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Update bitmap index description: 

<   Such indexes could be more compact if there are only a few unique values.
>   Such indexes could be more compact if there are only a few distinct values.
>   Such indexes can also be compressed.  Keeping such indexes updated can be
>   costly.
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Bruce Momjian 2004-11-09 15:11:11 +00:00
parent 1813d94664
commit 960f545041
1 changed files with 4 additions and 2 deletions
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@ -6,7 +6,7 @@ TODO list for PostgreSQL
Bracketed items "[]" have more detail. Bracketed items "[]" have more detail.
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Mon Nov 8 23:13:58 EST 2004 Last updated: Tue Nov 9 10:10:57 EST 2004
The most recent version of this document can be viewed at the PostgreSQL web The most recent version of this document can be viewed at the PostgreSQL web
site, http://www.PostgreSQL.org. site, http://www.PostgreSQL.org.
@ -261,7 +261,9 @@ Indexes
* Allow the creation of on-disk bitmap indexes which can be quickly * Allow the creation of on-disk bitmap indexes which can be quickly
combined with other bitmap indexes combined with other bitmap indexes
Such indexes could be more compact if there are only a few unique values. Such indexes could be more compact if there are only a few distinct values.
Such indexes can also be compressed. Keeping such indexes updated can be
costly.
* Allow use of indexes to search for NULLs * Allow use of indexes to search for NULLs