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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 |
|---|
| 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 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
| rid | d01 | dtn |
|---|---|---|
| 1 | 0.355 | 2024-07-08 15:18:53.689 |
| 2 | 0.019 | 2024-07-08 15:18:53.693 |
| 3 | 0.726 | 2024-07-08 15:18:53.697 |
| 4 | 0.488 | 2024-07-08 15:18:53.701 |
| 5 | 0.213 | 2024-07-08 15:18:53.705 |
SELECT 5
CREATE SEQUENCE
UPDATE 1
| rid | d01 | dtn |
|---|---|---|
| 2 | 0.019 | 2024-07-08 15:18:53.693 |
| 3 | 0.726 | 2024-07-08 15:18:53.697 |
| 4 | 0.488 | 2024-07-08 15:18:53.701 |
| 5 | 0.213 | 2024-07-08 15:18:53.705 |
| 1 | 0.001 | 2024-07-10 09:33:05.995822 |
SELECT 5
UPDATE 1
| rid | d01 | dtn |
|---|---|---|
| 3 | 0.726 | 2024-07-08 15:18:53.697 |
| 4 | 0.488 | 2024-07-08 15:18:53.701 |
| 5 | 0.213 | 2024-07-08 15:18:53.705 |
| 1 | 0.001 | 2024-07-10 09:33:05.995822 |
| 2 | 0.002 | 2024-07-10 09:33:06.003428 |
SELECT 5