Database Administration Development Tutorials, Guides & Insights

Indexes are data structures that improve the speed of data retrieval operations on a database table. They are similar to the index in a book, which allows you to quickly find specific topics without scanning every page. In MySQL, indexes can be applied to columns to speed up queries involving those columns.

Indexes can be created when a table is first created or added later using the CREATE INDEX statement.

Importing and exporting data are essential tasks in database management, enabling data transfer between different systems and backup management. MySQL provides several tools and techniques for efficient data import and export. This tutorial will guide you through various methods to handle data in MySQL.

• Basic knowledge of MySQL and SQL operations.
• Access to a MySQL server.
• Familiarity with command-line tools and basic server administration.

Percona PMM is a free, open-source platform for managing and monitoring MySQL databases.

• Query Analytics: Provides insights into query performance and optimization opportunities.
• System Monitoring: Tracks server health, including CPU, memory, and disk usage.

• Locks: MySQL automatically locks the necessary rows during transactions to prevent conflicts. However, you can manually acquire locks using the LOCK TABLES command if needed.
• Deadlocks: Occur when two or more transactions block each other. MySQL automatically detects deadlocks and rolls back one of the transactions.

LOCK TABLES accounts WRITE;

-- Perform operations here

UNLOCK TABLES;

This query will output the largest table in the specified database along with its size.

After executing these queries, you'll have a clear understanding of the total size of your database and which table is consuming the most space. This information can help you make informed decisions about database optimization and storage planning.