Why Cardinality Estimates Go Wrong: An Oracle Optimizer Lab with Skewed Data
Every Oracle DBA has had this conversation with a developer: "the query ran fine yesterday, it's slow today, nothing changed." Nine times out of ten, when you pull the plan, the root cause is the same
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Ира Иващенко
I’m interested in AI, testing different programs and tools, and learning something new.
Interesting breakdown. It’s a good reminder that an optimizer estimate can’t always be fixed with a histogram — sometimes the real problem is somewhere else.