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Activity for Jack Douglas
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #277226 |
An index on `textfield, do_not_touch` will be less efficient than one on just `textfield` because the values in `do_not_touch` are heavily skewed — adding it to the index just means more IO when scaning. (more) |
— | over 4 years ago |
| Comment | Post #277216 |
"…leading to a loop or a race": what happens when you add `stopProcessing="true"`? (more) |
— | over 4 years ago |
| Edit | Post #277187 | Initial revision | — | over 4 years ago |
| Answer | — |
A: Why would excluding records by creating a temporary table of their primary keys be faster than simply excluding by value? > Why would the second way be faster? Generally speaking, the first form will perform worse (as well as looking a lot worse) than the second. You are hitting an edge case where the opposite is true, because: 1. The `not in` in your first example is likely to be transformed into an anti-join (so... (more) |
— | over 4 years ago |
| Comment | Post #277148 |
"Every so often I need to join…" — none of your examples have any joins. (more) |
— | over 4 years ago |