mysql数据库服务器正在使用超过85%的内存，即使只有一个或两个连接运行select语句
内存利用率： [root@server1 ~]# free -m total used free shared buffers cached Mem: 80587 71466 9120 0 273 816 -/+ buffers/cache: 70376 10210 Swap: 5119 3873 1246 ###顶部 Tasks: 251 total, 1 running, 250 sleeping, 0 stopped, 0 zombie Cpu(s): 14.1%us, 2.2%sy, 0.0%ni, 83.7%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 82521148k total, 73200520k used, 9320628k free, 280632k buffers Swap: 5242872k total, 3966636k used, 1276236k free, 851116k cached ```
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
15224 mysql 20 0 113g 67g 5480 S 95.7 85.5 14490:38 mysqld
5053 root 20 0 4655m 132m 1756 S 0.7 0.2 238:44.07 java
2400 root 20 0 942m 7084 1788 S 0.3 0.0 63:54.37 dad
1 root 20 0 28052 552 332 S 0.0 0.0 0:10.99 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.27 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:17.17 migration/0
4 root 20 0 0 0 0 S 0.0 0.0 9:36.25 ksoftirqd/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
6 root RT 0 0 0 0 S 0.0 0.0 0:08.29 watchdog/0
7 root RT 0 0 0 0 S 0.0 0.0 0:17.39 migration/1
8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
9 root 20 0 0 0 0 S 0.0 0.0 6:27.07 ksoftirqd/1
10 root RT 0 0 0 0 S 0.0 0.0 0:07.06 watchdog/1
11 root RT 0 0 0 0 S 0.0 0.0 0:23.34 migration/2

Processlist :

mysql> show full processlist ;
+---------+-----------+------------------+--------+---------+------+--------------+-------------------------------------------------------------------------------------------------------------------------+
| Id | User | Host | db | Command | Time | State | Info |
+---------+-----------+------------------+--------+---------+------+--------------+-------------------------------------------------------------------------------------------------------------------------+
| 3404546 | sampledb | 10.4.86.65:34777 | lordm | Sleep | 420 | | NULL |
| 3411236 | root | localhost | NULL | Query | 0 | init | show full processlist | |
| 3411356 | sampledb | 10.4.86.65:43134 | lordm | Sleep | 0 | | NULL |
| 3411357 | sampledb | 10.4.86.65:43135 | lordm | Sleep | 0 | | NULL |
| 3411358 | sampledb | 10.4.86.65:43136 | lordm | Sleep | 0 | | NULL |
| 3411359 | sampledb | 10.4.86.65:43137 | lordm | Query | 0 | Sending data | SELECT

'REJECT'
, r.src_id
, r.src_id
FROM sample_processd r
WHERE last_machine_processed = 0
GROUP BY r.src_id |
+---------+-----------+------------------+--------+---------+------+--------------+-------------------------------------------------------------------------------------------------------------------------+

### innodb缓冲池

mysql> show variables like '%innodb_buffer_pool%';
+-------------------------------------+----------------+
| Variable_name | Value |
+-------------------------------------+----------------+
| innodb_buffer_pool_dump_at_shutdown | ON |
| innodb_buffer_pool_dump_now | OFF |
| innodb_buffer_pool_filename | ib_buffer_pool |
| innodb_buffer_pool_instances | 47 |
| innodb_buffer_pool_load_abort | OFF |
| innodb_buffer_pool_load_at_startup | ON |
| innodb_buffer_pool_load_now | OFF |
| innodb_buffer_pool_size | 50465865728 |
+-------------------------------------+----------------+
8 rows in set (0.00 sec)

有人能告诉我mysql内存消耗的可能原因和修复方法吗？