PostgreSQL - Index-Only Scans: We've Got 'Em(rhaas.blogspot.com)
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PostgreSQL - Index-Only Scans: We've Got 'Em
http://rhaas.blogspot.com/2011/10/index-only-scans-weve-got-em.html
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http://rhaas.blogspot.com/2011/10/index-only-scans-weve-got-em.html
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