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4 changes: 2 additions & 2 deletions _includes/tag_cloud.html
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{% assign tags = site.tags | sort %}
{% for tag in tags %}
<span class="site-tag">
<a href="{{ site.tag_page }}{{ tag | first | slugify }}/"
<a href="{{ site.tag_page }}{{ tag[0] | replace: ' ', '_' }}/"
style="font-size: {{ tag | last | size | times: 4 | plus: 80 }}%">
{{ tag[0] | replace:'-', ' ' }} ({{ tag | last | size }})
{{ tag[0] }} ({{ tag | last | size }})
</a>
</span>
{% endfor %}
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7 changes: 6 additions & 1 deletion _layouts/post.html
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<span>[
{% for tag in page.tags %}
{% capture tag_name %}{{ tag }}{% endcapture %}
<a href="/tag/{{ tag_name }}"><code class="highligher-rouge"><nobr>{{ tag_name }}</nobr></code>&nbsp;</a>
{% if forloop.first %}
{% assign padding = '' %}
{% else %}
{% assign padding = ',&nbsp;' %}
{% endif %}
<a href="{{ site.tag_page }}{{ tag_name | replace: ' ', '_' }}"><code class="highligher-rouge"><nobr>{{ padding }}{{ tag_name }}</nobr></code></a>
{% endfor %}
]</span>
</div>
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2 changes: 1 addition & 1 deletion _posts/2005-08-05-ISOLATION-LEVEL.md
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---
layout: post
title: 事务的隔离级别(Transaction Isolation Level)
tags: SQL
tags: SQL ACID
---

事务隔离级别是对事务之间的隔离性作出的一个度量。它通常以下面的几个现象进行考察。注意这些现象都是从读的角度来分析的,即分析写操作对读操作的影响。
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2 changes: 1 addition & 1 deletion _posts/2005-10-14-GPROF.md
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---
layout: post
title: GNU gprof 的使用以及常见问题
tags: gprof
tags: gprof perf
---

gprof 对于 profiling 非常有用,不过初学者可能会遇到一些障碍。下面我们从最简单的例子开始,一步步深入,希望能够容易明白一点了。
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layout: post
title: “木桶原理”到底源自哪里?
original: https://blog.csdn.net/zedware/article/details/5078413
tags: Misc
---

很多人都喜欢说这个“木桶原理”,在中文MBA智库百科中就有这么[一条](http://wiki.mbalib.com/wiki/%E6%9C%A8%E6%A1%B6%E5%8E%9F%E7%90%86)。甚至还有“[反木桶原理](http://wiki.mbalib.com/wiki/%E5%8F%8D%E6%9C%A8%E6%A1%B6%E5%8E%9F%E7%90%86)”。智库百科中说“木桶原理是由美国管理学家[彼得](wiki/%E5%BD%BC%E5%BE%97 "彼得")提出的。”可是我Google搜索“Cannikin Law“、“Wooden Barrel Principle”、“Wooden Barrel Theory”等,出来的中英文结果中看起来都是中国人的文章。说的这个管理学家应该就是[彼得·德鲁克](http://wiki.mbalib.com/wiki/%E5%BD%BC%E5%BE%97%C2%B7%E5%BE%B7%E9%B2%81%E5%85%8B)[Peter Drucker](http://en.wikipedia.org/wiki/Peter_Drucker#Career))吧。可是 Wiki 中并没有说他提出了什么“木桶原理”啊。
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layout: post
title: 介绍Stonebraker和DeWitt教授的文章
original: https://blog.csdn.net/zedware/article/details/5094852
tags: DBMS MapReduce
---

*以下引用的两篇文章作者为:David J. DeWitt and Michael Stonebraker* 
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layout: post
title: 软件可靠性——从2003年北美大停电说起
original: https://blog.csdn.net/zedware/article/details/5430879
tags: Misc
---

2003年北美大停电给人造成的印象比较深刻,据称最后发现其原因与GE公司的XA/21系统中的软件缺陷有关系:[Software Bug Contributed to Blackout](http://www.securityfocus.com/news/8016)。电力系统作为一个高度复杂的系统,不仅涉及到众多的软件和硬件,也涉及到人。系统本身应有各种各样的报警和预警措施,为什么全部都不好使了呢?[反思美加大停电](http://www.serch.gov.cn/jgyj/bg_05012903.htm)一文对此做出了一些专业的分析。
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layout: post
title: Oracle与MySQL中“可串行化”的对比测试
original: https://blog.csdn.net/zedware/article/details/5529389
tags: MySQL Oracle
tags: MySQL Oracle ACID
---

