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> * -Cache last known per-tuple offsets to speed long tuple access
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Bruce Momjian 2005-03-14 16:37:02 +00:00
parent 9abced035d
commit 2ed560c99f
1 changed files with 2 additions and 9 deletions
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@ -2,7 +2,7 @@
TODO list for PostgreSQL
========================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Sun Mar 13 22:00:15 EST 2005
Last updated: Mon Mar 14 11:36:52 EST 2005
The most recent version of this document can be viewed at the PostgreSQL web
site, http://www.PostgreSQL.org.
@ -680,14 +680,7 @@ Cache
* Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
especially for WAL writes
* Cache last known per-tuple offsets to speed long tuple access
While column offsets are already cached, the cache can not be used if
the tuple has NULLs or TOAST columns because these values change the
typical column offsets. Caching of such offsets could be accomplished
by remembering the previous offsets and use them again if the row has
the same pattern.
* -Cache last known per-tuple offsets to speed long tuple access
* Speed up COUNT(*)
We could use a fixed row count and a +/- count to follow MVCC