2018-07-09T14:28:56.853600Z 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 4724ms. The settings might not be optimal. (flushed=1037, during the time.) innodb_buffer_pool 缓存需要加大…

今天同事负责的数据库从库出现从库延迟增大,MySQL日志InnoDB: page_cleaner: 1000ms intended loop took 17915ms. 了解原因,keepalived+MySQL主主复制架构,MySQL5.7版本,其中keepalived切换到备库后,在切换回来导致从库延迟增大,MySQL日志出现InnoDB: page_cleaner: 1000ms intended loop took 17915ms. 查看服务器top,发现CPU出现大量wait占用 同时…

声明:本文由我的同事@fiona514编写,是我看过的最用心的中文说明介绍,强烈推荐大家学习使用. Percona Xtrabackup 2.4.1 编译及软件依赖 centos5,6 需要升级cmake至2.8.2版本以上,解决:安装cmake版本3.4.3测试通过 centos5 gcc g++ 需要升级gcc至4.4以上上 ,解决:安装4.4.7测试通过 另外xtrabackcup另外Boost版本需要1.59.0版本或以上,目前centos5,6默认是1.41.0.解决:升级至1.59.…

percona-xtrabackup快速安装及其简单使用 cd /opt/环境:centos6.x yum -y install perl-DBIyum -y install perl-DBD-MySQL yum -y install perl-IO-Socket-SSL.noarchyum -y install perl-Time-HiRes  yum -y install perl-TermReadKeyyum -y install perl-ExtUtils-MakeMaker [root…

-----------------------------备份还原并启动数据库----------------------------------1.创建目录,并把下载的压缩文件拷贝到相应的目录[root@localhost opt]# mkdir -p /opt/xbackup_file[root@localhost opt]# cd /soft[root@localhost soft]# cp hins5246445_data_20180903064437.tar.gz /opt/xback…

      在使用mysql5.7的时候,发现了不少在mysql5.6上不曾见过的日志,级别为note, 最常见的note日志以下三种,下面我们来逐个解释. 第一种,Aborted connection . 如上图,信息如下: 2016-03-17T14:44:24.102542Z 59 [Note] Aborted connection 59 to db: ‘unconnected’ user: ‘mha’ host: ‘197.xx.xx.xx’ (Got an error reading…

这oracle官方推荐的在OLTP环境下,MySQL参数设置的最佳实践. 下面的参数设置,对系统的性能会很有帮助.但是建议大家还是结合实际情况使用. APPLIES TO: MySQL Server – Version 5.6 and laterInformation in this document applies to any platform. PURPOSE Strongly recommended initial settings for MySQL Server when used…

第一次这么近距离的接触源码,有点兴奋,又有点不知所措,尼玛随便一个源文件都有几千行,你说怎么看,还有一些数不清的数据结构,函数,类等乱七八糟的东西. 我装的mysql版本是5.7.12,然后运行平台是centos 6.5 x64 (应该是x64). 启动gdb gdb --args /usr/local/mysql-5.7.12/bin/mysqld 也可以用如下,如果你设置了链接的话 gdb --args mysqld 然后你就进入了gdb的环境中 在此呢,我们可以用b 函数名来添加断点 这个…

1,查看日志的ERROR 2018-05-23T01:26:59.230382Z 0 [Warning] 'NO_AUTO_CREATE_USER' sql mode was not set. 2018-05-23T01:26:59.230409Z 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled 2018-05-23T01:26:…

xtrabackup 版本对应: 2.4 专针对 5.7 开发的,兼容 5.6, 5.5 2.3 针对 5.6 开发的,兼容5.5 2.2 针对5.5 开发的 安装包下载: wget https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.4.9/binary/redhat/7/x86_64/percona-xtrabackup-24-2.4.9-1.el7.x86_64.rpm. 安装: yum localinstal…

  Preface       When we add a new node into PXC structure,it will estimate the mothed(IST/SST) to transfer data to the new node.It's no wonder that sst will be automatically choosed.What if a dropped node in PXC by accident want to rejoin the cluster…

Preface       Classic replication is commonly used in previous version of MySQL.It's really tough in managing them when our replications get into failures.Many new features are also depend on GTID.So it's urgent to use GTID replication as soon as pos…

  Preface       We all know that Xtrabackup is a backup tool of percona for innodb or Xtradb.It's usually used to back up whole databases physically.But how to restore a single innodb table from a full Xtrabackup after dropping it by accident?We can…

  Preface       Today I'm gonna test how to rescue a dropped table from binlog server based on a full Xtrabackup backup set.   Framework   Hostname IP/Port Identity OS Version MySQL Version GTID Mode Binlog Format zlm1 192.168.56.100/3306 master Cent…

  Preface       Yesterday,I've demonstratated how to rescue a droped and a truncated table based on mysqldump backup.Let's see what's different in rescuing them based on a backup set made by Xtrabackup.Binlog is also indispensable,if we want to rerie…

