Table of Contents
Why does MySQL consume so much memory?
MySQL tries to allocate more memory than available because we specifically told it to do so. For example: you did not set innodb_buffer_pool_size correctly. This is very easy to fix. There is some other process(es) on the server that allocates RAM.
How do I reduce MySQL memory usage?
How to reduce the memory usage of MySQL
- Identify the parameters you will want to modify in order to restrict MySQL memory usage. Launch the script that you can find at the bottom of this tutorial.
- Locate your my.cnf file. This is the file where you will overwrite mysql options.
- Make your changes.
How much RAM should MySQL use?
The default configuration is designed to permit a MySQL server to start on a virtual machine that has approximately 512MB of RAM. You can improve MySQL performance by increasing the values of certain cache and buffer-related system variables.
How do I know if my MySQL memory Utilisation is high?
The most basic procedures are check processlist, check server status, and check the storage engine status. To do these things, basically, you have just to run the series of queries by logging in to MySQL.
What happens when MySQL runs out of memory?
The ‘Out of memory’ error is a pretty straight forward message that shows that the server is running short of memory. The memory allocated to MySQL service isn’t enough to handle the process requirements. And the easiest way out, is to examine server memory and upgrade the RAM.
How do I allocate more RAM to MySQL?
Allocating RAM for MySQL – The Short Answer If using just MyISAM, set key_buffer_size to 20\% of available RAM. (Plus innodb_buffer_pool_size=0) (You should be moving away from MyISAM.) If using just InnoDB, set innodb_buffer_pool_size to 70\% of available RAM. (Plus key_buffer_size = 10M, small, but not zero.)
Is 4gb RAM enough for MySQL?
64MB should be enough for most queries. The only time you need to worry about the RAM is when your query time is too long, only after you have done other optimizations such as indexing. Increasing the RAM if you see that many of your queries are going to the disk often. For development work, 64MB is plenty.
What is open files limit in MySQL?
The default ulimit (maximum) open files limit is 1024 Which is very low, especially for a web server environment hosting multiple heavy database driven sites. This ulimit ‘open files’ setting is also used by MySQL.
How do I flush a table in MySQL?
To flush and lock tables, use FLUSH TABLES tbl_name WITH READ LOCK instead. With a list of one or more comma-separated table names, this operation is like FLUSH TABLES with no names except that the server flushes only the named tables. If a named table does not exist, no error occurs.