Hi! On 1 Jun 2014, at 17:37, s.kelly@pivotaltechnologies.com.au wrote:
I have recently moved from an older version of Mysql to MariaDB, I have a few queries which use internal tmp tables (according to EXPLAIN) and the performance is almost un-usable on MariaDB for some reason. Is there anything different in MariaDB that would be causing this issue. The version I am using is: Ver 15.1 Distrib 10.0.10-MariaDB.
What are your aria engine settings in my.cnf out of curiosity? Try setting join_cache_level = 0 Please also provide @@optimizer_switch output Thanks P/S: what was the older version of mysql that you're referring to?
Here is the explain from the query: +------+-------------+-------+-------+---------------+----------+---------+------+------+-------------------------------------------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+-------+-------+---------------+----------+---------+------+------+-------------------------------------------------------------------------------+ | 1 | SIMPLE | plots | range | plot_IDX | plot_IDX | 4 | NULL | 2939 | Using index condition; Using temporary; Using filesort | | 1 | SIMPLE | plots | range | plot_IDX | plot_IDX | 4 | NULL | 2939 | Using index condition; Using where; Using join buffer (flat, BNL join) | | 1 | SIMPLE | plots | range | plot_IDX | plot_IDX | 4 | NULL | 2939 | Using index condition; Using where; Using join buffer (incremental, BNL join) | | 1 | SIMPLE | plots | range | plot_IDX | plot_IDX | 4 | NULL | 2939 | Using index condition; Using where; Using join buffer (incremental, BNL join) | | 1 | SIMPLE | plots | range | plot_IDX | plot_IDX | 4 | NULL | 2939 | Using index condition; Using where; Using join buffer (incremental, BNL join) | | 1 | SIMPLE | plots | range | plot_IDX | plot_IDX | 4 | NULL | 2939 | Using index condition; Using where; Using join buffer (incremental, BNL join) | +------+-------------+-------+-------+---------------+----------+---------+------+------+-------------------------------------------------------------------------------+
To give you an idea, the exact same query on the old version of mysql took about 1 second, this version of MariaDB is taking 1min 48secs on the same hardware. Any help would be appreciated.
Thanks Steve.
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