Hi. > fashion --- for instance, each page is read only once. Index scan will > result in a random sequence of accesses to the heap. (Of course, it > might have some order if the index is well correlated with the heap > order, but most of the time that's not true.)
Thank you. I finally understand the difference. Cheers. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
