4.删除一个列族
theperformanceoflocalsearchinexchangeserver2007issignificantlybetterthaninexchange2003.searchresultsarereturnedwithinseconds,andthesearchindexisalsotypicallyupdatedwithinsecondsafteramessageiscreated.theclasswillbeusedtomigrateexistingcontentinthedatabasetothenewschema,andtheseedmethodwillbecalledtoprovideanopportunitytoupdatetheexistingdatabaserecords.inlisting15-5,youcanseehowihaveusedtheseedmethodtosetadefaultvalueforthenewcitypropertyiaddedtotheappuserclass.(ihavealsoupdatedtheclassfiletoreflectmyusualcodingstyle.)thedatabaseschemawillbemodified,andthecodeintheconfiguration.seedmethodwillbeexecuted.theexistinguseraccountswillhavebeenpreservedandenhancedwithacityproperty(whichisettoparisintheseedmethod).
5.删除一个表
首先把表修改为disable。
hbase(main):020:0>disable’stu’0row(s)in2.3150seconds
之后删除一个表。
hbase(main):021:0>drop’stu’0row(s)in1.2820seconds
6.查询表是否存在
crontab(1)crontab(1)namecrontab-maintaincrontabfilesforindividualusers(isccronv4.1)synopsiscrontab[-uuser]filecrontab[-uuser][-l|-r|-e][-i][-s]descriptioncrontabistheprogramusedtoinstall,deinstallorlistthetablesusedtodrivethecron(8)daemoninisccron.eachusercanhavetheirowncrontab,andthoughthesearefilesin/var/spool/,theyarenotintendedtobeediteddirectly.forselinuxinmlsmodecanbeevenmorecrontabs-foreachrange.formoreseeselinux(8).ifthecron.allowfileexists,thenyoumustbelistedthereininordertobeallowedtousethiscommand.ifthecron.allowfiledoesnotexistbutthecron.denyfiledoesexist,thenyoumustnotbelistedinthecron.denyfileinordertousethiscommand.ifneitherofthesefilesexists,onlythesuperuserwillbeallowedtousethiscommand.options-uitspecifiesthenameoftheuserwhosecrontabistobetweaked.ifthisoptionisnotgiven,crontabexamines"your"crontab,i.e.,thecrontabofthepersonexecutingthecommand.notethatsu(8)canconfusecrontabandthatifyouarerunninginsideofsu(8)youshouldalwaysusethe-uoptionforsafety’ssake.thefirstformofthiscommandisusedtoinstallanewcrontabfromsomenamedfileorstandardinputifthepseudo-filename"-"isgiven.-lthecurrentcrontabwillbedisplayedonstandardoutput.-rthecurrentcrontabwillberemoved.-ethisoptionisusedtoeditthecurrentcrontabusingtheeditorspecifiedbythevisualoreditorenvironmentvariables.afteryouexitfromtheeditor,themodifiedcrontabwillbeinstalledautomatically.-ithisoptionmodifiesthe-roptiontoprompttheuserfora’y/y’responsebeforeactuallyremovingthecrontab.-sitwillappendthecurrentselinuxsecuritycontextstringasanmls_levelsettingtothecrontabfilebeforeediting/replace-mentoccurs-seethedocumentationofmls_levelincrontab(5).seealsocrontab(5),cron(8)files/etc/cron.allow/etc/cron.denystandardsthecrontabcommandconformstoieeestd1003.2-1992(‘‘posix’’).thisnewcommandsyntaxdiffersfrompreviousversionsofvixiecron,aswellasfromtheclassicsvr3syntax.diagnosticsafairlyinformativeusagemessageappearsifyourunitwithabadcommandline.authorpaulvixie4thberkeleydistribution16januar2007crontab(1)cronjobscanbeallowedordisallowedforindividualusers,asspecifiedinthefilescron.allowandcron.deny,locatedinthedirectory/etc.ifthecron.allowfileexists,ausermustbelistedthereinordertobeallowedtouseagivencommand.ifthecron.allowfiledoesnotexistbutthecron.denyfiledoes,thenausermustnotbelistedthereinordertouseagivencommand.ifneitherofthesefilesexists,onlythesuperuserwillbeallowedtouseagivencommand.anotheroptionisusingpam(pluggableauthenticationmodule)authenticationtosetupuserswhomayormaynotusecrontabandsystemcronjobs,asconfiguredin/etc/cron.d/.
-2147417843(8001010d)anoutgoingcallcannotbemadesincethe
applicationisdispatchinganinput-synchronous
call.
-2147417842(8001010e)theapplicationcalledaninterfacethatwas
marshalledforadifferentthread.
