i am using postgresql 8.0.3 as a single user by running "postgres"
I want to purge all contents in the bufferpool, and I did this by
calling "InitBufTable(256)" (buf_table.c) after each query. However,
this seems not working for each followup query I still get less disk read
(tracked by "smgrread()" in smgr.c) and increased bufferhitcount.
Could anyone tell me which module shall i modify instead?