On Fri, Jun 18, 2010 at 2:36 PM, mac_man2...@hotmail.it <mac_man2...@hotmail.it> wrote: > Please take a look at the initial comment contained into the logtape.c file: > http://doxygen.postgresql.org/logtape_8c-source.html > > Almost at the beginning of that file, it is affirmed that implementing tapes > on disk (quote: by creating a separate file for each "tape") will require > more space than implementing merge on tapes themselves. > Now, taking in account that tuplesort.c and logtape.c actually DO implement > tapes on disk, in which case it would require between 2x and 4x the input > space?
Did you read the rest of the comment? It explains how the code avoids this... -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise Postgres Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
