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Martin's questions

Martin Hope
Martin
Asked: 2015-10-17 10:28:27 +0800 CST
  • 26

Eu estava pesquisando, autodidata e procurando soluções por horas, mas sem sorte. Encontrei algumas perguntas semelhantes aqui, mas não este caso.

Minhas mesas:

  • pessoas (~ 10 milhões de linhas)
  • atributos (local, idade,...)
  • links (M:M) entre pessoas e atributos (~40 milhões de linhas)

Despejo completo ~ 280 MB

Situação: Procuro selecionar todos os ids de pessoa ( person_id) de algumas localidades ( location.attribute_value BETWEEN 3000 AND 7000), ser de algum gênero ( gender.attribute_value = 1), ter nascido em alguns anos ( bornyear.attribute_value BETWEEN 1980 AND 2000) e ter alguma cor dos olhos ( eyecolor.attribute_value IN (2,3)).

Esta é a minha consulta que leva de 3 a 4 minutos. e gostaria de otimizar:

SELECT person_id
FROM person
    LEFT JOIN attribute location ON location.attribute_type_id = 1 AND location.person_id = person.person_id
    LEFT JOIN attribute gender ON gender.attribute_type_id = 2 AND gender.person_id = person.person_id
    LEFT JOIN attribute bornyear ON bornyear.attribute_type_id = 3 AND bornyear.person_id = person.person_id
    LEFT JOIN attribute eyecolor ON eyecolor.attribute_type_id = 4 AND eyecolor.person_id = person.person_id
WHERE 1
    AND location.attribute_value BETWEEN 3000 AND 7000
    AND gender.attribute_value = 1
    AND bornyear.attribute_value BETWEEN 1980 AND 2000
    AND eyecolor.attribute_value IN (2,3)
LIMIT 100000;

Resultado:

+-----------+
| person_id |
+-----------+
|       233 |
|       605 |
|       ... |
|   8702599 |
|   8703617 |
+-----------+
100000 rows in set (3 min 42.77 sec)

Explique estendida:

+----+-------------+----------+--------+---------------------------------------------+-----------------+---------+--------------------------+---------+----------+--------------------------+
| id | select_type | table    | type   | possible_keys                               | key             | key_len | ref                      | rows    | filtered | Extra                    |
+----+-------------+----------+--------+---------------------------------------------+-----------------+---------+--------------------------+---------+----------+--------------------------+
|  1 | SIMPLE      | bornyear | range  | attribute_type_id,attribute_value,person_id | attribute_value | 5       | NULL                     | 1265229 |   100.00 | Using where              |
|  1 | SIMPLE      | location | ref    | attribute_type_id,attribute_value,person_id | person_id       | 5       | test1.bornyear.person_id |       4 |   100.00 | Using where              |
|  1 | SIMPLE      | eyecolor | ref    | attribute_type_id,attribute_value,person_id | person_id       | 5       | test1.bornyear.person_id |       4 |   100.00 | Using where              |
|  1 | SIMPLE      | gender   | ref    | attribute_type_id,attribute_value,person_id | person_id       | 5       | test1.eyecolor.person_id |       4 |   100.00 | Using where              |
|  1 | SIMPLE      | person   | eq_ref | PRIMARY                                     | PRIMARY         | 4       | test1.location.person_id |       1 |   100.00 | Using where; Using index |
+----+-------------+----------+--------+---------------------------------------------+-----------------+---------+--------------------------+---------+----------+--------------------------+
5 rows in set, 1 warning (0.02 sec)

Perfil:

