Search results: mysql

MySQL Database Performance: Avoid this common mistake

One frequent topic of support request emails I receive is MySQL database performance. Clients complain about MySQL using too much server memory, too many MySQL slow queries, the famous Mysql server has gone away error and many other MySQL performance related issues. As such, I wanted to quickly share the solution to a common MySQL configuration […]

“MySQL server has gone away” error – Solution(s)

MySQL server has gone away error means that MySQL server (mysqld) timed out and closed the connection. By default, MySQL will close connections after eight hours (28800 seconds) if nothing happens. However, in some cases, your web host, DBA, or app developer may have decreased this timeout setting, discussed below. MySQL server has gone away, can be […]

Tuning MySQL: my.cnf, avoid this common pitfall!

Caution: Don’t overwrite my.cnf all at once. Backup data and config, make one or two changes per restart, test extensively. It took me some time to decide the title for this article. MariaDB has been fast replacing MySQL as a growing number of Linux distributions now default to MariaDB over MySQL. MariaDB is an enhanced drop-in replacement […]

MySQL Query Cache for Performance, Avoid This When Tuning

Update: MySQL query cache is deprecated as of MySQL 5.7.20, and is removed in MySQL 8.0. – mysql.com One of the most misconfigured MySQL performance features is MySQL query_cache_size. This post references a web server with 32 gigabytes of RAM where the existing config had MySQL’s query cache size set incorrectly to 4 gigabytes. The thought behind it seemed […]

MySQL Performance: Stop hoarding. Drop unused MySQL databases

Last year, I was assisting a new client in addressing MySQL performance issues. There were several areas where MySQL performance issues were addressed. One issue overlooked for several years prior to our communications, was that of keeping around unused databases. Over 15GB of unused MySQL data – a mix of MyISAM and Innodb tables – […]

MySQL Performance Tuning: Tips, Scripts and Tools

With MySQL, common configuration mistakes can cause serious performance problems. In fact, if you mis-configure just one of the many config parameters, it can cripple performance! Of course, the performance of MySQL is often tied greatly to the efficiency of your MySQL queries. It’s important to ensure that your performance issues are not due to […]

Download LEMP for Raspberry Pi: Nginx + MariaDB (MySQL) + PHP

Download latest image: https://sourceforge.net/projects/lemp-raspberry-pi/files/latest/download Change log 07-16-2014 – After today’s changes RAM usage on first boot is down to <100mb. 07-16-2014 – Set most logs to save to memory instead of SD card. (up to 10M or 1 day max) 07-16-2014 – Reduced system log level from “info” to “warning”. Reduce SD contention. 07-16-2014 – Uninstalled ntpd daemon. Replaced […]

Free Nginx AMI (LEMP) – CentOS, Nginx, MySQL & PHP-FPM

Note: This Free Nginx AMI has been merged into Nginx’s official AMI. This Amazon EC2 AMI includes the latest Amazon Linux (Centos), Nginx 1.0.15, MySQL 5.1 & PHP 5.4 (PHP-FPM) custom installed and tuned for stability and speed. Screenshot of top stats. This free Nginx AMI is optimized and runs fast even on t1.micro. To […]