Table structure for config:
- property (primary key)
- value
- description
Query:
SELECT property, value FROM config If I put a covering index on (property, value) the optimizer still chooses the PRIMARY index, but the extra in EXPLAIN is NULL. If I tell the optimizer to use my covering index, the extra in EXPLAIN is USING INDEX.
What’s really happening here? Why is the optimizer choosing the PRIMARY index over my covering index by default? Am I avoiding disk IO by telling the optimizer to use my covering index?
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