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Re: InstantDB: SQL query does not run


Thomas

A 14 table join is probably going to take a while in InstantDB. Have you
checked the CPU usage to see whether it has hung or whether it's just
crunching away in the background?

Regards

Peter Hearty
Lutris Technologies UK Ltd.
-----Original Message-----
From: Thomas Vatter <thomas.vatter@blinx.de>
To: instantDB@enhydra.org <instantDB@enhydra.org>
Date: 01 July 2000 08:00
Subject: Re: InstantDB: SQL query does not run


>Hi Bill
>
>thanks for looking at the code. Yes, I did not set the join to the table
"vrnt".
>(I had checked the query before against an informix sql server and it
seemed to
>be ok.) I have added the missing join. Surprisingly the query still does
not run
>or does not come to an end.
>
>Regards
>Thomas Vatter
>
>
>Bill Karwin schrieb:
>
>> Hi Thomas,
>>
>> One observation: this is a cartesian product, because there is no join
>> condition that links vrnt with any other table.  So it might be
>> generating a result set that is larger than what you intend.  If that
>> results in a ridiculously large result set, it could be overwhelming the
>> InstantDB engine.
>>
>> Have you considered testing simpler queries with fewer tables until you
>> can build up the full 14-way join?
>>
>> Thomas Vatter wrote:
>> > from
>> >
>> >      eintr, stf, mng, knz, gfh, rstkmb, gbd, stc, rm, fchabt,
>> >      ins, arb, brb, vrnt
>> >
>> > where
>> >
>> >      dor is null and doa is null and unme <> "zxy" and
>> >      eintr.stfn = stf.stfn and
>> >      eintr.brbn = brb.brbn and
>> >      eintr.fchabtn = fchabt.fchabtn and
>> >      eintr.gbdn = gbd.gbdn and
>> >      fchabt.insn = ins.insn and
>> >      fchabt.arbn = arb.arbn and
>> >      gbd.stcn = stc.stcn and
>> >      gbd.rmn = rm.rmn and
>> >      stf.gfhn = gfh.gfhn and
>> >      stf.mngn = mng.mngn and
>> >      stf.rstkmbn = rstkmb.rstkmbn and
>> >      stf.knzn = knz.knzn
>>
>> Regards,
>> Bill Karwin
>> Application Architect - Lutris Technologies, Inc.
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