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arstercz's blog – Just for writing

How does snoopy log every executed command. January 18, 2018. December 22, 2017. 在 MySQL 中模拟 PostgreSQL 的 sequence 功能. December 7, 2017. November 24, 2017. Read-committed 隔离级别对 MySQL 复制的影响. November 24, 2017. Mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. November 18, 2017. 动态代理 MySQL ***** 端口. October 16, 2017. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On mha switch: 结合 proxysql 和 MH...

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How does snoopy log every executed command. January 18, 2018. December 22, 2017. 在 MySQL 中模拟 PostgreSQL 的 sequence 功能. December 7, 2017. November 24, 2017. Read-committed 隔离级别对 MySQL 复制的影响. November 24, 2017. Mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. November 18, 2017. 动态代理 MySQL ***** 端口. October 16, 2017. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On mha switch: 结合 proxysql 和 MH...

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arstercz's blog – Just for writing | highdb.com Reviews

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How does snoopy log every executed command. January 18, 2018. December 22, 2017. 在 MySQL 中模拟 PostgreSQL 的 sequence 功能. December 7, 2017. November 24, 2017. Read-committed 隔离级别对 MySQL 复制的影响. November 24, 2017. Mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. November 18, 2017. 动态代理 MySQL ***** 端口. October 16, 2017. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On mha switch: 结合 proxysql 和 MH...

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admin – Arster's blog

https://highdb.com/author/admin

My articles and thoughts. Glusterfs trash 功能引起进程崩溃退出 glusterfs 的 trash 功能类似回收站, 用户删除的文件保存到指定的回收目录里, 该功能可以用于数据恢复. 系统环境: Centos 6.4 Glusterfs-3.7.11 错误日志: 每隔几分钟, gluster 进程退出, 相应的报错信息如下: [2016-06-30 15:59:59.281498] I [MSGID: 115036] [server.c:552:server rpc notify] 0-gv0-server: disconnecting connection from gw108.sysop.zongheng.com-22273-2016/06/30-16:00:00:221452-gv0-client-1-0-0 [2016-06-30…. Common utilities for sysadmin/dba. Sys-toolkit Some useful scripts to sysadmins/dbas. read more from: https...

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linux – Arster's blog

https://highdb.com/tag/linux

My articles and thoughts. 1 介绍详见: https:/ github.com/tobert/pcstat pcstat 是 page cache stats 的缩写, 使用该工具可以帮助我们判断一个文件是否被 Linux cache 缓存, 或获取进程在 cache 中的缓存信息. 这在调优数据库或诊断其他 IO 密集型应用的场景下会有所帮助. 该工具的输出有多种格式, 选项包括: Usage of ./pcstat: -bname=false: convert paths to basename…. 全量同步操作: 目标主机新建仓库repos: svnadmin create /export/svn mirror/svn/repo #源主机操作 #svnsync init https:/ svn.dest.com/svn/repo file:/ /data/svn/repo #svnsync sync https:/ svn.dest.com/svn/repo #从版本0开始同步，时间较长. Common utilities for sysadmin/dba.

3

delay – Arster's blog

https://highdb.com/tag/delay

My articles and thoughts. MySQL slave 延迟复制延迟复制是一个很简单的概念，区别于传统的异步复制(接近实时), 比如用户误操作, 删除了重要的表, 延迟复制特性保证了用户有机会从延迟的 slave 中恢复误删除的表. 该特性的问题在于需要保证用户有足够的时间从 slave 阻止误操作复制的发生. 要理解该特性如何实现, 我们先简单回顾下 MySQL replication 如何实现, 见下图: 当 master 有一个更新操作(create, drop, delete, insert, update 等), 该更新操作应用到本地的磁盘并写到 binary log 里，之后更新操作异步(接近于实时)的从master…. Common utilities for sysadmin/dba. Mysql upgrade 升级错误出现 table doesn’t exist 错误整理. 有效的升级 MySQL 库中所有表的字段属性 Arster's blog. On top 10 percona toolkit tools (三).

4

了解 select count(*), count(1) 和 count(field) – Arster's blog

https://highdb.com/了解-select-count-count1-和-countfield

My articles and thoughts. 了解 select count(*), count(1) 和 count(field). 了解 select count(*), count(1) 和 count(field). 我们以 MySQL 中的聚合函数 count 来说明 count(*), count(1) 和 count(field) 三者之间的关系以及背后的原理. Http:/ dev.mysql.com/doc/refman/5.6/en/group-by-functions.html#function count. COUNT(expr) 函数返回 select 语句中表达式 expr 非 null 值的数量, 返回值类型为 bigint. Returns a count of the number of non-NULL values of expr in the rows retrieved by a SELECT statement. The result is a BIGINT value. MyISAM表: MyISAM表的索引组织包含的行数信息, MySQL 只需要返回...

5

MySQL slave 延迟复制 – Arster's blog

https://highdb.com/mysql-slave-延迟复制

My articles and thoughts. 延迟复制是一个很简单的概念，区别于传统的异步复制(接近实时), 比如用户误操作, 删除了重要的表, 延迟复制特性保证了用户有机会从延迟的 slave 中恢复误删除的表. 该特性的问题在于需要保证用户有足够的时间从 slave 阻止误操作复制的发生. 要理解该特性如何实现, 我们先简单回顾下 MySQL replication 如何实现, 见下图:. 当 master 有一个更新操作(create, drop, delete, insert, update 等), 该更新操作应用到本地的磁盘并写到 binary log 里，之后更新操作异步(接近于实时)的从master 的 binary log 复制到 slave 的 relay log, 最后 slave 的 sql thread 线程读取 relay log, 将更新操作应用到 slave 表中. 1 MySQL 5.6 的延迟复制. 不过需要注意的是, 即便在延迟复制的过程中, master 出现问题, 更新操作也不会丢失，因为更新操作已经复制到了 slave 的 relay log 中.

