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KeepAlived+MySQL互为主从
解决Master单点问题，两台mysql互为主备，双向replication。当一master挂了，则将slave切换为master，继续工作。好，给定两台机器主机A：192.168.1.201主机B：192.168.1.202一、互为主从1.配置主机A上，vim /etc/my.cnf，添加：[mysqld]log-bin=mysql-binserver-id=1...
View ArticleYet another sstable corruption - EOFException
During starting up a apache cassandra 1.2 instance, I noticed in the log of the following error. INFO 10:38:23,334 Opening...
View ArticleCouchDB Weekly News, June 30, 2016
Major Discussions 2.0 & windows: status update (see thread ) Joan Touzet provides an update on status of the CouchDB 2.0 port to Microsoft Windows. Releases in the CouchDB Universe...
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Monitoring Apache Cassandra Metrics With Graphite and Grafana
1. Overview Despite the fact thatApache Cassandra provides a large number of metrics through the popular Metrics library, it does not, however, provide any out-of-the-package solutions to monitor these...
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Florida Power & Light puts energy into predictive maintenance with...
Energy is an expensive business. As a utility provided to millions, Florida Power and Light wants to be able to better serve its customers by accurately predicting when things are going to go wrong on...
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Troubleshooting MongoDB Replication Cluster
July 1, 2016 by Tarun Saxena | 0 comments AWS , Database , DevOps , Technology MongoDB is an efficient, reliable and fast processing database for the applications which generate the data in...
View ArticleBig Data’s Required and Recommended Technical Skills
A common question beginners ask about Hadoop are the technical skills needed to get started. This helps level set what skills you need before you embark on a big data journey. For developers and...
View Article开源数据库的现状
数据库作为业务的核心，在整个基础软件栈中是非常重要的一环。近几年社区也是新的方案和思想层出不穷，接下来我将总结一下近几年一些主流的开源数据库方案和背后的设计思想以及适用场景。本人才疏学浅如有遗漏或者错误请见谅。本次分享聚焦于数据库既结构化数据存储 OLTP 及 NoSQL 领域，不会涉及 OLAP、对象存储、分布式文件系统。 开源RDBMS与互联网的崛起...
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The 5-Minute Interview: Andy Mulholland, VP & Principal Analyst at...
ByBryce Merkl Sasaki, Aspiring Graphista | July 1, 2016 For this week’s 5-Minute Interview, I spoke with Andy Mulholland , Vice President and Principal Analyst at Constellation Research . I...
View ArticleRESTful登录设计－基于Spring及Redis的Token鉴权
什么是REST REST(Representational State Transfer)是一种软件架构风格。它将服务端的信息和功能等所有事物统称为资源，客户端的请求实际就是对资源进行操作，它的主要特点有： 每一个资源都会对应一个独一无二的url 客户端通过HTTP的GET、POST、PUT、DELETE请求方法对资源进行查询、创建、修改、删除操作 客户端与服务端的交互必须是无状态的...
View Articlequick hint: neo4j backup via ssh
Neo4j Enterprise edition ships with a feature to take consistent backups while the database is up and running. Using config option dbms.backup.address you can expose the port to the outside. However...
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在MongoVUE中发现插入的时间和实际的时间相差8小时？
在Mongodb使用过程中，发现一个问题，就是我们插入Date类型时会发现保存到mongodb中的数据却晚了8个小时，这是为什么呢？我想大家在使用客户端工具如MongoVUE时，也会发现查询出来的数据也是晚了8个小时的？下面简单描述下原因。 上面的两个问题，我们依次来看是为什么？ （1）在Java编码过程中，使用mongodb的java驱动包保存数据时，数据库里的数据比实际时间少了8个小时，为什么？...
View Articlecassandra并发技术介绍
摘要本文主要介绍cassandra线程技术，cassandra的实现是基于java的，所以线程技术使用的也是jdk包提供的线程类。cassandra是分布式数据库，整个并发架构是基于阶段事件驱动架构(staged envent-driven architecture)它能够利用queue将复杂的事件驱动分解为各个阶段。一.java并发Executor...
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数据库基础知识汇总
最近在复习期末考，就顺便把这些笔记保存下来，也方便以后查看，涉及的都是一些基础知识，大牛勿喷啊，有错误之处欢迎指教~~~~首先，当然得记住一些常用的词汇啊！！！下面就把会出现的词汇都大概的总结出来，方便查看，省得满文章的去找(英语好的就自行跳过吧！)。当然，不是纯纯的单词翻译，后面跟的文字可能是翻译也可能是他用到的地方。-DBCC ShrinkDataBase ：收缩数据库- Constraint...
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使用Navicat逆向建立Mysql数据模型--高效记忆数据逻辑关系
CleverCode最近在熟悉公司的老业务，这就需要知道系统的表与表之间的关系，当表的数量比较大的时候，就会发现如果不画图梳理的话，很难记住表之间的关联，以及数据之间的关系。特别是时间一长，更容易忘记。这里CleverCode推荐一个方式，很有效的曲梳理数据的模型和关系--Navicat。 1 Navicat下载...
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This Week at Hadoop Summit: Learn how Hive LLAP enables sub-second SQL on...
The most significant new feature in Apache Hive 2, to be included in the upcoming HDP 2.5 release is LLAP (Live Long and Process). LLAP enables as fast as sub-second SQL analytics on Hadoop by...
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Two Easy Ways To Poll Apache Cassandra Metrics Using JMX Http Bridge
There are many different methods to monitorApache Cassandra metrics. From a high level, these methods can be grouped in two general types of techniques: push versus poll. The meaning of the two types...
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This week's database news, issue 111
Analyzing the Graph of Thrones with Neo4j A fun walk through a practical use for graph databases based around interactions in a book that led to the TV show, Game of Thrones. William Lyon tutorial...
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The sweet spots of cloud access and organization overhaul | #HS16SJ
As the potential for gathered data draws in more and more companies from virtually every industry, many are finding that their internal organization and legacy architectures aren’t quite up to snuff...
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