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pgsql-general-digest      Thursday, July 8 1999      Volume 01 : Number 381



Index:

Re: [HACKERS] RE: [GENERAL] Transaction logging
unsubscribe
Does Apache has PostgreSQL module?
Re: [GENERAL] Does Apache has PostgreSQL module?
User priveledges
just little BUG
marino.lionello@bluewin.ch
Re: [GENERAL] Problems with inequalities on numeric fields in 6.5
[none]

----------------------------------------------------------------------

Date: Wed, 7 Jul 1999 23:25:24 -0400 (EDT)
From: Bruce Momjian <maillist@candle.pha.pa.us>
Subject: Re: [HACKERS] RE: [GENERAL] Transaction logging

Updated TODO:

* Transaction log, so re-do log can be on a separate disk by
  with after-row images


> > Added to TODO:
> >
> >     * Transaction log, so re-do log can be on a separate disk by
> >       logging SQL queries, or before/after row images
> >
> I would drop the "log SQL queries idea".
> No need to log before row images eighter, since this is the
> current state of the row during rollforward.
> (For asserts a checksum of the before image would be sufficient,
> but IMHO not necessary.)
>
> I suggest:
>     * Transaction log that stores after row (or even only column)
> images,
>       which can be put on a separate disk to allow rollforward after
>       a restore of a server.
>
> The "restore of a server" is a main problem here, but I suggest the
> following
> additional backup tool, that could be used for a "restore of a server"
> which could then be used for a rollforward and would also be a lot faster
> than a pg_dump:
>
> 1. place a vacuum lock on db (we don't want vacuum during backup)
> 2. backup pg_log using direct file access (something like dd bs2k)
> 3. backup the rest in any order (same as pg_log)
> 4. release vacuum lock
>
> If this was restored, this should lead to a consistent database,
> that has all transactions after the start of backup rolled back.
>
> Is there a nono in this idea? I feel it should work.
> A problem is probably, that the first to touch a row with a committed update
> stores this info in that row. There would probably need to be an undo for
> this
> after restore of the physical files.
>
> Andreas
>
>
>


- --
  Bruce Momjian                        |  http://www.op.net/~candle
  maillist@candle.pha.pa.us            |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

------------------------------

Date: Thu, 08 Jul 1999 07:49:59 +0200
From: Leszek Rychlewski <leszek@bioinfobank.com>
Subject: unsubscribe

unsubscribe

------------------------------

Date: Thu, 08 Jul 1999 01:18:44 PDT
From: Albert Chen <chen6178@hotmail.com>
Subject: Does Apache has PostgreSQL module?

Hi,

I know there is a ApacheMysql module. Has ApachePostgres module?

- -Albert


______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com

------------------------------

Date: Thu, 8 Jul 1999 13:07:12 +0400 (MSD)
From: Oleg Broytmann <phd@emerald.netskate.ru>
Subject: Re: [GENERAL] Does Apache has PostgreSQL module?

On Thu, 8 Jul 1999, Albert Chen wrote:
> I know there is a ApacheMysql module. Has ApachePostgres module?

   Do you mean postgres authentication module? It is called mod_auth_pgsql,
and you can hunt for this on http://modules.apache.org. Works pretty fine
for me.

> -Albert

Oleg.
- ----
    Oleg Broytmann     http://members.xoom.com/phd2/     phd2@earthling.net
           Programmers don't die, they just GOSUB without RETURN.

------------------------------

Date: Thu, 08 Jul 1999 09:21:12 -0500
From: Bob Kruger <bkruger@mindspring.com>
Subject: User priveledges

I have what may be a fairly simple question for the group, but for the life
of me I missed it in the documentation.

In writing some perl cgi scripts for postgres, I found that I would get an
error message if a user without certain priveledges tried to do a select,
insert, delete or whatever.

