Can you please suggest me some links where I can learn: - Mailing list pgsql-performance

Hello Friends,

I want start contributing in Postgres in code level. I read some ppts and some tutorials in postgres manual.

Can you please suggest me some links where I can learn:

1.       Transaction Isolation in Database

2.       Query procession and possible optimizations.

3.       How to improve query and its performance.

4.       MVCC in detail.

Regards

Tarkeshwar