//表结构
CREATE TABLE IF NOT EXISTS `radacct` (
`RadAcctId` bigint(21) NOT NULL AUTO_INCREMENT,
`UserName` varchar(64) NOT NULL DEFAULT '',
`AcctSessionTime` int(12) DEFAULT NULL,
`AcctInputOctets` bigint(12) DEFAULT NULL,
`AcctOutputOctets` bigint(12) DEFAULT NULL,
...
......
PRIMARY KEY (`RadAcctId`),
KEY `UserName` (`UserName`),
KEY `AcctSessionTime` (`AcctSessionTime`),
KEY `AcctInputOctets` (`AcctInputOctets`),
KEY `AcctOutputOctets` (`AcctOutputOctets`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=456017;
$sql = 'SELECT UserName, count(*) AS numOfSession, sum(AcctSessionTime) AS Time, sum(AcctInputOctets) AS Upload, sum(AcctOutputOctets) AS Download, sum(AcctInputOctets+AcctOutputOctets) AS Bandwidth FROM radacct GROUP BY UserName';
mysql> explain SELECT UserName, count(*) AS numOfSession, sum( AcctSessionTime ) AS Time, sum( AcctInputOctets ) AS Upload, sum( AcctOutputOctets ) AS Download, sum( AcctInputOctets + AcctOutputOctets ) AS Bandwidth FROM radacct GROUP BY UserName;
+----+-------------+---------+------+---------------+------+---------+------+--------+---------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+---------+------+---------------+------+---------+------+--------+---------------------------------+
| 1 | SIMPLE | radacct | ALL | NULL | NULL | NULL | NULL | 456010 | Using temporary; Using filesort |
+----+-------------+---------+------+---------------+------+---------+------+--------+---------------------------------+数据量大概45w左右 在sum的字段上加上索引也无法提高查询效率 加上分页什么的就更慢了怎么优化比较好啊 先拜谢了
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