memcached工作原理与优化建议 数据库 数据库学习 memcached
memcached工作原理与优化建议 工作原理 基本概念：slab，page，chunk。 slab，是一个逻辑概念。它是在启动memcached实例的时候预处理好的，每个slab对应一个chunk size，也就是说不同slab有不同的chunk size。具体分配多少个slab由参数 -f （增长因子）和 -n （chunk最小尺寸）决定的。...
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Redis与Memcached的区别 数据库 数据库学习 Redis Memcached
Redis与Memcached的区别 传统mysql+ Memcached架构遇到的问题 实际MySQL是适合进行海量数据存储的，通过Memcached将热点数据加载到cache，加速访问，很多公司都曾经使用过这样的架构，但随着业务数据量的不断增加，和访问量的持续增长，我们遇到了很多问题： 1.MySQL需要不断进行拆库拆表，Memcached也需不断跟着扩容，扩容和维护工作占据大量开发时间。...
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memcached的LRU删除机制 数据库 数据库学习 memcached LRU删除机制
memcached的LRU删除机制 1)memcached不会自动清空缓存的值 如果add了一个值，但不去get它，那么这个值过期了，它也不会被清空。 解释：memcached不自动检测和清空值，它只当你需要get这个值的时候，才检测这个值是否过期，过期则清空此值，并返回空。 PS：可使用stats命令查询 memcached的curr_items和total_items状态...
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DBA Productivity and Oracle Database 12.2
“Technology can be our best friend, and technology can also be the biggest party pooper of our lives. It interrupts our own story, interrupts our ability to have a thought or a daydream, to imagine...
View Article追踪网站大量502
昨天有一场活动，活动过程当中突然redis proxy发生了长时间GC，这段时间之内大量的报警。过了几分钟就恢复了，以为没事了，晚上发现proxy层有大量的502服务。就开始了第二天的追查。 通过查proxy日志，有这几个特点。 有大量的502 后端超时时间都是3秒 多次502之后，部分机器被下架 所有机器都被下架 猜想一：后端服务有大量的502...
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From the Neo4j Community: December 2016
ByRachel Howard, Community Editor | January 17, 2017 The Neo4j community is already off to a busy start for the new year with tons of new projects and drivers, but before we dive into new items from...
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Property Level Security with Neo4j Enterprise
In Neo4j 3.1 Enterprise edition, we introduced the first wave of security features that are coming down the pipeline. Now you can start off with Administrators, Architects, Publishers and Readers as...
View ArticleCouchDB Weekly News, February 9, 2017
Releases PouchDB 6.1.2 is released , with bugfixes for conflict resolution, PouchDB.defaults(), ajax headers, and more. Releases in the CouchDB Universe botkit-storage-couchdb 1.0.1 A CouchDB storage...
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Do you have real life struggles in SW development? Lessons learned in Ops?...
Everbattle a NoSQL data store for six hours straight? Installed an upgrade that destroyed a database? Have you spent two weeks learning a new library, language, or build tool, only to chuck it out the...
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News in brief: Yahoo faced with suit; dev hits back at support scammers; Note...
Your daily round-up of some of the other stories in the news Yahoo hit with class-action suit over breaches A Texas man has filed a class-action suit against Yahoo claiming that its huge security...
View ArticleHBase 1.3 发布，性能大幅提升
Apache HBase 1.3.0版在2017年1月中旬正式发布了，新版本支持分层数据的压缩和多个方面的性能提升，像预写日志（WAL）、一个新的 RPC 机制，等等。HBase 1.3.0一共修复了1,700多个问题。 在一些像 OpenTSDB...
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MongoDB数据库查询性能提高40倍的经历分享
前言数据库性能对软件整体性能有着至关重要的影响，本文给大家分享了一次MongoDB数据库查询性能提高40倍的经历，感兴趣的朋友们可以参考学习。背景说明1、数据库：MongoDB2、数据集： A：字段数不定，这里主要用到的两个UID和Date B：三个字段，UID、Date、Actions。其中Actions字段是包含260元素JSON数组，每个JSON对象有6个字段。共有数据800万条左右。...
View ArticleTransform into a full-fledged business oracle with this Big Data and Hadoop...
Crunching business numbers isn’t just something that happens anymore. The study of a company’s analytics now falls under the heading of Big Data ― and if a business doesn’t have someone versed in Big...
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Get this Big Data and Hadoop Analytics Certification course Bundle for just $59
Today's highlighted deal comes from ourOnline Courses section of Neowin Deals, where you can save 92% off* the Big Data and Hadoop Analytics Certification Bundle . Develop hard analytical skills with...
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MapR Platform Offers Persistent Data Access for Containerized Applications
This is the container age. The growing use of services like Docker is transforming the way that software is being handled within enterprises. However, this rise in container utilization does throw...
View ArticleBig Data and Virtualization: A joint Cloudera and VMware Technical Talk
This technical talk was given at the VMworld conference events in the US and Europe in the past few months. In case you missed it when it occurred live, wethought wewould give you a recording of it...
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Nagios 监控MongoDB
随着mongodb的广泛使用监控mongodb的业务现在已经变得十分重要了现在我们就来讨论一下nagios中mongodb的监控方法。 一:下载nagios-plugin-mongodb插件。 下载地址 https://github.com/mzupan/nagios-plugin-mongodb 二:把下载压缩包中的check_mongodb.py插件上传至nagios服务器。...
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The 5-Minute Interview: John Swain, Data Science Product Manager at Right...
ByBryce Merkl Sasaki, Aspiring Graphista | February 10, 2017 “When I initially chose Neo4j, it was a startup project. I found it extremely useful and easy to use, and immediately realized it was the...
View ArticleNewsBits: RethinkDB lives, Redis and PostgreSQL futures, FOSDEM, Rust and Wuzz
newsbits rethinkdb redis NewsBits: RethinkDB lives, Redis and PostgreSQL futures, FOSDEM, Rust and Wuzz NewsBitsfor the week ending 10th February - RethinkDB has a new home, Redis's future is being...
View ArticleHacking on Pagure CI
“Ahaa!” I got a lot of ahaa moments when I was hacking on Pagure CI , Pagure CI’s initial draft was laid by lsedlar and I have blogged about it followed by me and Pingou. Pingou has done really...
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