imitatio creatio » postgres

Import zbiorów TERYT do bazy danych SQL

filip — Wed, 09 Jun 2010 08:57:41 +0000

Główny Urząd Statystyczny administruje bazą danych podziału administracyjnego Polski, z dokładnością do ulic i nazw miejscowych. W tym artykule pokażę jak zaimportować te dane do bazy relacyjnej (na przykładzie PostgreSQL oraz Microsoft SQL Server)

pgbouncer mini HOWTO + benchmark

filip — Fri, 23 Apr 2010 19:56:03 +0000

I've decided to write this mini howto in order to prove that pgbouncer is easy to install and configure, and is really useful, even in minimal setups.

dynamic SQL parameters in PL/PgSQL functions

filip — Mon, 08 Mar 2010 13:22:34 +0000

It pays to read documentation. From PostgreSQL 8.3 to 8.4 there was one interesting addon for plpgsql: ability to pass parameter values directly into EXECUTE. Of course depesz wrote about it. And I did read it; But still (by routine) I was using something like: sql_query := 'SELECT foo FROM bar JOIN baz USING (barbaz) WHERE baz.id = [...]

postgres schemagrep function

filip — Fri, 05 Mar 2010 11:24:03 +0000

From time to time, I need to "grep" database schema to locate some database objects. One possibility is to dump the whole schema to file (pg_dump -s DBNAME) and use your text editor to browse it. It is quite handy and I actually use it a lot. But sometimes, it is more convenient to have this "grep-like" [...]

iterate over a table in PostgreSQL vs SAS

filip — Mon, 08 Feb 2010 16:44:40 +0000

I have struggled how to achieve something like this in SAS. (you can read it as pseudocode but it's real PL/PgSQL): DO $this$ DECLARE my_table name; BEGIN; -- iterate over table names FOR my_table IN SELECT nazwa FROM tabele LOOP sql := 'CREATE [...]

postgresql and some grsec kernels = FAIL

filip — Tue, 15 Dec 2009 10:21:55 +0000

Short message: Do not run postgres on some grsec - patched kernels. Disclaimer: I write this just because I didn't find any clear explanations of the problem on the net, and I feel that such note can be useful for other who have this problem. I'm not an expert on grsec. The story A friend of mine had [...]

PL/Perl regex vs builtin regex_replace in postgres

filip — Tue, 14 Jul 2009 23:19:03 +0000

Maybe you (like me) wondered which one is faster... to use builtin regexp_replace function or to use Perl's regex engine via PL/Perl. Here you are - this is a test I made (PostgreSQL 8.3.7, Perl 5.8.8, on CentOS 5,3) First we have a plperl function: CREATE OR REPLACE FUNCTION test_perl( TEXT ) RETURNS TEXT AS $code$ my $str = shift; $str [...]

running databases inside Vmware

filip — Sat, 07 Mar 2009 04:48:58 +0000

This is just a warning note for people running databases inside Vmware.

psql variables – quoting and more

filip — Fri, 19 Dec 2008 20:40:27 +0000

psql, postgreSQL powerful command line interface, has it's variables system. I do use it sometimes but... how many single quotes should I put there? I have puzzled over this so many times, that I decided to put it here as a memo. Proper quoting of text variables Variable declaration: \set d1 '''2008-01-01 00:00:00.000''' \set d2 '''2008-12-31 23:59:59.999''' Variable usage: SELECT something FROM [...]

Replikacja w PostgreSQL za pomocą Slony-I – update

filip — Fri, 19 Dec 2008 17:30:39 +0000

W poprzednim artykule opisałem jak zestawić replikację w postgresie za pomocą slon-tools.

Dziś chciałem dodać parę rzeczy których tam zabrakło, a które są często potrzebne w praktycznym zastosowaniu Slony-I.