Understanding InnoDB Delete Behavior and Space Reclamation with OPTIMIZE TABLE

This article explains how MySQL's InnoDB engine marks rows as deleted without freeing disk space, demonstrates the issue with 100,000 rows, and shows how the OPTIMIZE TABLE or ALTER TABLE commands can rebuild the table to reclaim space and improve performance.

DELETEDatabase PerformanceInnoDB

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Understanding InnoDB Delete Behavior and Space Reclamation with OPTIMIZE TABLE

ITPUB

Apr 29, 2016 · Databases

How to Clean Up MySQL Table Fragmentation with OPTIMIZE and ALTER

This guide explains why MySQL tables become fragmented, how to detect fragmentation using information_schema queries, and how to defragment tables safely with OPTIMIZE, ALTER TABLE, or MySQL startup options while noting engine‑specific behavior and best‑practice cautions.

ALTER TABLEInnoDBMyISAM

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How to Clean Up MySQL Table Fragmentation with OPTIMIZE and ALTER