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harshreality
on May 15, 2012
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PostgreSQL 9.2 beta adds JSON
It's not the default already because pre-9.2 the MVCC implementation in Postgres didn't guarantee that an index has the same visibility as the table data.
http://rhaas.blogspot.com/2010/11/index-only-scans.html
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http://rhaas.blogspot.com/2010/11/index-only-scans.html