Download of the day: PostgreSQL 8.3 Database Server

Posted on in Categories Linux, Postgresql, UNIX, Windows last updated February 5, 2008

PostgreSQL 8.3 has been released and available for download. PostgreSQL considered as the world’s most advanced open source database. From the announcement page:

This release includes a record number of new and improved features which will greatly enhance PostgreSQL for application designers, database administrators, and users, with more than 280 patches by dozens of PostgreSQL contributors from 18 countries. Version 8.3 provides greater consistency of performance than previous versions, ensuring that every user can depend on the same high performance demonstrated in recent benchmarks for every transaction, whether in peak hours or not, seven days a week, 52 weeks per year. Major performance enhancements include:

-> Heap Only Tuples (HOT), which eliminate up to 3/4 of the maintenance overhead of frequently updated tables
-> Spread checkpoints and background writer autotuning, which reduce the impact of checkpoints on response times
-> Asynchronous commit option for much faster response times on some transactions

These changes also significantly accelerate transaction processing throughput, between 5% and 30%, depending on the workload.

Download PostgreSQL 8.3 Database Server

=> Visit official project web site to grab PostgreSQL 8.3 Database Server

You may find following document interesting while using PostgreSQL:

How Do I Enable remote access to PostgreSQL database server?

Posted on in Categories CentOS, Debian Linux, Gentoo Linux, Howto, Linux, Networking, Postgresql, Ubuntu Linux, UNIX last updated February 6, 2008

By default, PostgreSQL database server remote access disabled for security reasons. However, some time you need to provide the remote access to database server from home computer or from web server.

Step # 1: Login over ssh if server is outside your IDC

Login over ssh to remote PostgreSQL database server:
$ ssh [email protected]

Step # 2: Enable client authentication

Once connected, you need edit the PostgreSQL configuration file, edit the PostgreSQL configuration file /var/lib/pgsql/data/pg_hba.conf (or /etc/postgresql/8.2/main/pg_hba.conf for latest 8.2 version) using a text editor such as vi.

Login as postgres user using su / sudo command, enter:
$ su - postgres
Edit the file:
$ vi /var/lib/pgsql/data/pg_hba.conf
OR
$ vi /etc/postgresql/8.2/main/pg_hba.conf
Append the following configuration lines to give access to 10.10.29.0/24 network:
host all all 10.10.29.0/24 trust
Save and close the file. Make sure you replace 10.10.29.0/24 with actual network IP address range of the clients system in your own network.

Step # 2: Enable networking for PostgreSQL

You need to enable TCP / IP networking. Use either step #3 or #3a as per your PostgreSQL database server version.

Step # 3: Allow TCP/IP socket

If you are using PostgreSQL version 8.x or newer use the following instructions or skip to Step # 3a for older version (7.x or older).

You need to open PostgreSQL configuration file /var/lib/pgsql/data/postgresql.conf or /etc/postgresql/8.2/main/postgresql.conf.
# vi /etc/postgresql/8.2/main/postgresql.conf
OR
# vi /var/lib/pgsql/data/postgresql.conf
Find configuration line that read as follows:
listen_addresses='localhost'
Next set IP address(es) to listen on; you can use comma-separated list of addresses; defaults to ‘localhost’, and ‘*’ is all ip address:
listen_addresses='*'
Or just bind to 202.54.1.2 and 202.54.1.3 IP address
listen_addresses='202.54.1.2 202.54.1.3'
Save and close the file. Skip to step # 4.

Step #3a – Information for old version 7.x or older

Following configuration only required for PostgreSQL version 7.x or older. Open config file, enter:
# vi /var/lib/pgsql/data/postgresql.conf
Bind and open TCP/IP port by setting tcpip_socket to true. Set / modify tcpip_socket to true:
tcpip_socket = true
Save and close the file.

Step # 4: Restart PostgreSQL Server

Type the following command:
# /etc/init.d/postgresql restart

Step # 5: Iptables firewall rules

Make sure iptables is not blocking communication, open port 5432 (append rules to your iptables scripts or file /etc/sysconfig/iptables):

iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d 10.10.29.50  --dport 5432 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp -s 10.10.29.50 --sport 5432 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT

Restart firewall:
# /etc/init.d/iptables restart

Step # 6: Test your setup

Use psql command from client system. Connect to remote server using IP address 10.10.29.50 and login using vivek username and sales database, enter:
$ psql -h 10.10.29.50 -U vivek -d sales

Further readings:

=> man page: pgsql and configuration file

Quickly Backup / dump MySql / Postgres database to another remote server securely

Posted on in Categories Backup, FreeBSD, Howto, Linux, MySQL, Postgresql, RedHat/Fedora Linux, Sys admin, Tips, UNIX last updated October 1, 2007

Using UNIX pipe concept one can dump database to another server securely using ssh protocol. All you need remote execution rights for the ‘dd’ command, over SSH. This allows you to run database dumps across an encrypted channel.

Dump Postgres Database using ssh

Use pg_dump command command:
pg_dump -U USERNAME YOUR-DATABASE-NAME | ssh [email protected] "dd of=/pgsql/$(date +'%d-%m-%y')"

Dump MySQL Database using ssh

Type the following command:
mysqldump -u USERnAME -p'PASSWORD' YOUR-DATABASE-NAME | ssh [email protected] "dd of=/mysql/$(date +'%d-%m-%y')"