#MYSQL OPTIMIZER SCRIPT MANUAL#
#MYSQL OPTIMIZER SCRIPT UPGRADE#
#MYSQL OPTIMIZER SCRIPT FULL#

Innodb_flush_log_at_trx_commit = 1 # may change to 2 or 0 As per these tips, add this to the config file under the section: innodb_buffer_pool_size = 1G # (adjust value here, 50%-70% of total RAM)

#MYSQL OPTIMIZER SCRIPT MANUAL#

The following manual tweaks should be made out of the box. Note: modify the above path to match the config file’s real location – it’s possible that it’s actually in /etc/mysql//mysqld.cnf Manual Tweaks Otherwise, use a simple text editor like vim by executing sudo vim /etc/mysql/my.cnf. If you’re editing locally on a Vagrant box, you can copy the file out into the main filesystem by copying it into the shared folder with cp /etc/mysql/my.cnf /home/vagrant/Code and editing it with a regular text editor, then copying it back into place when done. Even if you haven’t been exposed to it yet, now is as good a time as any.

You’ll need to be comfortable with using the command line. It’s possible that your installation will actually load a secondary configuration file into that configuration file, so look into that – if the my.cnf file doesn’t have much content, the file /etc/mysql//mysqld.cnf might. We’ll assume you’re using a Linux-based host or a good Vagrant box like our Homestead Improved so your configuration file will be in /etc/mysql/my.cnf. 5.7 (the current version) has much better defaults than its predecessors, but it’s still easy to make improvements on top of those.

#MYSQL OPTIMIZER SCRIPT UPGRADE#

Using an Exception Tracking software ( such as Tideways) you can log which users, transactions or pages are causing these queries to get aborted, how often they happen and if the query performance can be improved.The first – and most skipped! – performance upgrade every user of MySQL should do is tweak the configuration. You can handle this error centrally in your application and display message to users that the response took too long and was aborted. If your query takes to long, it fails with the following error: ERROR 3024 (HY000): Query execution was interrupted, maximum statement execution time exceeded

The timeouts only apply to read-only SELECT queries. Or you can set a session-wide or global timeout: SET SESSION MAX_EXECUTION_TIME=2000 SET GLOBAL MAX_EXECUTION_TIME=2000 SELECT /*+ MAX_EXECUTION_TIME(1000) */ status, count(*) FROM articles GROUP BY status ORDER BY status With MySQL 5.7 you can now use a new optimizer query hint to configure the max execution time of SELECT queries in Milliseconds. This certainly works, but you don’t know who is running the query and why, which prevents you from applying more fine granular timeouts based on the context (web vs background process for example). When you Google this problem, the recommended solution is running a daemon or cronjob that monitors the processlist and just kills the long running queries.

This means your PHP scripts and MySQL connections can be blocked as long as a query runs, worst case for several minutes or hours. In addition the PHP max_execution_time does not apply to waiting for network calls as shown in this previous blog post on max_execution_time. Up until MySQL 5.7 you had no easy way to protect yourself from large amounts of users DDoSing your database with long running queries.

You may not have suffered database overload and slowdowns yet, only because your users aren’t constantly using these features. If you provide advanced search, aggregated statistics, reporting or data export functionality in your application, then the occasional long running query is part of the design.

#MYSQL OPTIMIZER SCRIPT FULL#

If it contains just the wrong number of conditions in your advanced search form triggering a full table scan on a dataset that is much larger than you have anticipated they probably can. You may be wondering if your users can slow down or even DOS your MySQL database with an unlucky request. Use timeouts to prevent long-running SELECT queries from taking down your MySQL

Mysql optimizer script