我有一个基于 MySQL 视图的记录集,用于返回搜索结果,但速度非常慢(始终为 21 秒!)。在同一环境中进行类似的搜索需要不到一秒钟的时间。
我担心是视图会减慢速度,因为我有四个左连接和一个子查询,以便在搜索中提供相关数据。
使用视图时是否有任何关于加快查询速度的一般指导?我已经研究过索引,但似乎 MySQL 在视图中是不允许的。
在此先感谢您的任何建议。
创建我的视图的代码:
CREATE VIEW vproducts2 AS
SELECT products2.productid, products2.active, products2.brandid,
products2.createddate, products2.description, products2.inventorynum,
products2.onhold, products2.price, products2.refmodnum, products2.retail,
products2.sefurl, products2.series, products2.sold,
`producttype`.`type` AS type, categories.category AS category,
`watchbrands`.`brand` AS brand, productfeatures.productfeaturevalue AS size,
(SELECT productimages.image
FROM productimages
WHERE productimages.productid = products2.productid
LIMIT 1
) AS pimage
FROM products2
LEFT JOIN producttype ON producttype.typeid = products2.typeid
LEFT JOIN categories ON categories.categoryid = products2.categoryid
LEFT JOIN watchbrands ON watchbrands.brandid = products2.brandid
LEFT JOIN productfeatures ON productfeatures.productid = products2.productid
AND productfeatures.featureid = 1