Thomas Kyte (Oracle 世界中那个著名的 Tom)在“Oracle 9i&10g编程艺术”一书中为了说明事务的隔离级别,提供了一些例子。这里我们来看看“可串行化”级别下的表现。
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1 change: 1 addition & 0 deletions _posts/2010-04-30-A short puzzle about heap expansion.md
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layout: post
title: A short puzzle about heap expansion
original: https://blog.csdn.net/zedware/article/details/5547726
tags: memory
---
https://blogs.msdn.com/oldnewthing/archive/2010/04/29/10004218.aspx

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1 change: 1 addition & 0 deletions _posts/2010-05-13-进程之间的互操作.md
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layout: post
title: 进程之间的互操作
original: https://blog.csdn.net/zedware/article/details/5588434
tags: Misc
---

两个进程之间如果要做点什么交互的话,总得通过一些机制来实现;这就像我们两个人之间要沟通,总得通过语言、文字等各种机制来实现一样。如果两个进程都在一台机器上,交互的机制就显得稍微多一点,例如可以用 shared memory、message queue、file、pipe、socket 等各种技术。如果两个进程不在同一台机器上,可以的选择显得稍微少一点,但是还可以用 socket 等。如果开发应用时总是要考虑这么底层细节的事情,那效率就太低了。在应用开发的需求牵引下,大家发明了从 RPC、CORBA、RMI,到 SOAP、WebService 之类的不同层次的技术。
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1 change: 1 addition & 0 deletions _posts/2010-07-01-最近遇到的几个有趣的工具.md
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layout: post
title: 最近遇到的几个有趣的工具
original: https://blog.csdn.net/zedware/article/details/5707948
tags: Misc
---

1. 网址缩短服务-像是个URL别名服务
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layout: post
title: Quick reference for Fedora Core 13's installation on VMware 6.5
original: https://blog.csdn.net/zedware/article/details/5899759
tags: Linux VM
---

记性没有以前那么好了,什么都能记住。想起来读书时的一句话“好记性不如烂笔头”。还是将遇到的小问题都记录下来吧,免得日后又来折腾。
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1 change: 1 addition & 0 deletions _posts/2011-01-05-Notes on deduplication.md
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layout: post
title: Notes on deduplication
original: https://blog.csdn.net/zedware/article/details/6118892
tags: Dedup
---

Data de-duplication是存储中比较成熟的技术了。无论个人的桌面机,还是企业的服务器,或是备份用的存储系统中,都存在大量的重复数据。最简单的一种就是同一个文件存有多份,稍微复杂一点的是类似的文件存在多份。如果是备份系统,则数据的多次全备份之间更是存在着大量的荣誉数据,即便是多次增量备份或差分备份之间,也存在着很多的冗余数据。解决这些冗余数据,减少存储空间,提高恢复效率的办法有很多。最简单也最容易想到的是Single Instance Storage,也就是每个同样的文件仅仅保留一份,而不是重复保留。稍复杂的办法可以借鉴版本管理的办法,对于同一个文件的不同版本仅仅保存差异部分。更复杂的办法是识别不同文件/对象之间的重复部分,将其冗余消除,仅记录一份。不同文件或对象之间重复部分的识别比较复杂,又要保证速度,又要保证廉价,更要保证数据完整性。不过业界已经有了很多成熟的算法和产品,例如Data
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1 change: 1 addition & 0 deletions _posts/2011-01-19-Build distcc from source code.md
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layout: post
title: Build distcc from source code
original: https://blog.csdn.net/zedware/article/details/6153307
tags: C cplusplus
---

distcc is a useful tool to speed up the build. We can dowload it from:
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layout: post
title: Optimizing the Linux kernel for Database?
original: https://blog.csdn.net/zedware/article/details/6169265
tags: Linux DBMS
---

Oracle is now a big player in the Linux community. Vetical integration is a trend in the computer world.
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1 change: 1 addition & 0 deletions _posts/2011-02-16-DLL hell again - this time on Linux.md
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layout: post
title: DLL hell again - this time on Linux
original: https://blog.csdn.net/zedware/article/details/6189219
tags: Linux
---

突然发现Fedora中的yum不好使了,一执行就报错,说什么不能import某某库。
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layout: post
title: Collections of Data Deduplication Links
original: https://blog.csdn.net/zedware/article/details/6225162
tags: Dedup
---

1. 入门
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1 change: 1 addition & 0 deletions _posts/2011-03-07-Bloom Filter in Oracle Database.md
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layout: post
title: Bloom Filter in Oracle Database
original: https://blog.csdn.net/zedware/article/details/6230135
tags: Oracle DBMS
---

Bloom Filter用的范围很广,不仅在Search Engine中大量采用,在Data Deduplication中也频频遇到。那么它在数据库中的应用情况怎么样呢?放狗找一下,这个比较有意思:[http://antognini.ch/papers/BloomFilters20080620.pdf](http://antognini.ch/papers/BloomFilters20080620.pdf)
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1 change: 1 addition & 0 deletions _posts/2012-02-11-NETWORKER.md
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layout: post
title: How to install NetWorker on Linux?
original: https://blog.csdn.net/zedware/article/details/7251614
tags: Linux NetWorker
---

NetBackup和NetWorker是两个主要的企业级备份软件,相比桌面上的软件,安装和使用都有点麻烦。这里采用的是一个x86 32bit的NetWorker试用版本。安装/启动GUI的过程中可能会出现一些小问题,如果不幸遇到了,那就一一解决吧。我曾经遇到过Sybase、Java等各模块的问题,通过分析log文件和查找支持文档,最终都解决了。
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1 change: 1 addition & 0 deletions _posts/2012-02-11-State Machine and Event Processing.md
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layout: post
title: State Machine and Event Processing
original: https://blog.csdn.net/zedware/article/details/7251583
tags: [State Machine]
---

列了个提纲,一直没有写完。
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layout: post
title: Weaving Relations for Cache Performance
original: https://blog.csdn.net/zedware/article/details/7251663
tags: DBMS
---

虽然这是篇较早的论文,但是对实现数据库存储的开发者,对要深入理解行式存储、列式存储、混合存储方式的技术人员来说还是很有参考价值的。严格的关系数据库理论并不要求应用程序开发者了解表的存储格式,但工程实践中并没有那么完美的好事。不同的存储格式对不同类型的应用或多或少存在一些实现/性能/使用上的影响。某些评论批评Oracle一直没有实现列式存储,所以对数据仓库的支持效率不够好。实际上甲骨文也是不得已,一个庞大的企业级软件哪像一个小软件那样可以随便改来改去啊。
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1 change: 1 addition & 0 deletions _posts/2012-02-12-有关Splay Tree的一点感想.md
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layout: post
title: 有关Splay Tree的一点感想
original: https://blog.csdn.net/zedware/article/details/7253327
tags: [Splay Tree]
---

Splay Tree是一种有趣的Binary Search Tree。Wikipedia说它的缺点为:
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layout: post
title: Disk Corruption以及它们对DBMS的影响
original: https://blog.csdn.net/zedware/article/details/7269074
tags: DBMS
---

众所周知,软硬件都有不靠谱的时候。可问题是一般人很难获取这些系统在实际使用中的故障率。作为这些产品的生厂商,一般都有一些方法来获取实际安装部署以及运行的情况,自然的,它们也掌握了很多实际的故障数据(不过它们未必会如实公开)。对于那些故障率不太高的情形,只有在安装部署的数量特别大时,才可能捕获到较大的故障出现次数。An Analysis of Data Corruption in the Storage Stack分析了存储系统中的Data Corruption:
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1 change: 1 addition & 0 deletions _posts/2012-02-25-NAND闪存的黯淡未来.md
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layout: post
title: NAND闪存的黯淡未来
original: https://blog.csdn.net/zedware/article/details/7294266
tags: SSD
---

这篇 Paper 名为 The Bleak Future of NAND Flash Memory,也即 NAND 闪存的黯淡未来。写论文的家伙怎么也搞得像标题党似的。国内外的科技媒体对此文的论点都有转载。
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2 changes: 1 addition & 1 deletion _posts/2012-08-15-Berkeley DB设计经验.md
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layout: post
title: Berkeley DB设计经验
original: https://blog.csdn.net/zedware/article/details/7870754
tags: [Berkeley DB]
tags: [Berkeley DB, DBMS]
---

很久没有做翻译这种苦力活了,这是断断续续折腾了好久周的结果 - [http://www.ituring.com.cn/article/details/8111](http://www.ituring.com.cn/article/details/8111)
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---
layout: post
title: 给SPECsfs2008的数据画个图(图中少了个字母s)
title: 给SPECfs2008的数据画个图(图中少了个字母s)
original: https://blog.csdn.net/zedware/article/details/8302250
tags: [dot, SPECfs, File System]
---

![SPECfs2008](/images/specfs2008.png "SPECfs2008")
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layout: post
title: 读《The End of an Architectural Era (It’s Time for a Complete Rewrite)》
original: https://blog.csdn.net/zedware/article/details/19846955
tags: DBMS
---

这是Stonebraker等发表在VLDB ’07, September 23-28, 2007, Vienna, Austria的一篇文章。看起来引用率还很高:
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1 change: 1 addition & 0 deletions _posts/2014-02-28-Collection of debates on O_DIRECT..md
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layout: post
title: Collection of debates on O_DIRECT
original: https://blog.csdn.net/zedware/article/details/20161041
tags: [Linux, O_DIRECT, File System]
---

看看各种不同角色的讨论,还是有点意思的。先从 Linus 的这个开始:[O_DIRECT
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layout: post
title: Different ways to get the symbol name and ...
original: https://blog.csdn.net/zedware/article/details/20306143
tags: cplusplus C
---

万一你拿到 callstack 的是一堆的地址,不用担心,只要你有符号信息,就可以用这些命令恢复出熟悉的样子了。
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layout: post
title: 打洞(Punch a hole):回收存储空间(File、Block以及其他)
original: https://blog.csdn.net/zedware/article/details/21747885
tags: [Linux, Punch hole, File System]
---

打洞(Hole-punching)这个看起来有点土,容易让人想到“龙生龙凤生凤,老鼠的儿子会打洞”。在虚拟机出现之前,这个问题可能还不太被大家所了解。VM通常会有个很大的文件作为Guest OS的存储,可是你在Guest OS里头删除了很多文件后,这个文件还是占据了很多的空间。怎么让Host文件的文件系统回收掉这些空间呢?如果这些存储是在Amazon这样的地方,占据一堆不用的空间会导致花了冤枉钱。
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layout: post
title: 试试Fedora 20里头的File System on File
original: https://blog.csdn.net/zedware/article/details/21884243
tags: [Linux, FSoF, File System]
---
Create a file to host the fs.  Can also use dd here instead of truncate.
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1 change: 1 addition & 0 deletions _posts/2014-03-26-优雅的cancel一个pthread线程.md
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layout: post
title: 优雅的cancel一个pthread线程
original: https://blog.csdn.net/zedware/article/details/22213427
tags: thread C cplusplus
---

这是一个基本的问题。仔细看看man pages,应该就可以理解其中的道理。不过我看到的几个man pages的详略程度有所不同。关键的函数是pthread_cleanup_push()和pthread_cleanup_pop()以及由此衍生出来的xxx_np(不可移植版本)。
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1 change: 1 addition & 0 deletions _posts/2014-03-27-NVMe终于有产品支持了.md
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layout: post
title: NVMe终于有产品支持了
original: https://blog.csdn.net/zedware/article/details/22324575
tags: SSD
---

硬件的进步总是会带来接口以及软件的慢慢进步。先来看看这个新闻:http://www.storagereview.com/samsung_16tb_nvme_ssd_featured_in_the_new_dell_poweredge_r920_server。它说三星和戴尔合伙要在新的Dell PowerEdge R920服务器里头采用1.6TiB的NVMe SSD,这是世界上第一个支持NVMe接口的SSD。摘录几个关键数字:
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1 change: 1 addition & 0 deletions _posts/2014-03-28-VM-are-Virtual-Volume-vVol.md
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layout: post
title: VMware Virtual Volume - vVol
original: https://blog.csdn.net/zedware/article/details/22441709
tags: VM vVol
---

Virtual volume在两年前还是很火热的概念,例如:http://blogs.vmware.com/vsphere/2012/10/virtual-volumes-vvols-tech-preview-with-video.html . 可是2013年的VMware大会上就没有那么多消息了,例如:http://www.networkcomputing.com/storage-networking-management/vmware-gets-real-about-virtual-storage/240161026 . 当然也不会彻底销声匿迹:http://virtualgeek.typepad.com/virtual_geek/2013/08/vmworld-2013-vvol-update-and-vm-granular-storagenow.html . 2014年到处是VSAN。
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1 change: 1 addition & 0 deletions _posts/2014-04-01-我的Vim为什么不变色了.md
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layout: post
title: 我的Vim为什么不变色了
original: https://blog.csdn.net/zedware/article/details/22758215
tags: Linux vim
---

今天虽然是愚人节,也得写点有用的东西,不能忽悠大家当April fool。最近用的机器有点多,换来换去的,发现有个机器的Vim竟然不会变色了。试了几次,发现了一个细节的区别:这台机器的vim的可执行文件名是vi,不是vim,而且它不是个符号链接。以下是详细的过程:
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4 changes: 1 addition & 3 deletions _posts/2014-04-03-从FusionIO的NVM压缩接口谈起.md
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layout: post
title: 从FusionIO的NVM压缩接口谈起
original: https://blog.csdn.net/zedware/article/details/22897161
tags: SSD
---

厂商的宣传总喜欢搞得很吸引人:Fusion-io宣称可以翻倍MySQL的容量,http://www.zdnet.com/fusion-io-claims-to-double-mysql-capacity-7000027970/。Google一下会出现很多类似的内容。可惜宣传稿只是说可以这样、可以那样,显得很是高大。要想知道得更细一点,还得从基础学起。先看看:https://github.com/opennvm/nvm-primitives/。
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“A storage device that supports Atomic Write (AW) guarantees that either all the blocks in a writeoperation are written or no blocks are written at all.”The 2011 Ouyang paper implemented an atomic write primitive with a NAND-flash based storage device for aMySQL database (see [http://www.mysql.com](http://www.mysql.com/))
with the InnoDB transactional storage engine (seehttp://www.innodb.com), measuring:a)  43% reduction in data written to storage;b)  20% reduction in transaction latency; andc)  33% throughout improvement  相信上面的这几个数字很多人以前都看到过。从系统的角度看,Fusion-io做的事情是把文件系统等得功能往下层挪了挪,能够更好更快捷的发挥闪存的优势,而不是依靠各层系统软件的慢慢进步。这个SCSI文档值得阅读。




2 changes: 1 addition & 1 deletion _posts/2014-06-11-MySQL的词法分析漫谈.md
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title: MySQL的词法分析漫谈
original: https://blog.csdn.net/zedware/article/details/30085989
tags: MySQL
tags: MySQL DBMS
---

UPDATE: [MySQL 词法分析及其性能优化](http://mysql.taobao.org/monthly/2017/02/04/)
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title: 回顾一下著名的GFS论文
original: https://blog.csdn.net/zedware/article/details/33397479
tags: GFS
---

互联网时代流行打造自己的系统,这个趋势应该是从Google开始的。
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1 change: 1 addition & 0 deletions _posts/2014-06-30-回顾一下著名的BigTable论文.md
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title: 回顾一下著名的BigTable论文
original: https://blog.csdn.net/zedware/article/details/35875485
tags: BigTable
---

GFS 解决了某些业务场景对分布式文件系统需求,很自然的,也有某些业务仅仅靠文件系统用起来还是不那么方便,它们需要分布式数据库系统。BigTable 就是 Google 为了解决内部对大规模结构化数据处理的需求而产生的。论文摘要涉及的“关键”字为:
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title: 重读A Critique of ANSI SQL Isolation Levels
original: https://blog.csdn.net/zedware/article/details/42399375
tags: SQL
tags: SQL ACID
---
A Critique of ANSI SQL Isolation Levels
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layout: post
title: 说说FoundationDB
original: https://blog.csdn.net/zedware/article/details/44729051
tags: FoundationDB DBMS
---

#FoundationDB
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2 changes: 1 addition & 1 deletion _posts/2016-03-31-嵌套查询的查询优化.md
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title: 嵌套查询的查询优化
original: https://blog.csdn.net/zedware/article/details/51029365
tags: SQL
tags: SQL DBMS
---

Table of Contents
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2 changes: 1 addition & 1 deletion _posts/2016-10-09-MYSQL-HISTOGRAM.md
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title: MySQL 8.0 直方图的实现与分析
original: http://mysql.taobao.org/monthly/2016/10/09/
tags: MySQL
tags: MySQL Histogram
---

直方图(Histogram)是 RDBMS 中提供的一种基础的统计信息,最典型的用途是估计查询谓词的选择率,以便选择优化的查询执行计划。常见的直方图种类有:等宽直方图、等高直方图、V-优化的直方图,MaxDiff 直方图等等。RDBMS 产品最初使用的直方图非常简单(只有一个桶),后来逐步演化到等宽直方图、等高直方图等。MariaDB 10.0.2 就已在 server 层实现了直方图功能,参考 Take into account the selectivity 和 Histogram based statistics。MySQL 在8.0.0 中也引入了直方图,参考WL#8706和WL#8707。
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title: The RISC-V Memory Consistency Model
tags: RISC-V
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The memory consistency model of different hardware is diverse. The future may be unified by sequential consistency model.
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