ForeignersontheChineseclassnotes
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==========ChineseOriginal:
secondquestion
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Symptomsofacorruptedtableareusuallyaccidentalinterruptionofinquiryandyoucanseetheexampleoftheseerrors:
*"tbl_name.frm"lockedcannotbechanged.
*cannotfindthefile"tbl_name.MYI"(Errcode:###).
*fromtableprocessorsgetthewrong###(inthiscase,theerror135isanexception).
*unexpectedendoffile.
*logfiletobedestroyed.
Inthesecases,youhavetorepairthetable.myisamchkcanusuallydetectandfixmostthingswrong.
repairprocessinvolvesuptofourstages,describedbelow.Beforeyoubegin,youshouldcdtothedatabasedirectoryandfilepermissionschecklisttoensurethattheycanberunmysqldforUnixuserstoread(andyou,becauseyouneedtoaccessthefileyouarechecking).Ifitrefusestomodifyyourfiles,theymustbewrittenbyyou.
checkyourwatch
runmyisamchk*.MYIor(myisamchk-e*.MYI,ifyouhavemoretime).Use-s(silent)optionagainstunnecessaryinformation.
youhavetorepaironlythosemyisamchkreportedanerrortable.Onthistable,YSLpump,continuetothesimpleandsaferepair.
Ifyoucheck,jordanshoes,yougetstrangeerrors(suchasoutofmemoryerror),orifmyisamchkcrashes,trytherepairdifficult.
simplesecurityfixes
First,trymyisamchk-r-qtbl_name(-r-qmeans"quickrecoverypattern").Thiswillattempttorepairthedatafiledoesnottouchtheindexfile.Ifthedatafilecontainseverythingitshouldhavedatafilesandremovetheconnectionpointtotherightplace,thisshouldbeusefulandformscanberepaired.Beginrepairsnexttable.Otherwise,usethefollowingprocedure:
1.Inthedatafilebeforecontinuingtodoabackup.
2.Usemyisamchk-rtbl_name(-rmeans"recoverymode").Thiswillremovetheincorrectdatafilerecordsandtherecordshavebeendeletedandre-indexfile.
3.Ifthepreviousstepfails,usemyisamchksafe-recovertbl_name.SafeRecoverymodeusesanoldrecoverymethodtodealwithregularrecoverymodedoesnotworkafewcases(butslower).
Iftherepair,yougetstrangeerrors(suchasoutofmemoryerror),ChanelHandbags,orifmyisamchkcrashes,trytherepairdifficult.
difficulttorepair
indexfileifthefirst16Kblockisdamaged,orcontainsincorrectinformation,oriftheindexfileismissing,youshouldonlybethecase.Inthiscase,createanewindexfileisnecessary.Todosoasfollows:
1.Tomovedatafilesmoresecureplace.
2.Usethetabledescriptionfiletocreatenew(empty)dataandindexfiles:
shell>mysqldb_name
mysql>DELETEFROMtbl_name;
mysql>quit
3.theoldDatafilesarecopiedtothenewlycreateddatadocument.(Donotjustbacktotheoldfileintothenewfile;youwanttokeepacopyincasesomethinggoeswrong.)
Backtosimple,saferepair.Nowmyisamchk-r-qshouldwork.(Thisshouldnotbeaninfiniteloop).
verydifficulttorepair
onlydescriptionfilesweredestroyed,youshouldreachthisstagebefore.Thisshouldneverhappen,becausethetableiscreatedafterthedescriptorisnolongerchanged.
1.fromadescriptionoffilebackupandrecoveryandreturntothedifficultiesofrepair.Youcanalsorestoretheindexfileandreturntothesimpleandsaferepair.Thelatter,youshouldstartwithmyisamchk-r.
2.Ifyoudonothaveabackupbutknowexactlyhowthetablewascreatedinanotherdatabase,adidasshoes,createacopyofthetable.Removethenewdatafile,andthenfromtheotherdatabaseandindexfilestodescribethedestructionofthedatabase.Thisgivesyounewdescriptionandindexfiles,datafiles,butletalonestay.Backtothesimpleandsaferepairandtrytorebuildtheindexfile.morearticles
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EverymorningandeveningoutdooractivitiesthatIfarthemostanticipated,Iliketositmylittlebike,chanelbags,tothedownstairsoftheparkandkidsplay,wehavealotofmydistrictaboutbigbaby,althoughwenowalsocannotspeak,donotplaytogether,butlookedateachother,justashappy,uggshoes,andIbelievesoon,Iwillwalk,speak,andIcan,andtheygrewuptogethersmallpartnerstoplaywith,andthattimewealsolooklikeit?
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