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Clarify description of covering indexes in release notes

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Simon Riggs 2012-06-01 11:35:27 +01:00
parent a6e1d7b5fb
commit 56b62cbd01
1 changed files with 2 additions and 1 deletions
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doc/src/sgml/release-9.2.sgml
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@ -425,7 +425,8 @@
</para>
<para>
This is often called "index-only scans" or "covering indexes".
This is often called "index-only scans", a feature which now enables
the use of indexes with additional columns, or "covering indexes".
This is possible for heap pages with exclusively all-visible
tuples, as reported by the visibility map. The visibility map was
made crash-safe as a necessary part of implementing this feature.