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Diffstat (limited to 'doc/TODO')
| -rw-r--r-- | doc/TODO | 11 |
1 files changed, 7 insertions, 4 deletions
@@ -2,7 +2,7 @@ PostgreSQL TODO List ==================== Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) -Last updated: Thu Dec 1 17:12:27 EST 2005 +Last updated: Thu Dec 1 17:30:23 EST 2005 The most recent version of this document can be viewed at http://www.postgresql.org/docs/faqs.TODO.html. @@ -859,11 +859,14 @@ Cache Usage Currently indexes do not have enough tuple visibility information to allow data to be pulled from the index without also accessing - the heap. One way to allow this is to set a bit to index tuples + the heap. One way to allow this is to set a bit on index tuples to indicate if a tuple is currently visible to all transactions when the first valid heap lookup happens. This bit would have to - be cleared when a heap tuple is expired. - + 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. * Consider automatic caching of queries at various levels: |