I have a ques - say I have a table that has 10 columns. But in a simple
select query from that table, I use just 3 columns. I want to know
whether even for fetching 3 columns, read happens for all the 10 columns
and out of that the required 3 columns are returned ? ie Does the
complete row with
Satish Burnwal (sburnwal) wrote:
I have a ques - say I have a table that has 10 columns. But in a simple
select query from that table, I use just 3 columns. I want to know
whether even for fetching 3 columns, read happens for all the 10 columns
and out of that the required 3 columns are returned
In response to Satish Burnwal (sburnwal) :
I have a ques - say I have a table that has 10 columns. But in a simple
select query from that table, I use just 3 columns. I want to know
whether even for fetching 3 columns, read happens for all the 10 columns
and out of that the required 3 columns
Hi.
I need to export data from the database to external file. The difficulty is
that only data modified or added since previous export should be written to the
file.
I consider adding "modification_time" timestamp field to all the
tables that should be exported. Then I can set this field to
Thank you for the answer Grzegorz.
if you have a primary key on the table, and you should, you might get better
performance using LEFT JOIN.
Well as far as I know, the result of such JOIN is a cartezian product, which is
not exactly what I need. I need the same structure as table 'data' has.
zhong ming wu wrote:
After explicitly specfying these paths with --with-libs and
with-includes postgres configure is still choking
on readline.
Doing this is painful, but one hack you can try is pointing:
export LD_LIBRARY_PATH=/home/me/local/lib
I've used that combined with setting
A. Kretschmer wrote:
In response to Satish Burnwal (sburnwal) :
I have a ques - say I have a table that has 10 columns. But in a simple
select query from that table, I use just 3 columns. I want to know
whether even for fetching 3 columns, read happens for all the 10 columns
and out of that
On 16/04/2010 07:11, John R Pierce wrote:
Satish Burnwal (sburnwal) wrote:
I have a ques - say I have a table that has 10 columns. But in a simple
select query from that table, I use just 3 columns. I want to know
whether even for fetching 3 columns, read happens for all the 10 columns
and
In response to Raymond O'Donnell :
On a related note, what happens when you do something like this? -
select count(*)
Does any data actually get read?
No, it check's only the visibility for each record - seq-scan.
Is there any difference internally to saying count(1) instead?
On Thursday 15 April 2010 15.56:20 Jan Krcmar wrote:
i'm doing one big insert per day, and one big delete per day
anyway, i've found, this article
http://www.postgresql.org/docs/8.4/interactive/ddl-partitioning.html
could the partitioning be helpfull for this situation?
Yes, I'm quite
On Wed, Apr 14, 2010 at 8:01 AM, Jan Krcmar honza...@gmail.com wrote:
hi
i've got the database (about 300G) and it's still growing.
i am inserting new data (about 2G/day) into the database (there is
only one table there) and i'm also deleting about 2G/day (data older
than month).
the
Hi all,
I have a table with three columns: one integer and two doubles.
There are two indexes defined (one on the integer and one on one
of the doubles). This table stores 70 records, which take up
30 Mb according to pg_relation_size(), and the total relation size
is 66 Mb.
I expected the
Hi All,
For some setups reason, i started taking Hot backup. In this course I have
first issued pg_start_backup('backup') and went to the data directory for
backing up in OS format using the command tar -cf backup.tar /data . When
i issued this command , tar was generating some errors as show
2010/4/16 Peter Bex peter@xs4all.nl
Hi all,
I have a table with three columns: one integer and two doubles.
There are two indexes defined (one on the integer and one on one
of the doubles). This table stores 70 records, which take up
30 Mb according to pg_relation_size(), and the
On Fri, Apr 16, 2010 at 11:59:38AM +0200, Szymon Guz wrote:
File pages are not fully filled from the start as that could result in bad
performance of queries later.
The manual page you linked to says something else:
The fillfactor for a table is a percentage between 10 and 100.
100 (complete
.
On Fri, Apr 16, 2010 at 11:55 AM, raghavendra t
raagavendra@gmail.com wrote:
Hi All,
For some setups reason, i started taking Hot backup. In this course I have
first issued pg_start_backup('backup') and went to the data directory for
backing up in OS format using the command tar -cf
2010/4/16 Peter Bex peter@xs4all.nl
On Fri, Apr 16, 2010 at 11:59:38AM +0200, Szymon Guz wrote:
File pages are not fully filled from the start as that could result in
bad
performance of queries later.
The manual page you linked to says something else:
The fillfactor for a table is a
Hey Kretschemer, the has_table_privilege function returns true in following
situation as well which is wrong.
techdb= select pc.relname, pc.relacl from pg_class pc, pg_namespace pn
where pc.relnamespace=pn.oid and pn.nspname='techdb' and
pc.relname='techtable';
relname|
It is strange. If I remove both SELECT and INSERT then works fine but if
either of is there then it doesn't work.
techdb= SELECT has_table_privilege('user1', 'techdb.techtable', 'UPDATE,
DELETE, TRUNCATE, REFERENCES, TRIGGER');
has_table_privilege
-
t
(1 row)
techdb=
Sorry, a mistake:
Ok, I've tested the simple example of a SRF from
http://www.postgresql.org/docs/8.4/interactive/xfunc-c.html (section
34.9.10) and the application crash in the same way. When tries to
access SRF_IS_FIRSTCALL(), or any other PostgreSQL macro like
SRF_FIRST_CALL_INIT(),
On 16/04/10 10:41, Peter Bex wrote:
Hi all,
I have a table with three columns: one integer and two doubles.
