绍兴从哪里可以学到实战性的SEO?

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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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