4123
MariaDBERRORNotableHIGH confidence
Too many columns in table definition
Production Risk
Low — DDL fails; no data is affected.
Why it happens
- 1A CREATE TABLE or ALTER TABLE attempts to define more than 4096 columns.
Fix
Normalize the table structure to reduce column count
Why this works
Split wide tables into related tables using a 1:1 relationship to stay within column limits.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 4123 ER_TOO_MANY_FIELDS2
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