【MySQL案例】Mysqlslave中processlisttime值为负数
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slave中执行show processlist时，发现time值为负值。以下是解决办法
mysql-slave1> select user,host, time, state from information_schema.processlist where user='system user';
+-------------+------+-------+------------------------------------------------------------------+
| user | host | time | state |
+-------------+------+-------+------------------------------------------------------------------+
| system user | | -11 | Slave has read all relay log; waiting for the slave I/O thread t |
| system user | | 71875 | Waiting for master to send event |
+-------------+------+-------+------------------------------------------------------------------+
2 rows in set (0.00 sec)
对比了slave和master的时间，发现slave和master时间不同步。
mysql-slave1> select now();
+---------------------+
| now() |
+---------------------+
| 2014-12-13 13:07:20 |
+---------------------+
1 row in set (0.00 sec)
mysql-Master> select now();
+---------------------+
| now() |
+---------------------+
| 2014-12-13 13:07:32 |
+---------------------+
1 row in set (0.00 sec)
mysql-slave1> system date;
Sat Dec 13 13:09:47CST 2014
mysql-Master> system date;
Sat Dec 13 13:09:59 CST 2014
在slave上手工做时间同步后，问题解决。
# /usr/sbin/ntpdate 192.168.1.10; /sbin/hwclock -w
13 Dec 13:12:05 ntpdate[32067]: step time server 192.168.1.10 offset 11.503421 sec
mysql-slave1> select user,host, time, state from information_schema.processlist where user='system user';
+-------------+------+-------+------------------------------------------------------------------+
| user | host | time | state |
+-------------+------+-------+------------------------------------------------------------------+
| system user | | 0 | Slave has read all relay log; waiting for the slave I/O thread t |
| system user | | 72302 | Waiting for master to send event |
+-------------+------+-------+------------------------------------------------------------------+
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