'score':90},6{'name':'Lee','a...

问题：根据某个或某几个字典字段来排序Python列表answer: 通过使用operator模块的itemgetter函数，可以非常容易的排序这样的数据结构eg:　　rows=[　　{'fname':'Brian','lname':'Jones','uid':1003},　　{'fname':'David',...