Re: I/O on select count(*) - Mailing list pgsql-performance

Matthew Wakeling wrote:

Aside from the rest of commentary, a slight clarification:

> So, as I understand it, Postgres works like this:
>
> 1. You begin a transaction. Postgres writes an entry into pg_clog.

Starting a transaction does not write anything to pg_clog.

--
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.