The Ultimate Guide to High Availability with MariaDB
This is a read-only copy of the MariaDB Knowledgebase generated on 2024-11-14. For the latest, interactive version please visit https://mariadb.com/kb/.

Error 1821: Failed to add the foreign key constaint. Missing index for constraint in the foreign table

Error CodeSQLSTATEErrorDescription
1821HY000ER_FK_NO_INDEX_CHILDFailed to add the foreign key constaint. Missing index for constraint '%s' in the foreign table '%s'

Contents

  1. Possible Causes and Solutions

Possible Causes and Solutions

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