.
Then, what is query profiling?
Query profiling means evaluating the performance of a particular SQL query. Typically this begins with the explain plan in which the query optimizer provides useful information about how the query will be executed by the RDBMS without actually executing it.
Also Know, what is MySQL slow log? The MySQL slow query log is where the MySQL database server registers all queries that exceed a given threshold of execution time. This can often be a good starting place to see which queries are slowest and how often they are slow. MySQL on your server is configured to log all queries taking longer than 0.1 seconds.
Just so, how do I trace a MySQL query?
How to trace MySQL queries
- Check live queries. Login your MySQL server run this query to check live queries: mysql> SHOW PROCESSLIST;
- Check live queries in an interval time. For example, we want see the live queries every 5 seconds mysqladmin -u test -p -i 5 processlist.
- Check queries log. mysql> SHOW VARIABLES LIKE "general_log%";
What is performance schema in MySQL?
The MySQL Performance Schema is a feature for monitoring MySQL Server execution at a low level. The Performance Schema provides a way to inspect internal execution of the server at runtime. It is implemented using the PERFORMANCE_SCHEMA storage engine and the performance_schema database.
Why is query important in database?
How do I view MySQL logs?
- edit /etc/my.cnf [mysqld] log=/tmp/mysql.log.
- restart the computer or the mysqld service service mysqld restart.
- open phpmyadmin/any application that uses mysql/mysql console and run a query.
- cat /tmp/mysql.log ( you should see the query )
