Balkrishna Sharma <b...@hotmail.com> wrote: > I am increasing the shared_buffer size in postgresql.conf and want > to measure its effect on READ. In essence I want to know if the > SELECT queries I am firing repeatedly is reading from the buffer > or going directly to the disk. There's a third option -- PostgreSQL reads and writes will normally go through the OS cache. > Right now I am just looking at execution time of the SELECTs and > trying to conclude. But there should be a direct way to see where > the SELECT reads from. > How can I accomplish this ? You didn't mention your OS. There's usually a way to monitor disk I/O built in to the OS. I usually start with: vmstat 1 -Kevin
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