The JusDB Database Engineering Blog
Deep dives on PostgreSQL, MySQL, MongoDB and more — performance tuning, high availability, migrations and production war stories from our DBAs.
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MySQL Invisible Indexes: Drop an Index Safely
Test an index drop on MySQL 8.4 before you commit to it: find unused candidates on every server, hide one with ALTER INDEX INVISIBLE, compare plans, and drop it with a rollback.
MySQL18 minOct 28, 2026
ReadMySQL Histograms: When the Optimizer Needs Them
Learn when a MySQL histogram beats an index, how to build one with ANALYZE TABLE, how to read its effect in EXPLAIN, and how to keep it fresh with AUTO UPDATE.
MySQL20 minOct 28, 2026
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