Sql Programming Tutorials, Guides & Best Practices

For example, to create a composite index on first_name and last_name:

CREATE INDEX idx_name ON users(first_name, last_name);

mysqldump -u your_username -p your_database_name > backup.sql

• your_username: Your MySQL username.
• your_database_name: The name of the database you want to export.
• backup.sql: The file where the exported data will be saved.

You can query various tables within the Performance Schema to gain insights into your database performance. For example, to see the top 10 queries by execution time, use:

SELECT * FROM performance_schema.events_statements_summary_by_digest
ORDER BY SUM_TIMER_WAIT DESC
LIMIT 10;

MySQL provides different isolation levels to control how transactions interact with each other. Each level offers a different balance between data consistency and performance:

SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;

To view the size of a specific database, you'll query the information_schema.tables table. This table contains metadata about all the tables in your databases.

Execute the following query, replacing your_database_name with the name of your database: