Why is MySQL running slow?

If your database is being used in high volumes, this can slow the database down. When there are too many queries to process at once, the CPU will bottleneck, resulting in a slow database.

How do you make MySQL run faster?

Tips to Improve MySQL Query Performance

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

How do I fix slow queries in MySQL?

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.

How do I troubleshoot MySQL performance issues?


  1. Check if the MySQL slow query log is enabled. …
  2. Shut down the Atlassian applications which use the suspected MySQL server.
  3. Enable the MySQL slow query log. …
  4. Restart MySQL after doing this.
  5. Start your Atlassian application back up.
  6. Wait till your Atlassian application has gone through a period of poor behavior.
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What is MySQL slow query?

The slow query log consists of SQL statements that take more than long_query_time seconds to execute and require at least min_examined_row_limit rows to be examined. The slow query log can be used to find queries that take a long time to execute and are therefore candidates for optimization.

Is SQL Server faster than MySQL?

For the INSERT operations, MySQL worked faster than SQL Server. For transaction processing, MySQL is fast. With the help of its InnoDB storage engine, MySQL can handle high concurrency for transactions. However, MySQL struggles with reporting workloads, mainly when there are queries that need to join large tables.

How do you fix a slow query?

How to fix slow queries

  1. Examining your website for query performance issues.
  2. Resolving query performance issues.
  3. Use caching.
  4. Alter the query.
  5. Disable or remove the query.
  6. Monitor the server.

How do I cache a MySQL query?

MySQL determines the queries to cache by examining the query_cache_type variable. Setting this value to 0 or OFF prevents caching or retrieval of cached queries. You can also set it to 1 to enable caching for all queries except for ones beginning with the SELECT SQL_NO_CACHE statement.

WHERE is slow query in SQL Server?

3 Answers

  1. Open SQL Server Profiler (in Performance Tools)
  2. File -> New Trace…
  3. Connect to your database.
  4. Click the Events Selection tab.
  5. Select only events which correspond to SQL queries finishing: …
  6. Click Column Filters…
  7. Click Duration in the list.

How do I monitor MySQL performance?

Top 6 Tools to Monitor MySQL Databases

  1. Sematext MySQL Monitoring. Sematext is a full-stack observability solution MySQL monitoring capabilities. …
  2. Percona Monitoring and Management Tool (PMM) …
  3. VividCortex MySQL Analyzer. …
  4. MySQL Enterprise Monitor. …
  5. Datadog MySQL. …
  6. Prometheus and MySQLD Exporter.
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What optimize table does in MySQL?

OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table. The exact changes made to each table depend on the storage engine used by that table.

How can you tell MySQL performance issues with slow queries?

Analyzing Slow Queries Using ClusterControl

  1. Top Queries – aggregated list of all your top queries running on all the nodes of your database cluster.
  2. Running Queries – View current running queries on your database cluster similar to SHOW FULL PROCESSLIST command in MySQL.
  3. Query Outliers – Shows queries that are outliers.