執行 pt-query-digest slow.log > digest.log 命令時報錯：
[root@CentOS-CLI-MySql data]# pt-query-digest slow.log > digest.log
Can't locate Digest/MD5.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /usr/local/toolkit/bin/pt-query-digest line 2470.
BEGIN failed--compilation aborted at /usr/local/toolkit/bin/pt-query-digest line 2470.
[root@CentOS-CLI-MySql data]#
原因是：缺少perl-Digest-MD5包， 安裝perl-Digest-MD5即可解決。
[root@CentOS-CLI-MySql data]# yum -y install perl-Digest-MD5