mysql - 定制的客户网格导致 MySQL 表扫描和文件排序也就是性能下降

Question

Magento 企业。1.10.1.1。客户和地址的数据集是半大型 (125k+) CSR 通常在此网格上（有时一次有 25+ 个并发用户）。

这是在客户Grid.php Block文件中生成集合的代码片段。没有什么花哨或不寻常的，只是主要为集合添加属性。

$collection = Mage::getResourceModel('customer/customer_collection')
    ->addNameToSelect()
    ->addAttributeToSelect('email')
    ->addAttributeToSelect('group_id')
    ->addAttributeToSelect('prod_codes')
    ->addAttributeToSelect('last_called_date')
    ->addAttributeToSelect('time_zone')
    ->addAttributeToSelect('salesrep')
    ->addAttributeToSelect('do_not_call')
    ->addAttributeToSelect('club_member')
    ->addAttributeToSelect('call_back_date')
    ->addAttributeToSelect('marketing_code_outcome')
    ->joinAttribute('billing_postcode', 'customer_address/postcode', 'default_billing', null, 'left')
    ->joinAttribute('billing_city', 'customer_address/city', 'default_billing', null, 'left')
    ->joinAttribute('billing_telephone', 'customer_address/telephone', 'default_billing', null, 'left')
    ->joinAttribute('billing_region', 'customer_address/region', 'default_billing', null, 'left');

$this->setCollection($collection);

生成此查询，该查询在客户网格中行为不端导致加载时间过长：

SELECT 
    e . *,
    _table_prefix.value AS prefix,
    _table_firstname.value AS firstname,
    _table_middlename.value AS middlename,
    _table_lastname.value AS lastname,
    _table_suffix.value AS suffix,
    CONCAT(IF(_table_prefix.value IS NOT NULL AND _table_prefix.value != '',
                CONCAT(TRIM(_table_prefix.value), ' '),
                ''),
            TRIM(_table_firstname.value),
            IF(_table_middlename.value IS NOT NULL AND _table_middlename.value != '',
                CONCAT(' ', TRIM(_table_middlename.value)),
                ''),
            ' ',
            TRIM(_table_lastname.value),
            IF(_table_suffix.value IS NOT NULL AND _table_suffix.value != '',
                CONCAT(' ', TRIM(_table_suffix.value)),
                '')) AS name,
    _table_default_billing.value AS default_billing,
    _table_billing_postcode.value AS billing_postcode,
    _table_billing_city.value AS billing_city,
    _table_billing_telephone.value AS billing_telephone,
    _table_billing_region.value AS billing_region
FROM
    customer_entity AS e
        LEFT JOIN
    customer_entity_varchar AS _table_prefix ON (_table_prefix.entity_id = e.entity_id) AND (_table_prefix.attribute_id = '4')
        LEFT JOIN
    customer_entity_varchar AS _table_firstname ON (_table_firstname.entity_id = e.entity_id) AND (_table_firstname.attribute_id = '5')
        LEFT JOIN
    customer_entity_varchar AS _table_middlename ON (_table_middlename.entity_id = e.entity_id) AND (_table_middlename.attribute_id = '6')
        LEFT JOIN
    customer_entity_varchar AS _table_lastname ON (_table_lastname.entity_id = e.entity_id) AND (_table_lastname.attribute_id = '7')
        LEFT JOIN
    customer_entity_varchar AS _table_suffix ON (_table_suffix.entity_id = e.entity_id) AND (_table_suffix.attribute_id = '8')
        LEFT JOIN
    customer_entity_int AS _table_default_billing ON (_table_default_billing.entity_id = e.entity_id) AND (_table_default_billing.attribute_id = '13')
        LEFT JOIN
    customer_address_entity_varchar AS _table_billing_postcode ON (_table_billing_postcode.entity_id = _table_default_billing.value) AND (_table_billing_postcode.attribute_id = '29')
        LEFT JOIN
    customer_address_entity_varchar AS _table_billing_city ON (_table_billing_city.entity_id = _table_default_billing.value) AND (_table_billing_city.attribute_id = '25')
        LEFT JOIN
    customer_address_entity_varchar AS _table_billing_telephone ON (_table_billing_telephone.entity_id = _table_default_billing.value) AND (_table_billing_telephone.attribute_id = '30')
        LEFT JOIN
    customer_address_entity_varchar AS _table_billing_region ON (_table_billing_region.entity_id = _table_default_billing.value) AND (_table_billing_region.attribute_id = '27')
WHERE
    (e.entity_type_id = '1')
ORDER BY CONCAT(IF(_table_prefix.value IS NOT NULL AND _table_prefix.value != '',
            CONCAT(TRIM(_table_prefix.value), ' '),
            ''),
        TRIM(_table_firstname.value),
        IF(_table_middlename.value IS NOT NULL AND _table_middlename.value != '',
            CONCAT(' ', TRIM(_table_middlename.value)),
            ''),
        ' ',
        TRIM(_table_lastname.value),
        IF(_table_suffix.value IS NOT NULL AND _table_suffix.value != '',
            CONCAT(' ', TRIM(_table_suffix.value)),
            '')) desc
LIMIT 20 OFFSET 60

