CVS log for pgsql/src/backend/access/heap/README.HOT

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Revision 1.4: download - view: text, markup, annotated - select for diffs
Thu Oct 2 20:59:31 2008 GMT (9 months ago) by momjian
Branches: MAIN
CVS tags: REL8_4_STABLE, REL8_4_RC2, REL8_4_RC1, REL8_4_BETA2, REL8_4_BETA1, REL8_4_0, HEAD
Diff to: previous 1.3: preferred, colored
Changes since revision 1.3: +20 -21 lines
Update README.HOT to reflect new snapshot tracking and xmin advancement
code in 8.4.
Revision 1.3: download - view: text, markup, annotated - select for diffs
Fri Mar 21 13:23:27 2008 GMT (15 months, 1 week ago) by momjian
Branches: MAIN
Diff to: previous 1.2: preferred, colored
Changes since revision 1.2: +3 -5 lines
More README src cleanups.
Revision 1.2: download - view: text, markup, annotated - select for diffs
Fri Sep 21 21:25:42 2007 GMT (21 months, 1 week ago) by tgl
Branches: MAIN
CVS tags: REL8_3_STABLE, REL8_3_RC2, REL8_3_RC1, REL8_3_BETA4, REL8_3_BETA3, REL8_3_BETA2, REL8_3_BETA1, REL8_3_7, REL8_3_6, REL8_3_5, REL8_3_4, REL8_3_3, REL8_3_2, REL8_3_1, REL8_3_0
Diff to: previous 1.1: preferred, colored
Changes since revision 1.1: +3 -3 lines
Improve handling of prune/no-prune decisions by storing a page's oldest
unpruned XMAX in its header.  At the cost of 4 bytes per page, this keeps us
from performing heap_page_prune when there's no chance of pruning anything.
Seems to be necessary per Heikki's preliminary performance testing.
Revision 1.1: download - view: text, markup, annotated - select for diffs
Thu Sep 20 17:56:30 2007 GMT (21 months, 1 week ago) by tgl
Branches: MAIN
HOT updates.  When we update a tuple without changing any of its indexed
columns, and the new version can be stored on the same heap page, we no longer
generate extra index entries for the new version.  Instead, index searches
follow the HOT-chain links to ensure they find the correct tuple version.

In addition, this patch introduces the ability to "prune" dead tuples on a
per-page basis, without having to do a complete VACUUM pass to recover space.
VACUUM is still needed to clean up dead index entries, however.

Pavan Deolasee, with help from a bunch of other people.
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