There are two indexes defined (one on the integer and one on one
of the doubles). This table stores 70 records, which take up
30 Mb according to pg_relation_size(), and the total
On Thu, Apr 15, 2010 at 10:22 PM, zhong ming wu mr.z.m...@gmail.com wrote:
Dear List
I need to build a postgres on a linux machine that I don't have root
access.
I built readline from source and installed it with prefix of /home/me/local
readline library are in /home/me/local/lib and
Okay I got to know from
http://www.postgresql.org/docs/8.4/interactive/functions-info.html that the
has_table_privilege returns true if any of the listed privilege is held.
Then how can I find whether user has all the specified permissions or not?
From
On 16/04/10 16:23, A. Kretschmer wrote:
In response to Raymond O'Donnell :
On a related note, what happens when you do something like this? -
select count(*)
Does any data actually get read?
No, it check's only the visibility for each record - seq-scan.
... though in practice
Craig Ringer wrote:
I sometimes wonder if being able to store visibility info externally
to a tuple in a separate file - in condensed fixed-width form - would
be useful for performance, especially where the table has quite wide
tuples with types that are big-ish but not TOASTable. Sure, it'd
John R Pierce pie...@hogranch.com writes:
Using the include files provided with the 64bit version is giving me the
wrong Float8 type, yes, as they are the 32bit include files.
I need to build pl/java to run against the binary release of Postgres
for largely political/corporate reasons.
Tom Lane wrote:
John R Pierce pie...@hogranch.com writes:
I need to build pl/java to run against the binary release of Postgres
for largely political/corporate reasons. this is to be installable as
an addon to an existing large/complex database deployment.
Well, in that case you'd
Richard Huxton d...@archonet.com writes:
On 16/04/10 10:41, Peter Bex wrote:
Is there a way to reduce the per-tuple storage overhead?
Short answer - no.
About the only thing you could really do is rethink the table layout.
If you can put more data per row, then the fractional overhead for
Scott Mead scott.li...@enterprisedb.com writes:
Huh? This I find hard to believe. Whenever I've had problems with readline
it was actually libtermcap that was giving me a headache. Are you sure that
there's nothing in there that's pointing you to your libtermcap being
'wonky'
I think
Hi @all,
A question, found in the german PG-Forum:
is it possible to partitionate a lookup-table? What i mean is:
test=# create table foo(i int primary key);
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index foo_pkey for
table foo
CREATE TABLE
test=*# create table bla ( i int
On Fri, Apr 16, 2010 at 10:48 AM, Andreas Kretschmer
akretsch...@spamfence.net wrote:
is it possible to partitionate a lookup-table? What i mean is:
test=# create table foo(i int primary key);
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index foo_pkey for
table foo
CREATE TABLE
On Fri, Apr 16, 2010 at 10:36 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Scott Mead scott.li...@enterprisedb.com writes:
Huh? This I find hard to believe. Whenever I've had problems with
readline
it was actually libtermcap that was giving me a headache. Are you sure
that
there's nothing in
On Fri, Apr 16, 2010 at 5:41 AM, Peter Bex peter@xs4all.nl wrote:
Hi all,
I have a table with three columns: one integer and two doubles.
There are two indexes defined (one on the integer and one on one
of the doubles). This table stores 70 records, which take up
30 Mb according to
Greg Smith wrote:
If I were John, I'd be preparing to dig in on providing a complete
source build with PL/Java installed. It looks like the idea that
they'll be able to take their *existing* Solaris binaries and just add
Java on top of them is going to end up more risky than doing that.
The
John R Pierce pie...@hogranch.com writes:
Greg Smith wrote:
If I were John, I'd be preparing to dig in on providing a complete
source build with PL/Java installed. It looks like the idea that
they'll be able to take their *existing* Solaris binaries and just add
Java on top of them is
List, we need to run v8.1.11 but can not find the binaries for RedHat
Enterprise Linux 5 (CentOs 5). The sources are at
ftp://ftp-archives.postgresql.org/pub/source/ but we rather install it from the
binaries. Can you point to someplace we can get them? Already tried
rpmfind.net,
Tom Lane wrote:
Right. If you can get a consistent fileset from Bjorn in a timely
fashion, problem solved.
exactly. that is my intent. Bjorn replied to my request on hackers
last night, and 'is going to look into it'
can someone confirm, the critical files that get customized by
John R Pierce wrote:
so you're saying that building plugins to work with an existing system
is bad? then whats the point of the whole pgxs system and including
server headers in a binary release?
It's fine if your package has been setup to allow it. I bundle up stuff
on RHEL like that all
Maurício Ramos wrote:
List, we need to run v8.1.11 but can not find the binaries for RedHat
Enterprise Linux 5 (CentOs 5).
It's unlikely you specifically need 8.1.11; a later 8.1 should work
fine. See http://www.postgresql.org/support/versioning for details
about what changes between
Greg Smith wrote:
I'm not trying to criticize what you're doing, just given you a dose
of my own paranoia and preferred risk management approach for this
sort of thing. It may not actually be possible to fully follow the
unreasonable requirements you've been given and deliver something that
John R Pierce pie...@hogranch.com writes:
can someone confirm, the critical files that get customized by
./configure are
$INCLUDEDIR/pg_config.h
$INCLUDEDIR/server/pg_config.h (apparently identical)
$LIBDIR/pgxs/src/Makefile.global
I believe all of the files that get written
I have some data fields that I have summed, grouped by a date field.
The sums are different. How can I then calculate the average value for
those sums? Everything I've tried errors out with something along the
lines of using agregates where I can't, or for using multiple values
where that is not
semi-ambivalent wrote on 16.04.2010 19:57:
I have some data fields that I have summed, grouped by a date field.
The sums are different. How can I then calculate the average value for
those sums? Everything I've tried errors out with something along the
lines of using agregates where I can't, or
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