我一直在优化我的 MySQL 服务器，在调整了一些查询之后，我最终在 pt-query-digest 输出顶部得到了 COMMIT 项，如下面的摘录所示：
# 322s user time, 770ms system time, 71.75M rss, 223.13M vsz
# Current date: Sat Oct 1 11:12:58 2016
# Hostname: XXXX
# Files: /home/tools/Slow10.log
# Overall: 1.08M total, 1.47k unique, 61.74 QPS, 0.17x concurrency _______
# Time range: 2016-10-01 06:15:09 to 11:06:35
# Attribute total min max avg 95% stddev median
# ============ ======= ======= ======= ======= ======= ======= =======
# Exec time 2913s 1us 14s 3ms 15ms 27ms 194us
# Lock …