Sql Programming Tutorials, Guides & Best Practices

To create an index on a single column, use the following syntax:

CREATE INDEX index_name ON table_name(column_name);

To enable the slow query log, add the following lines to your my.cnf or my.ini file:

[mysqld]
slow_query_log = ON
slow_query_log_file = /path/to/slow-query.log
long_query_time = 2

EXPLAIN SELECT * FROM users WHERE user_id = 1;

The output provides details like:

You can set the isolation level for the current session or globally to affect all new connections.

Concurrency control is essential in multi-user databases to prevent conflicts and ensure data integrity. MySQL uses locks and other mechanisms to manage concurrency.

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.