Question

我有一个Rails应用程序，在服务器启动时会运行很多可能不必要的数据查询。

我想知道如何防止这种情况。有没有办法检测查询运行的原因？

我的应用使用有效管理员。提前谢谢。

$ rails server
=> Booting Thin
=> Rails 3.2.16 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Connecting to database specified by database.yml
  Event Load (112.3ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  EXPLAIN (97.8ms)  EXPLAIN SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
EXPLAIN for: SELECT `events`.* FROM `events`  WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
+----+-------------+--------+------+----------------------------+----------------------------+---------+-------+------+-----------------------------+
| id | select_type | table  | type | possible_keys              | key                        | key_len | ref   | rows | Extra                       |
+----+-------------+--------+------+----------------------------+----------------------------+---------+-------+------+-----------------------------+
|  1 | SIMPLE      | events | ref  | index_events_on_is_enabled | index_events_on_is_enabled | 2       | const |    2 | Using where; Using filesort |
+----+-------------+--------+------+----------------------------+----------------------------+---------+-------+------+-----------------------------+
1 row in set (0.10 sec)

  Team Load (99.6ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.9ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.0ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (101.0ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Language Load (98.1ms)  SELECT `languages`.* FROM `languages` 
  Event Load (105.8ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (98.5ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.8ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.7ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.5ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Event Load (105.8ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (98.3ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (100.1ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.9ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.6ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
  Event Load (199.4ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1
  Team Load (100.2ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.6ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Team Load (100.6ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.5ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Event Load (104.8ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (98.9ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (99.0ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.9ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (100.4ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Event Load (104.8ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (99.6ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.2ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.5ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (98.1ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Language Load (97.9ms)  SELECT `languages`.* FROM `languages` 
  Event Load (106.1ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (98.9ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (97.6ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (102.5ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (126.3ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Event Load (104.9ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (98.3ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (100.4ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (100.5ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (100.1ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Event Load (104.7ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (99.0ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (97.9ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (100.1ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (99.1ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  Event Load (104.7ms)  SELECT `events`.* FROM `events` WHERE `events`.`is_enabled` = 1 ORDER BY start_date_time
  Team Load (98.9ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 365 ORDER BY abbreviation ASC LIMIT 1
  Team Load (99.1ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 382 ORDER BY abbreviation ASC LIMIT 1
  Team Load (99.7ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 2503 ORDER BY abbreviation ASC LIMIT 1
  Team Load (99.1ms)  SELECT `teams`.* FROM `teams` WHERE `teams`.`espn_id` = 160 ORDER BY abbreviation ASC LIMIT 1
  LeaderBoardRange Load (98.8ms)  SELECT `leader_board_ranges`.* FROM `leader_board_ranges` WHERE `leader_board_ranges`.`id` = 1 LIMIT 1
  LeaderBoardRange Load (99.1ms)  SELECT `leader_board_ranges`.* FROM `leader_board_ranges` WHERE `leader_board_ranges`.`id` = 1 LIMIT 1
  EventPollRelationship Load (103.9ms)  SELECT DISTINCT `event_poll_relationships`.* FROM `event_poll_relationships` INNER JOIN `votes` ON `votes`.`event_poll_relationship_id` = `event_poll_relationships`.`id` WHERE (votes.created_at > '2014-01-24 13:38:50')
Thin web server (v1.6.1 codename Death Proof)
Maximum connections set to 1024
Listening on 0.0.0.0:3000, CTRL+C to stop

Answer 1

问题是由活动管理员和一些动态的自定义索引范围引起的。要修复它，您可以禁用或调整这些自定义范围。

例如：

=> Booting Thin
=> Rails 3.2.16 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Connecting to database specified by database.yml
Thin web server (v1.6.1 codename Death Proof)
Maximum connections set to 1024
Listening on 0.0.0.0:3000, CTRL+C to stop

Ruby On Rails在服务器启动后运行一些数据库查询？

1 个答案: