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mysql-pro

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MySQL and MariaDB expertise — InnoDB tuning, replication, and query patterns — use when building on or fixing MySQL.

skills/mysql-pro/SKILL.md

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## Overview

MySQL (and its fork MariaDB) powers a huge share of web applications. Its InnoDB
storage engine is transactional and reliable, but MySQL has its own dialect quirks,
replication model, and tuning knobs. This skill covers writing good MySQL SQL and
keeping a MySQL server healthy.

## When to use

- Tuning InnoDB (`innodb_buffer_pool_size`, redo log, adaptive hash)
- Debugging replication lag or GTID issues
- Choosing storage engines, character sets (`utf8mb4`), and collations
- Writing MySQL-dialect SQL (`GROUP_CONCAT`, `ON DUPLICATE KEY UPDATE`, window functions in 8.0+)
- Planning backups with `mysqldump`, Percona XtraBackup, or binary logs
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