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hao.jobbole.com

MyCli：支持自动补全和语法高亮的 MySQL 客户端 - 资源 - 伯乐在线

http://hao.jobbole.com/mycli-mysql

MyCli 支持自动补全和语法高亮的 MySQL 客户端. 整理，您也想贡献一份力量欢迎加入我们 ». MyCli 是一个 MySQL 命令行工具，支持自动补全和语法高亮。也可用于 MariaDB 和 Percona。如果你是在 OS X 平台，那就用 homebrew. T u@ h: d> ". Mycli local database $ mycli -h localhost -u root app db $ mycli mysql:/ amjith@localhost:3306/django poll. 官方网站 http:/ mycli.net/. 开源地址 https:/ github.com/dbcli/mycli. 进行ab测试的时候由于参数过大导致 mysql服务死掉，systemctl start mysqld 一直启动不了. JavaScript, HTML5, CSS.

zhechen.me

使用Xtrabackup备份远端主机的MySQL实例 – Arster's blog

http://zhechen.me/使用xtrabackup备份远端主机的mysql实例

Percona Xtrabackup是一款用于MySQL备份的开源工具集, 效果类似MySQL Enterprise Backup, 支持在线备份InnoDB而不影响业务使用. 不过我一直觉得Xtrabackup是迄今为止最强悍的MySQL备份工具,没有之一. 备份的原理见: http:/ zhechen.me/how-innobackupex-works/. Http:/ www.percona.com/doc/percona-xtrabackup/2.2/howtos/recipes ibkx stream.html. 通过使用stream,再加上网络的备份方式可以很方便的以tar/gzip方式来备份非本地的机器, 不过在一些场景下, 我们只想备份一台远端机器的非压缩的备份文件, 比如要备份的机器空间不足, 或者保存备份的空间也不足(如果需要在备份主机恢复的话,至少需要2*back size大小的磁盘空间), 这种方式不允许我们将备份保存为tar/gzip格式, 因为不够空间做解压操作. 下面的方式可以达到我们的目标, 不用解压而直接获得解压后的备份文件, 以 nc(netcat) 方式为例说明:.

zhechen.me

MySQL 5.6主从故障处理说明 – Arster's blog

http://zhechen.me/mysql-5-6主从故障处理说明

56增加GTID特性作为主从复制的新协议, 如果开启需要指定 gtid mode 为 on, 如果不开启主从复制采用传统的复制协议, 故障处理同5.1, 5.5. 以下讨论采用gtid协议后的故障处理;. Http:/ dev.mysql.com/doc/refman/5.6/en/replication-gtids-howto.html. 与传统的复制相比, GTID去掉了文件及位置的参数信息, 改用 MASTER AUTO POSITION 替换. Http:/ www.percona.com/blog/2014/05/09/gtids-in-mysql-5-6-new-replication-protocol-new-ways-to-break-replication/. Http:/ dev.mysql.com/doc/refman/5.6/en/replication-gtids-restrictions.html. 2不要使用 create table … select …. 明确gtid purged参数的含义, 等效于传统模式的文件及位置信息; slave出现故障的恢复方式;.

zhechen.me

Perl one line command – 计算 – Arster's blog

http://zhechen.me/perl-one-line-command-计算

Perl one line command – 计算. Perl one line command – 计算. Perl one line command – 计算. 本章使用 Perl 命令行进行一些计算方面的示例说明, 比如查找一行中最大/最小的元素, 统计, 移动和替换单词以及计算日期等. 这章里会用到 -a, -M, -F等命令行参数, 也会讲解一些特殊符及数据结构方面的信息. Perl -lne '(1x$ )! 1 $/ & print "$ is prime number"' file. 先来看看素数的定义: 一个大于1的自然数，除了1和它本身外，不能整除以其他自然数的数称为素数, 否则是合数. 命令行首先将数字转换成一元数据(比如 4 表示为 1111, 5 表示为 11111, 等等), 再用! 排除匹配的正则表达式里的两个条件, 如果都没有匹配, 则该数是素数; 再来看看正则表达式里面的内容, 首先 1? 表示 0 或 1, 满足一个大于 1 的自然数, (11? Echo "1 5 7" perl -MList: Util=sum -alne 'print sum @F'.

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arstercz's blog – Just for writing

How does snoopy log every executed command. January 18, 2018. December 22, 2017. 在 MySQL 中模拟 PostgreSQL 的 sequence 功能. December 7, 2017. November 24, 2017. Read-committed 隔离级别对 MySQL 复制的影响. November 24, 2017. Mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. November 18, 2017. 动态代理 MySQL slave 端口. October 16, 2017. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On 自定义 influxdb 数据结构, 生成 grafana 趋势图. On mha switch: 结合 proxysql 和 MHA 切换 MySQL 主从. On mha switch: 结合 proxysql 和 MH...

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