3652
MariaDBERRORNotableDDLHIGH confidence
Too many indexes defined on table (variant 2)
Production Risk
Low — DDL fails; existing indexes remain unchanged.
How to reproduce
trigger — this will error
trigger — this will error
-- ALTER TABLE adding the 65th index to an InnoDB table
expected output
ERROR 3652 (HY000): Too many indexes defined on table.
Fix
Audit and remove redundant indexes
Audit and remove redundant indexes
SELECT INDEX_NAME, COLUMN_NAME FROM information_schema.STATISTICS WHERE TABLE_NAME = 'your_table' AND TABLE_SCHEMA = DATABASE() ORDER BY INDEX_NAME;
Why this works
Lists all indexes for review and consolidation.
What not to do
✕
Version notes
Sources
Official documentation ↗
MySQL 8.0 — 3652 ER_TOO_MANY_KEYS2
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