Starting to play around PostgreSql – what to begin

My client asks to work on a Java batch to migrate data from PostgreSql to Oracle via JDBC, with almost 2 days to spend around preparing the server, loading dump, starting dev. around as well.

Here wanna to share what I went on (not sure if I went to the right way, give advise if any)

[toc]

1. Download PostgreSql & Install

• Go to PostgreSql download site: http://www.postgresql.org/download/
• In my case, I use PostgreSql 8.3.8

2. Download Administration tool for PostgreSql: pgAdmin

• pgAdmin 3.1.8.4

3. Configure the postgreSql server be able to accept remote access from other client PC

Suppose using the default port of PostgreSql (Port: 5432)

I corrected for following configuration file:

• postgresql.conf
  • Change listen_addresses from 'localhost' to '*'

  listen_addresses = '*'

• pg_hba.conf
  • We need to enable client pc ip to access Postgresql with following rule:
  • # TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD
  • host    all         all         127.0.0.1/32          md5  ==> For local pc only
  • host    all         all         192.168.1.0/24     md5   ==> All PC in my LAN

4. Connecting to the server for the first time

Generally the query is the same to MySql or Plsql of oracle as well for basically… I haven’t gone detail yet.

5. Loading existing dump to server

Go to DOS at PostgreSql/bin folder and follow for following step:

• — delete old db
  dropdb -U {admin_user} {db_name}
  • if the db is not exist will saw an error as well.

• — create db
  createdb -U {admin_user} -T template0 {db_name}
  • I created the db with PostgreSql template “zero” (template0)
  • Why create with template0?
  • Because the dumps produced by pg_dump are relative to template0 that will also dump all from template1. (see explain detail in Manual on Restoring the Dump)

• — execute to restore dump file to db
  psql -U {admin_user} -d {db_name} -f “{dump.sql file}”

Notice: sometimes not work when the database is accessing my client PC or currently being connected; Stop the service and restart the service before perform above action.

My first task is done now…

We are going on with Jdbc connection of PostgreSql, I’m reading following post:

• http://wiht.link/postgresql_resources
• http://mojo.codehaus.org/sql-maven-plugin/examples/execute.html

To continue with around Jdbc dev. later.