Erik Darling shows that the meter’s only running on lock waits when there’s a blocking condition:
My workload is Highly Contrived™ so the avg wait and query duration line up. In real life, you probably won’t have queries that were only ever waiting on locks to be released.
But it’s worth making some comparisons like this when you’re having blocking problems, especially when you tie wait times and durations in with cpu time.
If cpu is very low but duration is high, generally, you’ve found blocked queries.
Read on for the demo, as well as an expired coupon.