-2147417841(8001010f)coinitializehasnotbeencalledonthecurrent
thread.
-2147417840(80010110)theversionofoleontheclientandserver
machinesdoesnotmatch.
-2147417839(80010111)olereceivedapacketwithaninvalidheader.
-2147417838(80010112)olereceivedapacketwithaninvalidextension.
-2147417837(80010113)therequestedobjectorinterfacedoesnotexist.
-2147417836(80010114)therequestedobjectdoesnotexist.
-2147417835(80010115)olehassentarequestandiswaitingfora
reply.
-2147417834(80010116)oleiswaitingbeforeretryingarequest.
-2147417833(80010117)callcontextcannotbeaccessedaftercall
completed.
-2147417832(80010118)impersonateonunsecuredcallsisnotsupported.
-2147417831(80010119)securitymustbeinitializedbeforeany
interfacesaremarshalledorunmarshalled.it
cannotbechangedonceinitialized.
-2147417830(8001011a)nosecuritypackagesareinstalledonthis
machineortheuserisnotloggedonorthereare
nocompatiblesecuritypackagesbetweenthe
clientandserver.
-2147417829(8001011b)accessisdenied.
-2147417828(8001011c)remotecallsarenotallowedforthisprocess.
-2147417827(8001011d)themarshalledinterfacedatapacket(objref)has
aninvalidorunknownformat.
-2147352577(8001ffff)aninternalerroroccurred.
-2146893823(80090001)baduid.
-2146893822(80090002)badhash.
-2146893821(80090003)badkey.
-2146893820(80090004)badlength.
-2146893819(80090005)baddata.
-2146893818(80090006)invalidsignature.
-2146893817(80090007)badversionofprovider.
-2146893816(80090008)invalidalgorithmspecified.
-2146893815(80090009)invalidflagsspecified.
-2146893814(8009000a)invalidtypespecified.
-2146893813(8009000b)keynotvalidforuseinspecifiedstate.
-2146893812(8009000c)hashnotvalidforuseinspecifiedstate.
-2146893811(8009000d)keydoesnotexist.
-2146893810(8009000e)insufficientmemoryavailablefortheoperation.
-2146893809(8009000f)objectalreadyexists.
-2146893808(80090010)accessdenied.
-2146893807(80090011)objectwasnotfound.
-2146893806(80090012)dataalreadyencrypted.
-2146893805(80090013)invalidproviderspecified.
-2146893804(80090014)invalidprovidertypespecified.
-2146893803(80090015)provider'spublickeyisinvalid.
-2146893802(80090016)keysetdoesnotexist.
-2146893801(80090017)providertypenotdefined.
-2146893800(80090018)providertypeasregisteredisinvalid.
-2146893799(80090019)thekeysetisnotdefined.
-2146893798(8009001a)keysetasregisteredisinvalid.
-2146893797(8009001b)providertypedoesnotmatchregisteredvalue.
-2146893796(8009001c)thedigitalsignaturefileiscorrupt.
-2146893795(8009001d)providerdllfailedtoinitializecorrectly.
-2146893794(8009001e)providerdllcouldnotbefound.
-2146893793(8009001f)thekeysetparameterisinvalid.
-2146893792(80090020)aninternalerroroccurred.
-2146893791(80090021)abaseerroroccurred.
-2146762751(800b0001)thespecifiedtrustproviderisnotknownonthis
system.
-2146762750(800b0002)thetrustverificationactionspecifiedisnot
supportedbythespecifiedtrustprovider.
-2146762749(800b0003)theformspecifiedforthesubjectisnotone
supportedorknownbythespecifiedtrust
provider.
-2146762748(800b0004)thesubjectisnottrustedforthespecified
action.
-2146762747(800b0005)errorduetoprobleminasn.1encodingprocess.
-2146762746(800b0006)errorduetoprobleminasn.1decodingprocess.
-2146762745(800b0007)reading/writingextensionswhereattributesare
appropriate,andvisaversa.
-2146762744(800b0008)unspecifiedcryptographicfailure.
-2146762743(800b0009)thesizeofthedatacouldnotbedetermined.
-2146762742(800b000a)thesizeoftheindefinite-sizeddatacouldnot
bedetermined.
-2146762741(800b000b)thisobjectdoesnotreadandwriteself-sizing
本文来自电脑杂谈，转载请注明本文网址：
http://www.pc-fly.com/a/jisuanjixue/article-133528-5.html
根系统程序卸载程序下载
都是硬盘分区 C盘和D盘到底有什么区别？
全国计算机二级c语言考试题库 办公自动化培训哪家好
存款基准利率变大 逾期付款的利息如何计算？
航行自由只是美国霸权的一种借口