What I would like to do is a quick scan prior to executing a perl script
that would look at the user and see if they have the priveledge for the
action they are about to attempt.  An example would be that prior to a
screen coming up that handles deletions, a query is made to see if the user
even has this priveledge and the result is somehow captured so that they
can either go on to a subroutine generating a HTML screen for deletion or a
subroutine informing them they do not have the correct priveledge status,
etc....

Any hints?

Regards - Bob Kruger

------------------------------

Date: Thu, 8 Jul 1999 17:16:10 +0200
From: "Jonathan davis" <haj@idianet.net>
Subject: just little BUG

hello all

normaly a UNIQUE PRIMARY KEY is unique but
when you use a heritage, you can insert a duplicate key !!!!

------------------------------

Date: Thu, 08 Jul 1999 17:25:13 +0200
From: Marino Lionello <marino.lionello@bluewin.ch>
Subject: marino.lionello@bluewin.ch

unsubscribe

------------------------------

Date: Thu, 08 Jul 1999 11:44:32 -0300
From: Martin Weinberg <weinberg@osprey.phast.umass.edu>
Subject: Re: [GENERAL] Problems with inequalities on numeric fields in 6.5

Bruce Momjian wrote on Wed, 07 Jul 1999 12:29:13 EDT
>> Thanks, Bruce!
>>
>> Yes, I tried the latter query and it's the same:
>>
>> --------------------------------------------------
>>
>> lmc>:float4;
>> NOTICE:  QUERY PLAN:
>>
>> Aggregate  (costb349.97 rowsx8100 width
>>   ->  Index Scan using j on lmctot  (costb349.97 rowsx8100 width
>>
>> EXPLAIN
>>
>> --------------------------------------------------
>> I've tried all permutations of the conversions in the ranges with
>> similar results (and vacuum analyzed several times as well as
>> dumped and reloaded and reloaded from scracth).  We have
>> a larger database with 20M rows which has a similar behavior.
>>
>> There are 7092894 rows in database "lmc".  So:
>>
>> (3.5-3.4)/(99.999-2.731) >>
>> A clue?
>
>I have just fixed a problem with index size estimates.  Try adding
>#include <math.h> to the top of backend/optimizer/util/plancat.c.  That
>may fix the estimated number of tuples returned.  However, it don't
>think you are going to get better performance, since you are already
>using the index in the above case.  The only big win I can think of is
>to use CLUSTER on that field.  That should speed things up quite a bit.
>

Hi Bruce,

Ok.  Sorry about the delay.

I added the math.h but that doesn't seem to change the
query plan output.

I then dropped all the indices, made a new one on three of the
variables and clustered:

create index m_col on lmctot using btree (j_m, h_m, k_m);
cluster m_col on lmctot;
vacuum analyze;

where the j_m, h_m, k_m are three float4 fields.

The cluster took about 18 hours on my 7.1 million records
(this is a dual 450Mhz Xeon Linux box).  Not sure why
this was so slow.

Anyway, this *hugely* improved queries of form:

select count(*) from lmctot where j_m>3.4::float4 and j_m<3.5:

although the explain query plan output is identical.  However
using h_m or k_m (not the first variable in the index) appears
to be doing a sequential scan.  Is that right?

I then made indices on h_m and k_m, vacuum analyzed and tried
again, but got identical performance.  If this is the way
it is, so be it, but I have the feeling that something is
not working properly.

Any ideas?

Again, with _heaps_ of thanks,

- --Martin



Martin Weinberg                      Phone: (413) 545-3821
Dept. of Physics and Astronomy       FAX:   (413) 545-2117/0648
530 Graduate Research Tower
University of Massachusetts
Amherst, MA  01003-4525

------------------------------

Date: Thu, 8 Jul 1999 16:13:54 -0500 (COT)
From: "Moises Rincon D'Hoyos" <moi-rinc@demy.uniandes.edu.co>
Subject: [none]

subscribe
end

------------------------------

End of pgsql-general-digest V1 #381
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