Re: Plans for solving the VACUUM problem

On Thu, 17 May 2001, Tom Lane wrote:

>
> We will also want to look at upgrading the non-btree index types to allow
> concurrent operations. This may be a research problem; I don't expect to
> touch that issue for 7.2. (Hence, lazy VACUUM on tables with non-btree
> indexes will still create lockouts until this is addressed. But note that
> the lockout only lasts through step B of the VACUUM, not the whole thing.)

am I right you plan to work with GiST indexes as well ?
We read a paper "Concurrency and Recovery in Generalized Search Trees"
by Marcel Kornacker, C. Mohan, Joseph Hellerstein
(http://citeseer.nj.nec.com/kornacker97concurrency.html)
and probably we could go in this direction. Right now we're working
on adding of multi-key support to GiST.

btw, I have a question about function gistPageAddItem in gist.c
it just decompress - compress key and calls PageAddItem to
write tuple. We don't understand why do we need this function -
why not use PageAddItem function. Adding multi-key support requires
a lot of work and we don't want to waste our efforts and time.
We already done some tests (gistPageAddItem -> PageAddItem) and
everything is ok. Bruce, you're enthuasistic in removing unused code :-)

>
> regards, tom lane
>
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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