> - The statistics gathered by ANALYZE are independent of the tablespace > containing the table. yes. > - The tablespace containing the table has no influence on query planning > unless seq_page_cost or random_page_cost has been set on the > tablespace. yes. > - VACUUM ANALYZE does the same as VACUUM followed by ANALYZE. no. it is fine grained, but in the diffs there is: VACUUM and ANALYSE do not update pg_class the same way for the reltuples/relpages: for ex VACUUM is accurate for index, and ANALYZE is fuzzy so if you issue a vacuum you have exact values, if you then run ANALYZE you may change them to be less precise. -- Cédric Villemain +33 (0)6 20 30 22 52 http://2ndQuadrant.fr/ PostgreSQL: Support 24x7 - Développement, Expertise et Formation
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