Cost-Based Oracle Fundamentals - Jonathan Lewis
Cost-Based Oracle Fundamentals - Jonathan Lewis The question, "Why isn't Oracle using my index?" must be one of the most popular (or perhaps unpopular) questions ever asked on the Oracle help forums.…
Specifikacia Cost-Based Oracle Fundamentals - Jonathan Lewis
Cost-Based Oracle Fundamentals - Jonathan Lewis
The question, "Why isn't Oracle using my index?" must be one of the most popular (or perhaps unpopular) questions ever asked on the Oracle help forums. What could possibly be going wrong? You've picked exactly the right columns, you've got them in the ideal order, you've computed statistics, you've checked for null columnsand the optimizer flatly refuses to use your index unless you hint it.
If you've suffered the frustration of watching the optimizer do something completely bizarre when the best execution plan is totally obvious, or spent hours or days trying to make the optimizer do what you
Cost Reduction Analysis
Cost-Benefit Analysis
Fundamentals
Oracle