Understanding Index Prefix Length Limits in MySQL 8.0 and 5.7

This article explains MySQL's index prefix length restrictions for BLOB/TEXT columns in versions 8.0 and 5.7, demonstrates verification experiments showing the 767‑byte and 3072‑byte limits for different InnoDB row formats, and discusses the underlying design implications.

Database designInnoDBPrefix Length

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Understanding Index Prefix Length Limits in MySQL 8.0 and 5.7