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virtual column

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Lobster Programming
Lobster Programming
Jun 13, 2024 · Databases

Boost MySQL Join Performance with Wide Tables and JSON Virtual Columns

This article explains how to accelerate slow MySQL join queries in high‑traffic e‑commerce fulfillment systems by using wide tables, MySQL JSON columns, virtual columns, and indexed expressions, comparing their trade‑offs and providing practical SQL examples.

Database OptimizationIndexingJSON
0 likes · 5 min read
Boost MySQL Join Performance with Wide Tables and JSON Virtual Columns
Architect
Architect
Oct 11, 2020 · Databases

Understanding Index Usage, Slow Queries, and Optimization Techniques in MySQL

This article explains why using indexes does not guarantee fast queries, analyzes slow‑query causes such as full index scans and poor filter selectivity, and demonstrates advanced MySQL optimizations including virtual columns and index condition push‑down to reduce row scans and costly table lookups.

DatabaseIndexMySQL
0 likes · 12 min read
Understanding Index Usage, Slow Queries, and Optimization Techniques in MySQL
Top Architect
Top Architect
Aug 13, 2020 · Databases

Understanding Index Usage and Slow Queries in MySQL

This article explains why using indexes does not guarantee fast queries in MySQL, analyzes full index scans, index selectivity, the cost of row look‑ups (back‑to‑table), and presents optimization techniques such as index condition pushdown and virtual columns to improve performance.

Database OptimizationEXPLAINIndex
0 likes · 13 min read
Understanding Index Usage and Slow Queries in MySQL
Aikesheng Open Source Community
Aikesheng Open Source Community
May 5, 2019 · Databases

MySQL Function Indexes: Scenarios, Implementation, and Performance Comparison

This article explains MySQL function indexes (implemented via virtual columns), demonstrates five common query scenarios—date filtering, arithmetic on two fields, substring extraction, suffix matching, and JSON value extraction—shows how to create the indexes, compares execution plans and performance with regular indexes, and highlights the strict syntax requirements for optimal use.

DatabaseFunction IndexMySQL
0 likes · 7 min read
MySQL Function Indexes: Scenarios, Implementation, and Performance Comparison