Hi,
I do have a query which make use of the results of an aggregate
function (for example bit_or) several times in the output column list
of the SELECT clause, does PostgreSQL simply execute the aggregate
function only once and provide the output to the other calls to the
same aggregate function.
H
On Mon, Aug 10, 2009 at 7:49 PM, Vick Khera wrote:
> On Mon, Aug 10, 2009 at 9:46 AM, Bill Moran wrote:
>> We have servers using about 200 connections on average ... it climbs up
>> to 300+ during busy use. I've seen it peak as high as 450, and we've seen
>> no performance issues.
>>
>> This is a
May be a simple way would be to use a "SEQUENCE" database object. And
call nextval('your_sequence') to obtain the next unique value (of type
bigint).
According to PG docs
"http://www.postgresql.org/docs/8.4/interactive/functions-sequence.html";,
the sequence object has functions that "provide simpl
Hi George,
This is my guess to the cause of the problem (I could be wrong).
You edited the pg_dump generated sql file to suit to suit the
requirements of your target server (MySQL), during this edition, your
editor may have inserted line terminators where it found long sentences,
this long sen
On Mon, May 4, 2009 at 10:42 AM, A. Kretschmer
wrote:
> In response to Allan Kamau :
>> Hi
>>
>> I would like to calculate a product of a field's values of a relation,
>> this function may multiply each value and give the result as a single
>> float numb
,some_field)VALUES(4,null);
SELECT array_to_string(ARRAY(SELECT a.some_field FROM imaginary a),'*');
--within plpgsql execute the following
EXECUTE 'SELECT '||SELECT array_to_string(ARRAY(SELECT a.some_field FROM
imaginary a),'*') INTO _my_aggregated_product;
Hi
I would like to calculate a product of a field's values of a relation,
this function may multiply each value and give the result as a single
float number.
For example:
CREATE table imaginary(id INTEGER NOT NULL, some_field FLOAT
NULL,primary key(id));
INSERT INTO imarginary(1,0.333);I
You may want to zero in on the problem by performing database dumps
(using pg_dump and the various options accordingly) then restore on the
failing installation using the psql command.
Maybe (I am guessing here, you haven't elaborated on "crashes") you may
be issuing insert statements (in the
On Tue, Apr 28, 2009 at 2:21 PM, Jasen Betts wrote:
> On 2009-04-23, durumdara wrote:
>> Hi!
>>
>> In a mod_py application I wanna write a wrapper that handle all PSQL
>> data view with paging/slicing.
>>
>> For example:
>> I have 1.500 records. I wanna show only N (f. ex: 15) records in the
>
May be Javascript + JDBC not sure.
But the question is why would you want to do so?
Javascript can be read easily by the user having the javascript
running on their browser. JDBC or any other database connecting client
will want to some how authenticate the user in most cases the
username, passwor
Postgres by default uses the MVCC (Multiversion Concurrency Control,
MVCC) for concurrency control. This is a large topic and may require
more explanation than a simple email response would easily provide.
The well written PostgreSQL documentation has good explanation on this
topic (http://www.post
this password has been registered and won't go away even if the software is
> deleted.
>
> Any help much appreciated!
>
> PS I use windows vista and my friend turned my user account control off.
>
> Why on earth is there not a retrieve password function - unbelievable.
>
Hi Ivanmara,
There are two things about cursors you may need to remember ( I hope I
do remember fairly well not to error in this response :-) ).
1) A cursor is similar to a pointer to a given record, which means it's
"vision" is limited to the current record, and you move the cursor
forward by
It is assumed you are running Unix (or Linux). The commands you've
been provided with are standard Unix system commands that will help
you find the files (pg_hba.conf) you are looking for, the output of
these commands (locate or find) is the absolute path to your queried
file (in your case pg_hba.c
h I scp to the remote server then I issue
another call to psql to connect to the remote server's PostgreSQL and
execute an sql having a COPY abc FROM ..
Allan.
Sam Mason wrote:
On Tue, Oct 28, 2008 at 03:11:05PM +0200, Allan Kamau wrote:
Sam, I have been unable to understand your sh
Reid Thompson wrote:
Allan Kamau wrote:
Sam, I have been unable to understand your shell script well enough
to use it. Seems am slow this afternoon :-)
On this list I saw a message detailing using copy as illustrated
below (see )when I run this command I get the following output
(see
SV HEADER;'
COPY
(
SELECT * FROM abc
)
to STDOUT
WITH delimiter E'\t'
\echo '\\.'
Sam Mason wrote:
On Tue, Oct 28, 2008 at 01:25:00PM +0200, Allan Kamau wrote:
The alternative I am attempting is to use "COPY abc FROM STDIN WITH
HEADER". I pipe the
Hi all,
I am trying to copy data (results of a SELECT * FROM abc WHERE ...) to a
remote PC (on my network).
If I execute the "COPY abc2 FROM abc.txt CSV WITH HEADER" on psql
connected to the remote PC, PostgreSQL will expect the file to be
resident on the (remote) server's file system (or atl
Indeed, perhaps no one in the mailing list can look over your shoulder
to get the much needed additional details as Chandra has pointed out.
My guess is that you may be trying a binary install, perhaps rpm. The
install the complains that it cannot find libraries that it requires
installed on t
Sam Mason wrote:
On Tue, Jun 24, 2008 at 11:13:14PM -0500, Marcelo Martins wrote:
is there a way to find out / calculate / estimate how big a pg_dump
using plain text format for a DB will be ?
How about simply doing:
pg_dump | wc -c
Sam
Hi Marcelo,
If (using Sam's suggest
Initially you may want to get the full dump (this applies also to the
replication option) across to your other site. You may want to bzip2 the
dump file, you may be surprised by the reduction of file size using
bzip2. Try "tar -cjf mydump.sql.tar.bz2 mydump.sql" then transfer it
using scp or pl
Hi Bohdan,
Is your web applications for use with PostgreSQL server administration
where you would like users to supply their login credentials for
PostgreSQL so that their actions within the db can be limited by the
fine gain privileges assigned to them?
If it is not then you may want to mayb
Thanks, I have "reworded" the email (replaced "transaction" with
"purchase"). The email has now been sent to the pgsql-sql mailing list.
Craig Ringer wrote:
Allan Kamau wrote:
Hi all,
I have a plain sql problem (didn't know where else to post it).
Hi all,
I have a plain sql problem (didn't know where else to post it).
I have a list of transactions (market basket) and I would like to select
non redundant longest possible patterns by eliminating
(creating/populating other table to contain only non redandant itemsets)
transactions having it
> I would like to write begin and commit/rollback
> transaction instructions within plpgsql writen
> functions.
> Also how to write 'lock serializable' in plpgsql.
>
> Thank you in advance.
>
> Allan Kamau.
> I would like to write begin and commit/rollback
> transaction instructions in plpgsql functions I am
writing.
> Also how to write 'lock serializable' in plpgsql
>
> Thank you in advance.
>
> Allan Kamau.
>
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