查询显示EXPLAIN，注意表 e 上的 Extra，使用临时和使用文件排序：

*************************** 1. row ***************************
           id: 1
  select_type: SIMPLE
        table: e
         type: ref
possible_keys: IDX_ENTITY_TYPE
          key: IDX_ENTITY_TYPE
      key_len: 2
          ref: const
         rows: 55556
        Extra: Using temporary; Using filesort
*************************** 2. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_prefix
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_VARCHAR_ATTRIBUTE,FK_CUSTOMER_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod.e.entity_id,const
         rows: 1
        Extra:
*************************** 3. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_firstname
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_VARCHAR_ATTRIBUTE,FK_CUSTOMER_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod.e.entity_id,const
         rows: 1
        Extra:
*************************** 4. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_middlename
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_VARCHAR_ATTRIBUTE,FK_CUSTOMER_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod.e.entity_id,const
         rows: 1
        Extra:
*************************** 5. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_lastname
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_VARCHAR_ATTRIBUTE,FK_CUSTOMER_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod.e.entity_id,const
         rows: 1
        Extra:
*************************** 6. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_suffix
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_VARCHAR_ATTRIBUTE,FK_CUSTOMER_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod.e.entity_id,const
         rows: 1
        Extra:
*************************** 7. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_default_billing
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_INT_ATTRIBUTE,FK_CUSTOMER_INT_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod.e.entity_id,const
         rows: 1
        Extra:
*************************** 8. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_billing_postcode
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_ADDRESS_VARCHAR_ATTRIBUTE,FK_CUSTOMER_ADDRESS_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod._table_default_billing.value,const
         rows: 1
        Extra:
*************************** 9. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_billing_city
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_ADDRESS_VARCHAR_ATTRIBUTE,FK_CUSTOMER_ADDRESS_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod._table_default_billing.value,const
         rows: 1
        Extra:
*************************** 10. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_billing_telephone
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_ADDRESS_VARCHAR_ATTRIBUTE,FK_CUSTOMER_ADDRESS_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod._table_default_billing.value,const
         rows: 1
        Extra:
*************************** 11. row ***************************
           id: 1
  select_type: SIMPLE
        table: _table_billing_region
         type: eq_ref
possible_keys: IDX_ATTRIBUTE_VALUE,FK_CUSTOMER_ADDRESS_VARCHAR_ATTRIBUTE,FK_CUSTOMER_ADDRESS_VARCHAR_ENTITY,IDX_VALUE
          key: IDX_ATTRIBUTE_VALUE
      key_len: 6
          ref: prod._table_default_billing.value,const
         rows: 1
        Extra:
11 rows in set (0.00 sec)

