本篇内容主要讲解“分析PostgreSQL DBA数据库的性能指标变化”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“分析PostgreSQL DBA数据库的性能指标变化”吧!
不同的网络环境(延时)对数据库的性能指标有很大的影响,下面用tc工具来模拟增加网络延时来观察数据库的性能指标变化.
安装tc
使用python的封装工具tcconfig,安装命令:
pip3 install tcconfig
性能测试
网络无延时
[pg12@localhost ~]$ pgbench -S -c 10 -h localhost -T 20 test starting vacuum...end. transaction type: <builtin: select only> scaling factor: 1 query mode: simple number of clients: 10 number of threads: 1 duration: 20 s number of transactions actually processed: 298322 latency average = 0.671 ms tps = 14911.921647 (including connections establishing) tps = 14916.752171 (excluding connections establishing)
TPS接近15K
网络延时延时10ms
设置网络延时为10ms
tcset --device lo --delay=10 --overwrite
再次测试
[pg12@localhost ~]$ pgbench -S -c 10 -h 192.168.26.28 -T 20 test starting vacuum...end. transaction type: <builtin: select only> scaling factor: 1 query mode: simple number of clients: 10 number of threads: 1 duration: 20 s number of transactions actually processed: 8459 latency average = 23.655 ms tps = 422.736098 (including connections establishing) tps = 424.325926 (excluding connections establishing)
TPS直接降至400多,差不多只有原来的1/40
网络延时50ms
设置网络延时为50ms
tcset --device lo --delay=50 --overwrite
再次测试
[pg12@localhost ~]$ pgbench -S -c 10 -h 192.168.26.28 -T 20 test starting vacuum...end. transaction type: <builtin: select only> scaling factor: 1 query mode: simple number of clients: 10 number of threads: 1 duration: 20 s number of transactions actually processed: 1650 latency average = 121.406 ms tps = 82.368327 (including connections establishing) tps = 83.671552 (excluding connections establishing)
这一次结果是80多,差不多是最初的1/200
为什么OLTP分布式数据库的TPS的提升是很难的一个事情,其中一个原因是网络延时.
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