安装过程：
[root@localhost-centos6 ~]# wget percona.com/get/pt-query-digest
[root@localhost-centos6 ~]# chmod u+x pt-query-digest
[root@localhost-centos6 ~]# mv /root/pt-query-digest /usr/bin/
yum -y install perl-Time-HiRes
http://www.itbulu.com/perl-time-hires.html
原文：http://www.cnblogs.com/norm/p/7723586.html