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Archive for the 'postgresql' Category

pg_top

June 09th, 2010 | Category: linux,postgresql

pg_top is a top linux command like for postgresql server. It’s a way to monitor and analyse query execution.
To install on fedora like server :

  1. $sudo yum install pg_top

Most used options are :
-h to define hostname
-d to select a database
-U to choose a user
-W to get prompt for password

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Sauvegarde et restauration de Postgresql

January 26th, 2010 | Category: database,OpenSource,postgresql

Postgresql est un SGBD opensource offrant plusieurs avantages dont la robustesse et le respect des normes SQL (ANSI SQL 89, SQL 92 (SQL 2), SQL 99 (SQL 3) et SQL:2003 ).
Je l’utilise quotidiennement pour le traitement de plusieurs giga de données.
Je vais vous présenter un moyen efficace pour faire la sauvegarde de vos bases de données.

  • Pour commencer, il faut connaître les bases que vous avez, pour cela sous l’utilisateur postgres, il faut lancer la commande suivante :
    1. $su – postgres
    2. $psql -l


  • Par la suite, lancer la commande pg_dump avec la base que vous voulez (dans notre exemple la base client )
    1. $pg_dump client > client.dump.out


  • Pour la restauration, la commande psql à travers cette requête
    1. $ psql -d client -f client.dump.out


  • Une base de donnée est volumineuse donc l’utilisation d’une méthode de compression est la bienvenu. Le backup sera fait alors avec l’ajout de gzip pour avoir la requête suivante
    1. $ pg_dump client | gzip -c > client.dump.out.gz


  • et pour la restauration
    1. $ pg_dump client | gzip -c >$ gunzip client.dump.out.gz
    2. $ psql -d client -f client.dump.out


  • Enfin, pour le backup de toutes les bases, il faut utiliser la commande pg_dumpall
    1. $ pg_dumpall > all.dbs.out


  • Pour la restauration
    1. $ psql -f all.dbs.out postgres


Voila, je pense que maintenant, vous avez les outils nécessaire pour sauvegarder vos informations.
PS: Pour ma part, j’utilise postgresql sur deux serveurs qui tourne sous fedora et centos. Je vous invite à faire un tour au niveau fedora fr docs ou il y a une page consacré à l’installation et configuration de postgresql sous fedora.

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