+------------------------------+-----------+
| Status                       | Duration  |
+------------------------------+-----------+
| Sending data                 |  3.069452 |
| Waiting for query cache lock |  0.000017 |
| Sending data                 |  2.968915 |
| Waiting for query cache lock |  0.000019 |
| Sending data                 |  3.042468 |
| Waiting for query cache lock |  0.000043 |
| Sending data                 |  3.264984 |
| Waiting for query cache lock |  0.000017 |
| Sending data                 |  2.823919 |
| Waiting for query cache lock |  0.000038 |
| Sending data                 |  2.863903 |
| Waiting for query cache lock |  0.000014 |
| Sending data                 |  2.971079 |
| Waiting for query cache lock |  0.000020 |
| Sending data                 |  3.053197 |
| Waiting for query cache lock |  0.000087 |
| Sending data                 |  3.099053 |
| Waiting for query cache lock |  0.000035 |
| Sending data                 |  3.064186 |
| Waiting for query cache lock |  0.000017 |
| Sending data                 |  2.939404 |
| Waiting for query cache lock |  0.000018 |
| Sending data                 |  3.440288 |
| Waiting for query cache lock |  0.000086 |
| Sending data                 |  3.115798 |
| Waiting for query cache lock |  0.000068 |
| Sending data                 |  3.075427 |
| Waiting for query cache lock |  0.000072 |
| Sending data                 |  3.658319 |
| Waiting for query cache lock |  0.000061 |
| Sending data                 |  3.335427 |
| Waiting for query cache lock |  0.000049 |
| Sending data                 |  3.319430 |
| Waiting for query cache lock |  0.000061 |
| Sending data                 |  3.496563 |
| Waiting for query cache lock |  0.000029 |
| Sending data                 |  3.017041 |
| Waiting for query cache lock |  0.000032 |
| Sending data                 |  3.132841 |
| Waiting for query cache lock |  0.000050 |
| Sending data                 |  2.901310 |
| Waiting for query cache lock |  0.000016 |
| Sending data                 |  3.107269 |
| Waiting for query cache lock |  0.000062 |
| Sending data                 |  2.937373 |
| Waiting for query cache lock |  0.000016 |
| Sending data                 |  3.097082 |
| Waiting for query cache lock |  0.000261 |
| Sending data                 |  3.026108 |
| Waiting for query cache lock |  0.000026 |
| Sending data                 |  3.089760 |
| Waiting for query cache lock |  0.000041 |
| Sending data                 |  3.012763 |
| Waiting for query cache lock |  0.000021 |
| Sending data                 |  3.069694 |
| Waiting for query cache lock |  0.000046 |
| Sending data                 |  3.591908 |
| Waiting for query cache lock |  0.000060 |
| Sending data                 |  3.526693 |
| Waiting for query cache lock |  0.000076 |
| Sending data                 |  3.772659 |
| Waiting for query cache lock |  0.000069 |
| Sending data                 |  3.346089 |
| Waiting for query cache lock |  0.000245 |
| Sending data                 |  3.300460 |
| Waiting for query cache lock |  0.000019 |
| Sending data                 |  3.135361 |
| Waiting for query cache lock |  0.000021 |
| Sending data                 |  2.909447 |
| Waiting for query cache lock |  0.000039 |
| Sending data                 |  3.337561 |
| Waiting for query cache lock |  0.000140 |
| Sending data                 |  3.138180 |
| Waiting for query cache lock |  0.000090 |
| Sending data                 |  3.060687 |
| Waiting for query cache lock |  0.000085 |
| Sending data                 |  2.938677 |
| Waiting for query cache lock |  0.000041 |
| Sending data                 |  2.977974 |
| Waiting for query cache lock |  0.000872 |
| Sending data                 |  2.918640 |
| Waiting for query cache lock |  0.000036 |
| Sending data                 |  2.975842 |
| Waiting for query cache lock |  0.000051 |
| Sending data                 |  2.918988 |
| Waiting for query cache lock |  0.000021 |
| Sending data                 |  2.943810 |
| Waiting for query cache lock |  0.000061 |
| Sending data                 |  3.330211 |
| Waiting for query cache lock |  0.000025 |
| Sending data                 |  3.411236 |
| Waiting for query cache lock |  0.000023 |
| Sending data                 | 23.339035 |
| end                          |  0.000807 |
| query end                    |  0.000023 |
| closing tables               |  0.000325 |
| freeing items                |  0.001217 |
| logging slow query           |  0.000007 |
| logging slow query           |  0.000011 |
| cleaning up                  |  0.000104 |
+------------------------------+-----------+
100 rows in set (0.00 sec)

Estruturas de tabelas:

CREATE TABLE `attribute` (
  `attribute_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `attribute_type_id` int(11) unsigned DEFAULT NULL,
  `attribute_value` int(6) DEFAULT NULL,
  `person_id` int(11) unsigned DEFAULT NULL,
  PRIMARY KEY (`attribute_id`),
  KEY `attribute_type_id` (`attribute_type_id`),
  KEY `attribute_value` (`attribute_value`),
  KEY `person_id` (`person_id`)
) ENGINE=MyISAM AUTO_INCREMENT=40000001 DEFAULT CHARSET=utf8;

CREATE TABLE `person` (
  `person_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `person_name` text CHARACTER SET latin1,
  PRIMARY KEY (`person_id`)
) ENGINE=MyISAM AUTO_INCREMENT=20000001 DEFAULT CHARSET=utf8;

A consulta foi realizada no servidor virtual da DigitalOcean com SSD e 1GB de RAM.

Suponho que pode haver problema com o design do banco de dados. Você tem alguma sugestão para projetar melhor esta situação, por favor? Ou apenas para ajustar o select acima?

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