thanks Christophe. will try to go through it. its bit difficult to grasp. On Mon, Mar 6, 2023 at 5:08 PM Christophe Pettus <x...@thebuild.com> wrote:
> > > > On Mar 6, 2023, at 16:24, Siddharth Jain <siddh...@gmail.com> wrote: > > My question: How can it then store a B Tree on disk? I would think > storing a B Tree requires storing disk offset addresses and so on (for a > node to navigate to another etc.). For this, one would need to write > directly to the disk using low-level disk access functions and not use file > system API. > > All of PostgreSQL's relations (tables and indexes) are stored in files. > (They're actually stored in a set of files if it's larger than 1GB, but > each relation is treated as one logical file.) The "pointers" in this case > are just offsets from the start of that file. > > There's some additional information here: > > https://www.postgresql.org/docs/current/storage.html > > and here: > > https://www.postgresql.org/docs/current/btree-implementation.html
