May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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If you have multi-column indexes (or joins), the optimizer will assume that the column values are independent of each other, which can lead to misestimation in cases where there is a correlation between the values.
If you have two dependent columns, such as state and area_code, then you can define additional statistics that will be collected when you next ANALYZE the table:
CREATE STATISTICS cust_s1 (ndistinct, dependencies) ON state, area_code FROM cust;
The execution time of ANALYZE will increase to collect the additional stats information, plus there is a small increase in query planning time, so use this sparingly when you can confirm this will make a difference. You don't need to have both distinct and dependencies in all ...
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