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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
version |
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PostgreSQL 16.0 (Debian 16.0-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit |
SELECT 1
CREATE TABLE
INSERT 0 100000
CREATE INDEX
VACUUM
QUERY PLAN |
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Index Only Scan using appointments_id_idx on appointments (cost=0.14..1003.51 rows=99500 width=4) (actual time=0.020..0.030 rows=101 loops=1) |
Heap Fetches: 0 |
Planning Time: 0.300 ms |
Execution Time: 0.054 ms |
EXPLAIN
relname | relpages | reltuples |
---|---|---|
appointments_id_idx | 2 | 74 |
appointments_pkey | 276 | 100000 |
SELECT 2