除了 Magento 本身为 1.10.1 提供的默认索引外，没有修改任何索引，请参见此处的 1.5.1 (CE) 结构：http: //www.magereverse.com/index/magento-sql-structure/version/1- 5-1-0

这是称为 AS e 的别名表。在扫描中：

CREATE TABLE `customer_entity` (
    `entity_id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
    `entity_type_id` SMALLINT(8) UNSIGNED NOT NULL DEFAULT '0',
    `attribute_set_id` SMALLINT(5) UNSIGNED NOT NULL DEFAULT '0',
    `website_id` SMALLINT(5) UNSIGNED NULL DEFAULT NULL,
    `email` VARCHAR(255) NOT NULL DEFAULT '',
    `group_id` SMALLINT(3) UNSIGNED NOT NULL DEFAULT '0',
    `increment_id` VARCHAR(50) NOT NULL DEFAULT '',
    `store_id` SMALLINT(5) UNSIGNED NULL DEFAULT '0',
    `created_at` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
    `updated_at` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',
    `is_active` TINYINT(1) UNSIGNED NOT NULL DEFAULT '1',
    PRIMARY KEY (`entity_id`),
    INDEX `FK_CUSTOMER_ENTITY_STORE` (`store_id`),
    INDEX `IDX_ENTITY_TYPE` (`entity_type_id`),
    INDEX `IDX_AUTH` (`email`, `website_id`),
    INDEX `FK_CUSTOMER_WEBSITE` (`website_id`),
    CONSTRAINT `FK_CUSTOMER_ENTITY_STORE` FOREIGN KEY (`store_id`) REFERENCES `core_store` (`store_id`) ON UPDATE CASCADE ON DELETE SET NULL,
    CONSTRAINT `FK_CUSTOMER_WEBSITE` FOREIGN KEY (`website_id`) REFERENCES `core_website` (`website_id`) ON UPDATE CASCADE ON DELETE SET NULL
)

所以问题是我怎样才能让这个查询更好地执行而不导致创建和扫描临时表。

我不确定我可以索引什么来提高查询性能，我不想过多地研究修改 Magento 的 ORM。

score 1 · Accepted Answer

我不熟悉 Magento Enterprise，但从 MySQL 的角度来看，我会寻找一种方法来替换它

ORDER BY CONCAT(IF(_table_prefix.value IS NOT NULL AND _table_prefix.value != '',
            CONCAT(TRIM(_table_prefix.value), ' '),
            ''),
        TRIM(_table_firstname.value),
        IF(_table_middlename.value IS NOT NULL AND _table_middlename.value != '',
            CONCAT(' ', TRIM(_table_middlename.value)),
            ''),
        ' ',
        TRIM(_table_lastname.value),
        IF(_table_suffix.value IS NOT NULL AND _table_suffix.value != '',
            CONCAT(' ', TRIM(_table_suffix.value)),
            '')) desc

具有预先计算的值name。这将消除双重计算。

score 0 · Accepted Answer

我不再记得可怕的 Magento 表结构了，但如果可能的话，你可以加快这样的事情：

仅选择您需要的每个条目的主 ID（仅执行行消除和排序所需的连接）。然后，只使用以前的 ID 进行大连接和值选择。在这种情况下，您似乎可以消除所有地址连接，这应该是一个很大的胜利。

有更少的原始数据来排序，然后在大连接中更少，你将有相当大的速度。在其他系统中，我已经进行了 >100 秒的查询，像这样在 <3 中运行，祝你好运！

score 0 · Accepted Answer

不确定您的情况是否属实，但是...

如果您使用_table_prefix.attribute_id链接表并且它是整数，则删除引号，否则 mysql 将在比较之前将整数字段中的所有值转换为字符串。这将导致文件排序。

AND (_table_prefix.attribute_id = '4')

……会变成……

AND (_table_prefix.attribute_id = 4)

mysql - 定制的客户网格导致 MySQL 表扫描和文件排序也就是性能下降

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