慢查询居然记录着我有锁表行为。。但是我并没有进行写的操作。。求解。。
# Query_time: 1.990227 Lock_time: 0.636004 Rows_sent: 1 Rows_examined: 2202
use wwtwosal_expertor;
SELECT COUNT(*) AS total FROM product p LEFT JOIN product_description pd ON (p.product_id = pd.product_id) LEFT JOIN product_to_store p2s ON (p.product_id = p2s.product_id) LEFT JOIN product_special ps ON (p.product_id = ps.product_id) WHERE pd.language_id = '1' AND p.status = '1' AND p.date_available <= NOW() AND p2s.store_id = '0' AND p.product_id IN (SELECT p2c.product_id FROM product_to_category p2c WHERE p2c.category_id = '66')
# Query_time: 1.990227 Lock_time: 0.636004 Rows_sent: 1 Rows_examined: 2202
use wwtwosal_expertor;
SELECT COUNT(*) AS total FROM product p LEFT JOIN product_description pd ON (p.product_id = pd.product_id) LEFT JOIN product_to_store p2s ON (p.product_id = p2s.product_id) LEFT JOIN product_special ps ON (p.product_id = ps.product_id) WHERE pd.language_id = '1' AND p.status = '1' AND p.date_available <= NOW() AND p2s.store_id = '0' AND p.product_id IN (SELECT p2c.product_id FROM product_to_category p2c WHERE p2c.category_id = '66')
否则,把锁请求放在读锁定队列中。
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上面内容是Mysql的参考手册里面内容,实践不多,但是对于最下面的那句:锁请求放在锁队列。
explain看下。
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