Re: tsearch2 and gist index bloat

On Thu, 6 Nov 2003, George Essig wrote:

> Thanks for the reply. For this project, I can update the data and reindex during off-peak hours.
> I was just surprised to see the size of the index double after heavy write activity.
>

This is not tsearch specific problem. It was discussed several times, ]
see index bloat subject in archives.

Oleg

> George Essig
>
> --- "Joshua D. Drake" <jd(at)commandprompt(dot)com> wrote:
> > Hello,
> >
> > I don't know if you can do this with a gist index but try using the
> > REINDEX command.
> >
> > J
> >
> >
> > George Essig wrote:
> >
> > >
> > > --- George Essig <george_essig(at)yahoo(dot)com> wrote:
> > >
> > >>I have installed tsearch2 and have noticed that the gist index used to do searches grows and
> > >>grows
> > >>as I update rows, delete rows, or run VACUUM FULL ANALYZE. Below are some details:
> > >>
> > >
> > >
> > > ....
> > >
> > >
> > >>There are 110,873 rows in this table and 13398 unique words indexed by ts_in. Using oid2name,
> > I
> > >>monitored the size of the index ts_in as I performed different operations:
> > >>
> > >>154 MB After the index was created.
> > >>190 MB After updating 40,422 rows.
> > >>243 MB After VACUUM FULL
> > >>275 MB After deleting 40,422 rows & again VACUUM FULL
> > >>
> > >
> > >
> > > Sorry, I mis-reported the index sizes. They are about 1/10 the size:
> > >
> > > 15 MB After the index was created.
> > > 19 MB After updating 40,422 rows.
> > > 24 MB After VACUUM FULL
> > > 27 MB After deleting 40,422 rows & again VACUUM FULL
> > >
> > > I still have a problem that the index size grows and grows and eventually searches slow to a
> > > crawl.
> > >
> > > George Essig
> > >
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83