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Shell去除空格和空行的方法

Posted by 夏泽民 Nov 20, 2021

一、去除空行的方法

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route print netstat nr

Posted by 夏泽民 Nov 20, 2021

route print命令可以查看路由表，在dos下面输入route print 就可以了，如何读懂路由表 Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 202.256.257.1 202.256.257.258 1
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
202.256.257.0 255.255.255.0 202.256.257.258 202.256.257.258 1
202.256.257.258 255.255.255.255 127.0.0.1 127.0.0.1 1
202.256.257.255 255.255.255.255 202.256.257.258 202.256.257.258 1
224.0.0.0 224.0.0.0 202.256.257.258 202.256.257.258 1
255.255.255.255 255.255.255.255 202.256.257.258 202.256.257.258 1
Default Gateway: 202.256.257.1

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roaring bitmap

Posted by 夏泽民 Nov 20, 2021

https://www.elastic.co/cn/blog/frame-of-reference-and-roaring-bitmaps

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批量 Kill mysql processlist 进程

Posted by 夏泽民 Nov 20, 2021

https://www.cnblogs.com/bianxj/articles/9605067.html 如果大批量的操作能够通过一系列的select 语句产生，那么理论上就能对这些结果批量处理。

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next-key lock

Posted by 夏泽民 Nov 20, 2021

其实innodb下的记录锁(也叫行锁)，间隙锁，next-key锁统统属于排他锁。 行锁 记录锁其实很好理解，对表中的记录加锁，叫做记录锁，简称行锁。 用间隙锁，在RR级别下，mysql通过间隙锁可以实现锁定number=5之前的间隙，number=5记录之间的间隙，number=5之后的间隙，从而使的新的记录无法被插入进来。

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