来自php的SQL查询不使用mysql缓存
Mysql服务器设置为缓存:来自php的SQL查询不使用mysql缓存,php,mysql,caching,Php,Mysql,Caching,Mysql服务器设置为缓存: query_cache_size = 1G query_cache_type = 1 当我从phpmyadmin执行查询时,第一次查询耗时2秒,第二次耗时0.0001秒 所以缓存确实可以工作。但是在php脚本中,查询每次持续花费2秒 php version 5.4.14 mysql 5.5.30 脚本: <?php $db = new mysqli("localhost", "user", "pass", "search"); $t = m
query_cache_size = 1G
query_cache_type = 1
当我从phpmyadmin执行查询时,第一次查询耗时2秒,第二次耗时0.0001秒
所以缓存确实可以工作。但是在php脚本中,查询每次持续花费2秒
php version 5.4.14
mysql 5.5.30
脚本:
<?php
$db = new mysqli("localhost", "user", "pass", "search");
$t = microtime(true);
$res = $db-> query("SELECT
i.page_id,
SUM(i.weight) as w
FROM
search.search_index i
INNER JOIN
search.word_full w1
ON w1.word=i.word
INNER JOIN
search.word_full w2
ON w1.word_base=w2.word_base
WHERE
w2.word = 'api'
GROUP BY
i.page_id
ORDER BY NULL");
print($res->num_rows."\n");
print(microtime(true) - $t);
?>
<?php
$link = mysql_connect("localhost", "root", "pass");
mysql_select_db("search");
$t = microtime(true);
$res = $db-> query("SELECT
i.page_id,
SUM(i.weight) as w
FROM
search.search_index i
INNER JOIN
search.word_full w1
ON w1.word=i.word
INNER JOIN
search.word_full w2
ON w1.word_base=w2.word_base
WHERE
w2.word = 'api'
GROUP BY
i.page_id
ORDER BY NULL");
print(mysql_num_rows($res)."\n");
print(microtime(true) - $t);
?>
脚本返回
235899
1.8554458618164
235899
1.8542320728302
Mysql缓存也不工作
表结构:
CREATE TABLE IF NOT EXISTS `search_index` (
`page_id` varchar(32) NOT NULL,
`word` varchar(32) NOT NULL,
`weight` int(11) NOT NULL,
PRIMARY KEY (`word`,`page_id`),
KEY `page_id` (`page_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `word_full` (
`word` varchar(32) NOT NULL,
`word_base` varchar(32) NOT NULL,
PRIMARY KEY (`word`,`word_base`),
UNIQUE KEY `word_base` (`word_base`,`word`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
PHP中的每个调用都是一个新实例,与前一个实例无关。除非你明确声明
看看查询缓存:我在这里假设
word\u full.word\u base
和word\u full.word
都是VARCHAR列。如果不是这样,请提供完整的表结构,包括搜索索引和单词完整表的键
我会的
SELECT
i.page_id,
SUM(i.weight) as w
FROM search.search_index i
INNER JOIN search.word_full w1
ON w1.wordID = i.wordID
INNER JOIN search.word_full w2
ON w1.wordID_base = w2.wordID_base
AND w2.word = 'api'
GROUP BY i.page_id
ORDER BY NULL
phpmyadmin修改查询
SELECT
i.page_id,
SUM(i.weight) as w
FROM
search.search_index i
INNER JOIN
search.word_full w1
ON w1.word=i.word
INNER JOIN
search.word_full w2
ON w1.word_base=w2.word_base
WHERE
w2.word = 'api'
GROUP BY
i.page_id
ORDER BY NULL
到
在查询结束处添加限制0,30
和查询大小>查询\u缓存\u限制
我将查询缓存限制提高到10米 我假设他可能是指mysql内部查询缓存,我昨天测试了mysqlnd qc。不太管用。phpmyadmin不工作吗?mysql在查询中也使用了常量?查询工作正常。如果我在控制台中使用phpmyadmin和Mysql,那么就使用Mysql。正如我在回答中提到的,如果您能够为我们提供包括键在内的表结构,那么它将有所帮助。很可能您的列类型或键不合适。
SELECT
i.page_id,
SUM(i.weight) as w
FROM
search.search_index i
INNER JOIN
search.word_full w1
ON w1.word=i.word
INNER JOIN
search.word_full w2
ON w1.word_base=w2.word_base
WHERE
w2.word = 'api'
GROUP BY
i.page_id
ORDER BY NULL
SELECT
i.page_id,
SUM(i.weight) as w
FROM
search.search_index i
INNER JOIN
search.word_full w1
ON w1.word=i.word
INNER JOIN
search.word_full w2
ON w1.word_base=w2.word_base
WHERE
w2.word = 'api'
GROUP BY
i.page_id
ORDER BY NULL
LIMIT 0, 30