Обсуждение: pgsql: Add calcluation of bitmap storage capacity.
Log Message: ----------- Add calcluation of bitmap storage capacity. < be cleared when a heap tuple is expired. Another idea is to maintain < a bitmap of heap pages where all rows are visible to all backends, < and allow index lookups to reference that bitmap to avoid heap < lookups, perhaps the same bitmap we might add someday to determine < which heap pages need vacuuming. > be cleared when a heap tuple is expired. > > Another idea is to maintain a bitmap of heap pages where all rows > are visible to all backends, and allow index lookups to reference > that bitmap to avoid heap lookups, perhaps the same bitmap we might > add someday to determine which heap pages need vacuuming. Frequently > accessed bitmaps would have to be stored in shared memory. One 8k > page of bitmaps could track 512MB of heap pages. Modified Files: -------------- pgsql/doc: TODO (r1.1709 -> r1.1710) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1709&r2=1.1710) pgsql/doc/src/FAQ: TODO.html (r1.216 -> r1.217) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.216&r2=1.217)