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)