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Re: Poor performance compared to MySQL

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MariaDB is 10.4.12

MySQL is 5.5.34 – pretty old I know.

Regards

Andy Ling

From: Vicențiu Ciorbaru [mailto:vicentiu@xxxxxxxxxxx]
Sent: Tue 02 June 2020 12:08
To: Ling, Andy <Andy.Ling@xxxxxxxxxxxxxxx>
Cc: Gordan Bobic <gordan.bobic@xxxxxxxxx>; Mailing-List mariadb <maria-discuss@xxxxxxxxxxxxxxxxxxx>
Subject: [EXTERNAL] Re: [Maria-discuss] Poor performance compared to MySQL


External Message:Use caution before opening links or attachments
For completeness, can you specify which versions of MySQL & MariaDB you are comparing?

I assume both servers are running on the same hardware (not an SSD for MySQL and a hard drive for MariaDB), is that correct?
As this is a time-related query, did you run both queries using the same data & roughly the same time of day?

Also, since the query plans are the same and it's not a storage engine issue (myisam - myisam is still slower on MariaDB's side), I need to check if there was anything Windows specific that was changed in MariaDB.

Vicențiu

On Tue, 2 Jun 2020 at 13:58, Ling, Andy <Andy.Ling@xxxxxxxxxxxxxxx<mailto:Andy.Ling@xxxxxxxxxxxxxxx>> wrote:
mysql> EXPLAIN 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;
+----+-------------+-------+------+---------------+--------------+---------+---------------------+--------+--------------------------------------+
| id | select_type | table | type | possible_keys | key          | key_len | ref                 | rows   | Extra                                |
+----+-------------+-------+------+---------------+--------------+---------+---------------------+--------+--------------------------------------+
|  1 | SIMPLE      | r     | ALL  | NULL          | NULL         | NULL    | NULL                | 784286 | Using where                          |
|  1 | SIMPLE      | b     | ref  | rushid_start  | rushid_start | 96      | quentin_v3.r.rushID |     10 | Using where; Using index; Not exists |
+----+-------------+-------+------+---------------+--------------+---------+---------------------+--------+--------------------------------------+
2 rows in set (0.00 sec)

MariaDB [quentin_v3]> EXPLAIN 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;
+------+-------------+-------+------+---------------+--------------+---------+---------------------+--------+--------------------------------------+
| id   | select_type | table | type | possible_keys | key          | key_len | ref                 | rows   | Extra                                |
+------+-------------+-------+------+---------------+--------------+---------+---------------------+--------+--------------------------------------+
|    1 | SIMPLE      | r     | ALL  | NULL          | NULL         | NULL    | NULL                | 784286 | Using where                          |
|    1 | SIMPLE      | b     | ref  | rushid_start  | rushid_start | 96      | quentin_v3.r.rushID | 10     | Using where; Using index; Not exists |
+------+-------------+-------+------+---------------+--------------+---------+---------------------+--------+--------------------------------------+
2 rows in set (0.001 sec)


Look pretty similar.

Regards

Andy Ling



From: Maria-discuss [mailto:maria-discuss-bounces+andy.ling<mailto:maria-discuss-bounces%2Bandy.ling>=grassvalley.com@xxxxxxxxxxxxxxxxxxx<mailto:grassvalley.com@xxxxxxxxxxxxxxxxxxx>] On Behalf Of Gordan Bobic
Sent: Tue 02 June 2020 09:44
Cc: Mailing-List mariadb <maria-discuss@xxxxxxxxxxxxxxxxxxx<mailto:maria-discuss@xxxxxxxxxxxxxxxxxxx>>
Subject: Re: [Maria-discuss] [EXTERNAL] Re: Poor performance compared to MySQL

Can you post EXPLAIN from both? Is it exactly the same?

On Tue, 2 Jun 2020, 09:21 Ling, Andy, <Andy.Ling@xxxxxxxxxxxxxxx<mailto:Andy.Ling@xxxxxxxxxxxxxxx>> wrote:
MariaDB is still significantly slower.


From: Roberto Spadim [mailto:roberto@xxxxxxxxxxxxx<mailto:roberto@xxxxxxxxxxxxx>]
Sent: Mon 01 June 2020 18:33
To: Ling, Andy <Andy.Ling@xxxxxxxxxxxxxxx<mailto:Andy.Ling@xxxxxxxxxxxxxxx>>
Cc: Mailing-List mariadb <maria-discuss@xxxxxxxxxxxxxxxxxxx<mailto:maria-discuss@xxxxxxxxxxxxxxxxxxx>>
Subject: [EXTERNAL] Re: [Maria-discuss] Poor performance compared to MySQL


External Message:Use caution before opening links or attachments
what happen when comparing myisam-myisam?

Em seg., 1 de jun. de 2020 às 12:51, Ling, Andy <Andy.Ling@xxxxxxxxxxxxxxx<mailto:Andy.Ling@xxxxxxxxxxxxxxx>> escreveu:
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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--
Roberto Spadim
SPAEmpresarial - Software ERP/Scada
Eng. Automação e Controle, Eng. Financeira
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