You are joining 5 tables with an OR on only two relations.
Give it a year !!
Surat Singh Bhati wrote:
>
> If I run the following query , mysql server process hangs forever and
> it shows the "Sending data" status.
>
> select Count(*) from
> Registration,Candidates,CompanyJobs,Resumes,CandQual
> where
> CompanyJobs.qualcode=Candidates.qualcode
> or CompanyJobs.qualcode=CandQual.qualcode
>
> Below the explain:
>
> EXPLAIN
> select Count(*) from
> Registration,Candidates,CompanyJobs,Resumes,CandQual
> where
> CompanyJobs.qualcode=Candidates.qualcode
> or CompanyJobs.qualcode=CandQual.qualcode LIMIT 0, 30
>
>
> table type possible_keys key key_len ref rows Extra
> Registration index RIMARY 8 5056 Using index
> Resumes index SpCode 2 5087 Using index
> CompanyJobs ALL Qualcode 268
> Candidates ALL QualCode 4718
> CandQual ALL Qualcode 9027 where used
>
> Server version 3.23.33-log
>
> My talbes having indexed on "Qualcode" but EXPLAIN shows that it is not
> using the same.
>
> I can run the query
> select Count(*) from
> Registration,Candidates,CompanyJobs,Resumes,CandQual
> without where clause.
>
> Please suggest me the solution, I have enogh free disk and RAM.
>
> Please reply me on my ID, I have not subscribed to the list.
>
> Thanks
>
> -Surat Singh Bhati
>
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