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Postgres 9.4 feature highlight: lossy/exact pages for bitmap heap scan This is an off-site link.  Please review our Terms of Service for additional information.


(Michael Paquier) When scanning a relation with a query with a bitmap heap scan and that the bitmap is not large enough to contain a reference to each tuple individually, bitmap heap scan switches to lossy mode where instead of the tuples relation pages are referenced in the bitmap.

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