Ideas, releases, practical guides, and perspectives from the people building with MySQL.
In this podcast, we’ll explore the issue of duplicate indexes in MySQL; including redundant index, foreign keys, left-prefixed secondary index /w primary key, and how to tackle the issue at…
The post Podcast: Duplicate Indexes in MySQL first appeared on Change Is Inevitable.
Indexes are crucial for optimizing query execution times in databases, but having an excessive number of indexes, or redundant ones, can negatively impact performance. While pt-duplicate-key-checker is the go-to tool for identifying duplicate or redundant indexes in MySQL, it may not catch all duplicates.
In this blog post, we’ll put ourselves to the test and see if we can identify duplicate and redundant indexes in MySQL. Toward the end, we will identify what the pt-duplicate-key-checker doesn’t.
The unique quiz
Consider the following MySQL table definition. Let’s put our brains to work and note any of the duplicate or redundant indexes (play fair, don’t cheat):
CREATE TABLE `table_with_lot_of_trouble` ( `id` int NOT NULL, `col1` varchar(1) DEFAULT NULL, `col2` varchar(2) DEFAULT NULL, `col3` varchar(3) …[Read more]
Here at the MySQL Performance Blog, we’ve been discussing the several new features that MySQL 5.6 brought: GTID-based replication, InnoDB Fulltext, Memcached integration, a more complete performance schema, online DDL and …
[Read more]