I am looking at switching from MySQL to MariaDB and have been comparing the performance of the two.

I am using the same databases on the same Windows machine and running queries using MySQL and MariaDB

and I am finding that MariaDB is 6 times slower. A query that takes 5 seconds on MySQL is taking 28 seconds on MariaDB.

 

I am hoping I have some configuration wrong, so I looking for some help to work out what needs changing.

 

One of the problem queries is a join between two tables. Analyzing the query gives..

 

ANALYZE FORMAT=JSON SELECT r.rushid FROM rushes r LEFT JOIN browse b ON r.rushID = b.rushID WHERE b.rushID IS NULL AND r.updated < NOW() - INTERVAL 1 DAY;

+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------+

| ANALYZE

                                                                                       |

+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------+

| {

  "query_block": {

    "select_id": 1,

    "r_loops": 1,

    "r_total_time_ms": 107974,

    "table": {

      "table_name": "r",

      "access_type": "ALL",

      "r_loops": 1,

      "rows": 784286,

      "r_rows": 784286,

      "r_total_time_ms": 245.5,

      "filtered": 100,

      "r_filtered": 100,

      "attached_condition": "r.updated < '2020-05-31 16:35:59'"

    },

    "table": {

      "table_name": "b",

      "access_type": "ref",

      "possible_keys": ["rushid_start", "rushid"],

      "key": "rushid",

      "key_length": "96",

      "used_key_parts": ["rushID"],

      "ref": ["quentin_v3afp.r.rushID"],

      "r_loops": 784286,

      "rows": 10,

      "r_rows": 1,

      "r_total_time_ms": 106252,

      "filtered": 100,

      "r_filtered": 100,

      "attached_condition": "trigcond(b.rushID is null)",

      "using_index": true,

      "not_exists": true

    }

  }

} |

+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------+

1 row in set (1 min 48.244 sec)

 

The table has been converted to the Aria engine from MyISAM. The my.ini file has had the following added/changed..

 

#Not using MyISAM so save memory

key_buffer_size=64k

 

#Setting to improve Aria performance

aria_pagecache_buffer_size=4007M

 

tmp_table_size=35M

max_heap_table_size=35M

 

 

 

Thanks for any help.

 

Andy Ling

 

 

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