Re: "Sending data" status

["Gerald L. Clark" <gerald_clark@xxxxxxxxxxxxxxxxxxx>]

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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