  Preface       I've been demonstrated how to implement a master-slave structure using mysqldump in my previous blog.I'm gonna use Xtrabackup to do it again now.   Framework   Hostname IP/Port Identity OS Version MySQL Version GTID Mode Binlog Format…

  Preface       Semi-synchronous replication is supported since MySQL 5.5 and then enhanced gradually in 5.6 & 5.7.It's also called enhanced semi-synchronous replicaiton in MySQL 5.7.The new method of ACK rule in 5.7(after_sync) make the consistency…

1.全量备份 [root@localhost lib]##innobackupex --defaults-file=$defaults_file --user=$mysql_username --password=$mysql_password --stream=tar $mysql_backup_dir | gzip - > $timeStart.bz.tar.gz 2> "$logfile" 备份目录/var/lib/mysqlsource, 如果下面要恢复,解压bz文…

[问题描述] 最近碰到有台MySQL实例出现了MySQL服务短暂hang死,表现为瞬间的并发线程上升,连接数暴增. 排查Error Log文件中有page_cleaner超时的信息,引起我们的关注: 2019-08-24T23:47:09.361836+08:00 0 [Note] InnoDB: page_cleaner: 1000ms intended loop took 24915ms. The settings might not be optimal. (flushed=182 and…

周末在一台MySQL实例上频繁做大批量的写入测试,无意中发现MySQL的errorlog中频繁出现如下的Note:page_cleaner: 1000ms intended loop took **** ms. The settings might not be optimal. (flushed=**** and evicted=0, during the time.) 一个典型的信息如下 InnoDB: page_cleaner: 1000ms intended loop took 4068…

一.Xtrabackup备份介绍及原理 二.Xtrabackup的安装 1.在centos7上基于yum源安装percona-xtrabackup软件 [root@node7 ~]# yum -y install http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm 注意:centos5不支持从远程位置直接安装软件包,必须先通过wget下载下来,然后在通过rpm…

######### 卸载原来系统安装的包 # yum remove -y java cvs libselinux-devel postgresql mysql ecj jna sinjdoc 依赖包安装 # yum install -y numactl git lrzsz screen make cmake gcc gcc-c++ libaio libaio-devel automake autoconf bzr bison libtool ncurses-devel ncurses vim n…

1.使用mydumper工具全库备份. 1)源码编译安装 2)全库备份 2.误操作truncate table gyj_t1;利用mysqldump的备份和binlog日志对表gyj_t1做完全恢复. 如下场景: create table gyj_t1(id int,name varchar(10)); insert into gyj_t1 values(1,'AAAAA'); commit; mysqldump全库备份... insert into gyj_t1 values(2,'BBBBB…

show engine innodb status 输出结果解读 基于MySQL 5.7.32 最近想整理一下show engine innodb status的解读,但是发现中文互联网上相关的信息要么是不完整,要么是有诸多错误,要么是版本过于老,很多新增条目并未包含,决定自己整理一份. 这里将 show engine innodb status 输出结果 按照章节部分依次剖析含义. 主要参考自官方文档 via Dash, 部分参考了https://cloud.tencent.com/devel…

一 简介: mysql note级别日志汇总二错误系列  1 Aborted connection    1 [Note] Aborted connection 61 to db: 'unconnected' user: ‘mha’ host: ‘197.xx.xx.xx(Got an error reading communication packets)    2 [Note] Aborted connection 61 to db: 'unconnected’' user: ‘mha’ h…

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Threading; using System.Net; using System.IO; using System.Configuration…

转载请注明出处: copperface:[Holograms 101D]一步步用Unity 开发 Hologram Holograms 101 该教程将带领你走完 Hologram 创建 的全过程.整个开发分成如下几个部分: 聚焦输入 gaze, 手势输入gesture , 声音输入voice input, 映射声音spatial sound and 映射地图spatial mapping. 整个教程大概耗时1个小时. 开始前的要求: 一台正确安装所有 开发工具tools的 win10 电脑 一…

  TensorFlow Saver 保存最佳模型 tf.train.Saver Save Best Model Checkmate is designed to be a simple drop-in solution for a very common Tensorflow use-case: keeping track of the best model checkpoints during training. The BestCheckpointSaver is a wrapper ar…

原文地址: https://blog.devart.com/increasing-sqlite-performance.html One the major issues a developer encounters when using the SQLite DBMS in his applications is its performance issue. Perhaps, a classic case everyone gets into when using SQLite for the…

1. 该博客介绍了pdb文件的概念,作用. 将该博文复制到最后了. https://devblogs.microsoft.com/devops/understanding-symbol-files-and-visual-studios-symbol-settings/ 2. MicroSoft visual studio 2019的官方介绍: https://docs.microsoft.com/en-us/visualstudio/debugger/specify-symbol-dot-pdb…