Hi Jocelyn, The article you linked is quite old, so I wanted to check the source code to find if something changed. I didn't investigate much but I searched in MariaDB's master branch via GitHub. The search strings were 'read_rnd_buffer_size' and 'read-rnd-buffer-size'. I found nothing except for some test files and the variable initialization at server startup. I repeated the same searches in MySQL master branch, and again, I found only tests and initialization. Can you explain this? The variable is unused now? Federico -------------------------------------------- Lun 24/4/17, jocelyn fournier <jocelyn.fournier@gmail.com> ha scritto: Oggetto: Re: [Maria-discuss] Are some MyISAM settings used for Aria A: "Sales" <info@smallbusinessconsultingexperts.com> Cc: "Maria Discuss" <maria-discuss@lists.launchpad.net> Data: Lunedì 24 Aprile 2017, 09:16 Hi Steve, Le 24 avr. 2017 3:28 AM, "Sales" <info@smallbusinessconsultingexperts.com> a écrit : On Apr 23, 2017, at 4:12 PM, jocelyn fournier <jocelyn.fournier@gmail.com> wrote: Hi Steve, Le 23/04/2017 à 19:32, Sales a écrit : On our system, Mariadb 10.1.22, with aria_used_for_temp_tables = ON, we have a set of MyISAM settings carried over from an earlier setup. Those settings are: key_buffer_size=256M myisam_sort_buffer_size = 64M join_buffer_size=512K bulk_insert_buffer_size=512M read_rnd_buffer_size = 1M read_rnd_buffer_size and join_buffer_size are not MyISAM specific settings, did you try to modify/not modify only those ones ? HTH, Jocelyn Really? So, the doc is wrong? https://mariadb.com/kb/en/ mariadb/server-system- variables/#read_rnd_buffer_ size Says, MyISAM. So, are you saying that is mistaken? If so, that would make sense At least according to https://www.percona.com/blog/2007/07/24/what-exactly-is-read_rnd_buffer_size... it's not. BTW it has been updated in the mysql manual to mention it optimizes mrr for any engine :https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_... MariaDB KB would need an update as well. Jocelyn _______________________________________________ Mailing list: https://launchpad.net/~maria-discuss Post to : maria-discuss@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-discuss More help : https://help.launchpad.net/ListHelp