Check out the "Inside the PostgreSQL Buffer Cache" link here: http://projects.2ndquadrant.com/talks
Thanks to Greg Smith (active here). Derrick On Fri, May 27, 2011 at 3:36 PM, preetika tyagi <preetikaty...@gmail.com>wrote: > Hi All, > > I am little confused about the internal working of PostgreSQL. There is a > parameter shared_buffer in postgres.conf and I am assuming that it is used > for buffer management in PostgreSQL. If there is a need to bring in a new > page in the buffer and size exceeds the shared_buffer limit, a victim dirty > page will be written back to the disk. > > However, I have read on many links that PostgreSQL depends on the OS for > caching. (http://www.varlena.com/GeneralBits/Tidbits/perf.html#shbuf) > > So my question is, the actual limit of the shared buffer will be defined by > OS or the shared_buffer parameter in the postgres.conf to figure whether a > victim dirty page needs to be selected for disk write or not? > > Thanks! >
