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Merge visibility map crash-safety into index-only scan release note

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item, per Robert Haas.
This commit is contained in:
Bruce Momjian 2012-05-10 16:50:34 -04:00
parent f40022f1ad
commit 5428ff4af8
1 changed files with 3 additions and 13 deletions
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16
doc/src/sgml/release-9.2.sgml
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@ -413,10 +413,11 @@
<para>
This is often called "index-only scans" or "covering indexes".
This is possible for heap pages with exclusively all-visible
tuples, as reported by the visibility map.
tuples, as reported by the visibility map. The visibility map was
made crash-safe as a necessary part of implementing this feature.
</para>
</listitem>
<listitem>
<para>
Allow frequently uncontended locks to be recorded using a new
@ -539,17 +540,6 @@
</para>
</listitem>
<listitem>
<para>
Make the visibility map crash-safe (Robert Haas, Noah Misch)
</para>
<para>
This helps vacuum be more efficient, and is necessary for
index-only scans.
</para>
</listitem>
<listitem>
<para>
Improve PowerPC and Itanium spinlock performance (Manabu Ori,