Needs Suggestion

[SUBHAM ROY <subham.iem@xxxxxxxxx>]

My output of explain (analyze,buffers) is something like this:

shared hit=3796624 read=46038

So what is meant by read here? Does it indicates number of disk reads?

Does shared hit takes into account only the hit in the pg_buffercache of the postgres or it also takes into account the linux buffers that postgres uses?

-- 
Thank You,
Subham Roy,
CSE IIT Bombay.