High Disk write and space taken by PostgreSQL

[J Ramesh Kumar <rameshj1977@xxxxxxxxx>]

Hi,

My application has high data intensive operations (high number of inserts 1500 per sec.). I switched my application from MySQL to PostgreSQL. When I take performance comparison report between mysql and pgsql, I found that, there are huge difference in disk writes and disk space taken. Below stats shows the difference between MySQL and PostgreSQL.

	MySQL	PostgreSQL
Inserts Per Second*	1500	1500
Updates Per Second*	6.5	6.5
Disk Write Per Second*	0.9 MB	6.2 MB
Database Size Increased Per day*	13 GB	36 GB

* approx values

Why this huge difference in disk writes and disk space utilization? How can I reduce the disk write and space ? Kindly help me. Please let me know, if you require any other information(such as postgres.conf).

Thanks,

Ramesh