鉴于此查询:
EXPLAIN
SELECT mi.*, i1.sizes as tile_photo_sizes,
i1.filename as tile_photo_filename,
v.title_cached as venue_title,
v.subtitle_cached as venue_subtitle,
v.slug as venue_slug
FROM menuitems mi
INNER JOIN images i1 ON i1.id = mi.tile_photo_id
INNER JOIN menus m ON m.id = mi.menu_id
INNER JOIN venues v ON v.id = m.venue_id
WHERE NOT m.is_deleted AND v.slug="teplo" AND
m.is_published AND v.is_published
ORDER BY mi.number ASC
我看到以下结果:
我尝试为 , 和 中使用的每一列添加单独的索引join
,where
但order by
它仍然使用临时文件。
我不想优化它,但有时这会导致只能由托管服务提供商修复的错误: Can't create/write to file '/mysql-temp/#sql_64e0_0.MYD' (Errcode: 17)
最大的表是 menuitems (6,867),然后是图像 (944)、菜单 (85)、场所 (79)。
UPD:删除 ORDER BY 不使用临时文件