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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
by harshreality 14y ago
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 http://rhaas.blogspot.com/2010/11/index-only-scans.html