mysql 排序 /tmp被撑爆

我:
SELECT ai.`code`, c.mobilePhone
			,co.`name`,cc.createdTime
FROM
ClientCoupon AS cc
INNER JOIN ActivityInfo AS ai ON ai.sn = cc.activitySn
INNER JOIN Client AS c ON cc.clientSn = c.sn
INNER JOIN Coupon AS co ON co.sn = cc.couponSn ,
ClientCoupon
WHERE 1 = 1
			AND  co.sn not in (3, 5, 6)
			AND  ai.code in ('10000006', '10000007', '10000008', '10000001', '10000002')
		AND ai.partStartTime <= '2015-12-18 16:42:00'
		AND ai.partEndTime >=  '2015-12-18 16:42:00'
ORDER BY co.amount DESC, cc.createdTime DESC
 limit 0, 10000;


mysql 排序导致内存使用高,且磁盘不断增大;

jrhdpt02:/root# free -m
             total       used       free     shared    buffers     cached
Mem:         15948      11981       3966          0        304       7918
-/+ buffers/cache:       3758      12189
Swap:         4095          0       4095

jrhdpt02:/root# free -m
             total       used       free     shared    buffers     cached
Mem:         15948      11981       3966          0        304       7918
-/+ buffers/cache:       3758      12189
Swap:         4095          0       4095

为什么呢？

jrhdpt02:/tmp# ls -ltrh
total 1.7G
srwxrwxrwx 1 root   root      0 Mar 19  2015 qtsingleapp-aegiss-a5d2-0
srwxr-x--- 1 root   root      0 Mar 19  2015 Aegis-<Guid(5A2C30A2-A87D-490A-9281-6765EDAD7CBA)>
srwxr-x--- 1 root   root      0 Mar 19  2015 qtsingleapp-aegisG-46d2-0
-rw-rw-r-- 1 zabbix zabbix 5.4K Dec 13 04:04 zabbix_agentd.log
-rw-rw---- 1 mysql  mysql  1.0K Dec 19 09:38 #sql_3d9c_0.MYI
-rw-rw---- 1 mysql  mysql  1.7G Dec 19 09:39 #sql_3d9c_0.MYD

mysql> show variables like '%tmp%';
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| default_tmp_storage_engine | InnoDB   |
| max_tmp_tables             | 32       |
| slave_load_tmpdir          | /tmp     |
| tmp_table_size             | 16777216 |
| tmpdir                     | /tmp     |
+----------------------------+----------+
5 rows in set (0.01 sec)


tmpdir  系统变量执行一个专用的系统 有大的空闲空间,变量值可以列出几个路径以循环的方式。


排序前:
jrhdpt02:/# ls -ltr | grep -v data | awk '{print $NF}' | while read A; do du -sh $A; done
du: cannot access `4194416': No such file or directory
4.0K	srv
4.0K	mnt
4.0K	media
16K	lost+found
4.0K	selinux
2.0G	usr
653M	var
24M	boot
4.1G	swapfile
14M	opt
2.1G	software
180K	dev
du: cannot access `proc/32283/task/32283/fd/4': No such file or directory
du: cannot access `proc/32283/task/32283/fdinfo/4': No such file or directory
du: cannot access `proc/32283/fd/4': No such file or directory
du: cannot access `proc/32283/fdinfo/4': No such file or directory
0	proc
0	sys
20K	home
148M	lib
22M	lib64
15M	sbin
7.6M	bin
27M	etc
352M	root
20K	tmp
You have new mail in /var/spool/mail/root

排序后:
jrhdpt02:/# ls -ltr | grep -v data | awk '{print $NF}' | while read A; do du -sh $A; done
du: cannot access `4194416': No such file or directory
4.0K	srv
4.0K	mnt
4.0K	media
16K	lost+found
4.0K	selinux
2.0G	usr
653M	var
24M	boot
4.1G	swapfile
14M	opt
2.1G	software
180K	dev
du: cannot access `proc/31588/task/31588/fd/4': No such file or directory
du: cannot access `proc/31588/task/31588/fdinfo/4': No such file or directory
du: cannot access `proc/31588/fd/4': No such file or directory
du: cannot access `proc/31588/fdinfo/4': No such file or directory
0	proc
0	sys
20K	home
148M	lib
22M	lib64
15M	sbin
7.6M	bin
27M	etc
352M	root
1.7G	tmp