4125
MySQLERRORNotableHIGH confidence
String value is too long for column
Production Risk
Medium — Write operations fail for affected rows.
Why it happens
- 1The data being inserted exceeds the VARCHAR or CHAR column length.
- 2String truncation is not enabled in the current sql_mode.
Fix 1
Increase the column length
Increase the column length
ALTER TABLE t MODIFY col VARCHAR(500);
Why this works
Expanding the column definition accommodates longer string values.
Fix 2
Truncate or validate data before insertion
Why this works
Ensure application-layer validation enforces the maximum column length before writing to the database.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 4125 ER_TOO_LONG_STRING2
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