Am 18.04.19 um 08:52 schrieb rihad:
Hi. Say there are 2 indexes:
"foo_index" btree (foo_id)
"multi_index" btree (foo_id, approved, expires_at)
foo_id is an integer. Some queries involve all three columns in their
WHERE clauses, some involve only foo_id.
Would it be ok from general performance standpoint to remove foo_index
and rely only on multi_index? I know that
PG would have to do less work updating just one index compared to
updating them both, but wouldn't searches
on foo_id alone become slower?
it depends .
it depends on the queries you are using, on your workload. a
multi-column-index will be large than an index over just one column,
therefore you will have more disk-io when you read from such an index.
Regards, Andreas
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