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How do I fix slow queries in MySQL?

Contents
  1. Why is my MySQL query so slow?
  2. How can I make MySQL query run faster?
  3. How would you diagnose slow MySQL queries on that database?
  4. How do you fix a slow query?
MySQL has a built-in slow query log. To use it, open the my. cnf file and set the slow_query_log variable to "On." Set long_query_time to the number of seconds that a query should take to be considered slow, say 0.2. Set slow_query_log_file to the path where you want to save the file. 1 мая 2017 г.


Why is my MySQL query so slow?

Queries can become slow for various reasons ranging from improper index usage to bugs in the storage engine itself. However, in most cases, queries become slow because developers or MySQL database administrators neglect to monitor them and keep an eye on their performance.

How can I make MySQL query run faster?

Tips to Improve MySQL Query Performance1Optimize Your Database. You need to know how to design schemas to support efficient queries. ... 2Optimize Joins. Reduce the join statements in queries. ... 3Index All Columns Used in 'where', 'order by', and 'group by' Clauses. INDEXES. ... 4Use Full-Text Searches. ... 5MySQL Query Caching.

How would you diagnose slow MySQL queries on that database?

Checking Your Slow Query Logs MySQL has the capability to filter and log slow queries. There are various ways you can investigate these, but the most common and efficient way is to use the slow query logs. You need to determine first if your slow query logs are enabled.

How do you fix a slow query?

SQL Server uses nested loop, hash, and merge joins. If a slow-performing query is using one join technique over another, you can try forcing a different join type. For example, if a query is using a hash join, you can force a nested loops join by using the LOOP join hint.

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