I’ve revamped a few of the recommendations in MySQLTuner, and revision 19 is now available tonight! Here’s the main changes:
* Adjusted infoprint to use asterisks (cosmetic)
* Per-thread/global buffer counts are now displayed
* Key buffer increases are only recommended if the buffer is smaller than total indexes and hit rate is < 95%
* Dropped max_seeks_for_key checks
* Temporary table size increases are not recommended over 256M
* Aborted connection calculation and recommendation adjustments
You can download the latest copy on the MySQLTuner page, and you can get diffs for the new version as well.
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Thanks, this is awesome!
I’m glad you like it!
Let me know if you have any suggestions for updates.
This script is handy for a quick check on the health of a mysql instance. I modified the script to skip suggesting turning on concurrent inserts for SMP systems. Also I added a check to determine whether the innodb buffer and the innodb aditional memory pool ((nnodb buffer / 20) + whatever to get divisible by 16).
I am curious why the 85% threshold for MySQL memory usage?
I use the 85% threshold as I’ve found it to be a good average for most shared hosting environments. However, if the server is a dedicated MySQL server, the threshold could be increased to 90 or 95% of system memory. For servers running web applications that use a lot of memory, like Java or Ruby on Rails, the threshold may need to be lowered to allow for better stability of the whole system.