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Diffstat (limited to 'doc/TODO')
| -rw-r--r-- | doc/TODO | 12 |
1 files changed, 7 insertions, 5 deletions
@@ -2,7 +2,7 @@ PostgreSQL TODO List ==================== Current maintainer: Bruce Momjian (bruce@momjian.us) -Last updated: Sat Jun 24 19:44:48 EDT 2006 +Last updated: Sat Jun 24 19:47:53 EDT 2006 The most recent version of this document can be viewed at http://www.postgresql.org/docs/faqs.TODO.html. @@ -1131,11 +1131,13 @@ Vacuum http://archives.postgresql.org/pgsql-patches/2006-03/msg00142.php -* Allow heap reuse of UPDATEd rows if old and new versions are on the - same heap page? +* Allow heap reuse of UPDATEd rows if no indexed columns are changed, + and old and new versions are on the same heap page? - This is possible for same-page updates because a single index row - can point to both old and new values. + While vacuum handles DELETEs fine, updating of non-indexed columns, like + counters, are difficult for VACUUM to handle efficiently. This method + is possible for same-page updates because a single index row can be + used to point to both old and new values. http://archives.postgresql.org/pgsql-hackers/2006-06/msg01305.php * Auto-vacuum |