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Results tagged with postgresql
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user 278810
All versions of PostgreSQL. Add an additional version-specific tag like [postgresql-13] if that context is relevant.
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Why did the number of live rows fetched by index scans drop after table ANALYZE?
We use PostgreSQL 12 and have a simple table, event_participant, storing 100 GBs of data.
event_participant has all the necessary indexes, so all rows are fetched using them, i.e., no rows are fetched …
- 29
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Why did the number of live rows fetched by index scans drop after table ANALYZE?
; PostgreSQL used event_participant_event_id_idx to fetch all rows with event_id=tour2023 and then filter desired row by user_id instead of using the composite index "event_participant_pkey" PRIMARY KEY … I'm still missing part of why PostgreSQL used the (event_id) index only, as I expected the query planner to favor the composite index when both user_id and event_id are specified in the query. …
- 29