Praveen Kumar N wrote:
can anybody explain me what is the difference between system cache and buffer cache?

I found that keywords in PostgreSql FAQ

System cache is a per-row cache of system catalog tables. It's used to speed up lookup of things like function names. It's implemented in src/backend/utils/cache/syscache.c

Buffer cache is the cache managed by the buffer manager, that caches any blocks from any relation used in the system. All access to relations go through the buffer cache, using ReadBuffer/ReleaseBuffer (etc.) calls. It's implemented in src/backend/storage/buffer/bufmgr.c

 Heikki Linnakangas

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