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Displaying posts with tag: systemd (reset)
systemd Centos7 => MySQL/MariaDB

As the systemd integration keeps on getting forward. It is hardly to be ignored by us MySQL folks :)

Lets have a look into a simple problem, you are not going to solve like you used to solve it. (At least on Centos7 installing the MariaDB package)

Increasing table_open_cache was only a configuration issue. As mysqld was started as root and then switching to the unix user mysql. On Centos7 this was not working anymore. As MariaDB/MySQL ist startet with a service file starting the process as user mysql:


As not root (having the right capability) it will be not able to change the open files limit. In the error log you are going to find something like:

150303 11:57:02 [Warning] Changed limits: max_open_files: 1024  
 max_connections: 214  table_cache: 400

Reading the …

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Logging with MySQL: Error-Logging to Syslog & EventLog

You’ve already read it in What’s new in 5.7 (So Far) — the MySQL server now has new-and-improved supported for syslog (on unix-like systems) and EventLog (on Windows). In the next few paragraphs, we’ll take a look at what they are, what has changed, and how they can make your life easier.

The MySQL server supplies information in two main ways:

  1. The client will receive a reply to every statement. If everything goes right, then we’ll see a simple OK for success, or a result set for SELECT, SHOW, etc.; and even a successful statement may be qualified by a set of warnings or notices. If the statement fails for some reason then we’ll receive an error regarding the failure.
  2. On the server, we’ll see a variety of logs depending on the server configuration. Queries exceeding a certain execution …
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