CIDR 2011 - Accepted Paper
The Complete Conference Schedule is here. A downloadable (zipped) PDF of the Proceedings (16MB) is here. The Keynote Data, Decisions, and Intelligence: Amidst the Foothills of a Revolution was presented by Eric Horvitz of Microsoft Research. The Best Paper Award (chosen by a subset of the program committee) was presented to Philip Bernstein, Colin Reid, and Sudipto Das for their paper "Hyder - A T
The problems with ACID, and how to fix them without going NoSQL
The problems with ACID, and how to fix them without going NoSQL (This post is coauthored by Alexander Thomson and Daniel Abadi) It is a poorly kept secret that NoSQL is not really about eliminating SQL from database systems (e.g., see these links). Rather, systems such as Bigtable, HBase, Hypertable, Cassandra, Dynamo, SimpleDB (and a host of other key-value stores), PNUTS/Sherpa, etc. are mostly
My Top 10 Assertions About Data Warehouses | blog@CACM | Communications of the ACM
Data warehouses, business intelligence, business analytics, and complex analytics are the subject of increasingly intense marketing wars, seemingly accelerated by Oracle’s recent introduction of the Exadata appliance. Here is my spin on the situation, organized as my top 10 assertions about this topic. Please note that I have a financial interest in several database companies, and may be biased in
Flashforge Guider 3 Plus 3D printer: Buy or Lease at Top3DShop
The Flashforge Guider 3 Plus is a large-scale professional FDM 3D printer designed for rapid prototyping. The sizable build volume of 600 mm height allows creating tall parts meeting the needs of most prototyping applications in automotive, architecture, art and design, and other industries. Featuring a CoreXY motion structure, the Guider 3 Plus can reach 250 mm/s printing speed while providing hi
Apache Cassandra | Apache Cassandra Documentation
What is Apache Cassandra? Apache Cassandra is an open source NoSQL distributed database trusted by thousands of companies for scalability and high availability without compromising performance. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data.
Errors in Database Systems, Eventual Consistency, and the CAP Theorem | blog@CACM | Communications of the ACM
Recently, there has been considerable renewed interest in the CAP theorem [1] for database management system (DBMS) applications that span multiple processing sites. In brief, this theorem states that there are three interesting properties that could be desired by DBMS applications: C: Consistency. The goal is to allow multisite transactions to have the familiar all-or-nothing semantics, commonly
Big Data Is Less About Size, And More About Freedom | TechCrunch
Big Data Is Less About Size, And More About Freedom Editor’s note: Big Data has been around for a long time between credit card transactions, phone call records and financial markets. Companies like AT&T, Visa, Bank of America, Ebay, Google, Amazon and more have massive databases they mine for competitive advantage. But lately, Big Data is finding its way to the smallest startups. The Web and clou
Xerial Wiki: 課題4 - 2009年度 生物情報科学科 情報基礎実験
External Sortingを実装する 締切： 2010年1月30日 提出先： http://lecture.utgenome.org/exp2009/ このページのアドレス： http://www.xerial.org/wiki/lecture/2009/Report4 ヒント External Merge Sort のアルゴリズム 講義資料中のMultiway Merge Sort Chapter 13: External Sorting Raghu Ramakrishnan, Johannes Gehrke. Database Management Systems. 3rd Edition. 入力： タブ区切りのテーブルデータ primary keyとして使う列番号と、データ型(整数、文字列、染色体名、strand)のリスト 例： (配列名, 染色体番号, s
The Scoop on Hadoop and Vertica - The Database Column
By Omer Trajman on September 25, 2009 2:02 PM | Permalink | Comments (0) | TrackBacks (0) Last month Vertica announced support for MapReduce. As readers of this blog know well we are big proponents of the one size does not fit all philosophy. Listening to our customers we also realized that MapReduce is a very good technology for large scale data processing including ETL, ELT, data cleansing, da
SIGMOD Record 27(4): The Asilomar Report on Database Research
The Asilomar Report on Database Research by Phil Bernstein, Michael Brodie, Stefano Ceri, David DeWitt, Mike Franklin, Hector Garcia-Molina, Jim Gray, Jerry Held, Joe Hellerstein, H. V. Jagadish, Michael Lesk, Dave Maier, Jeff Naughton, Hamid Pirahesh, Mike Stonebraker, and Jeff Ullman Executive Summary The database research community is rightly proud of success in basic research, and its remarkab
SSDの真の性能を引き出す MySQL 5.1.38 InnoDB Plugin - SH2の日記
X25-M、SSDで検索してくる方が非常に多いので、本ブログ内のSSD関連記事をリストしておきます。 MySQLのベンチマークを用いたIntel X25-M SSDの評価 (2009/03/25) SSDの真の性能を引き出す MySQL 5.1.38 InnoDB Plugin (本記事) MySQL 5.1.38から本体に同梱されるようになった、InnoDB Pluginの性能検証結果です。前回ご紹介したようにInnoDB Pluginには以下の強化点がありますが、本日はこのうちバックグラウンドI/Oスレッドの増加に焦点を当ててみたいと思います。 高速なインデックス作成。従来InnoDBのCREATE INDEXはテーブルの再作成を伴っていました テーブルとインデックスの圧縮 (検証結果その1、その2) INFORMATION_SCHEMAによるロック競合の検出 (検証結果) CPUスケ
VLDB 1999: 78-89
Cache Conscious Indexing for Decision-Support in Main Memory. Jun Rao, Kenneth A. Ross: Cache Conscious Indexing for Decision-Support in Main Memory. VLDB 1999: 78-89@inproceedings{DBLP:conf/vldb/RaoR99, author = {Jun Rao and Kenneth A. Ross}, editor = {Malcolm P. Atkinson and Maria E. Orlowska and Patrick Valduriez and Stanley B. Zdonik and Michael L. Brodie}, title = {Cache Conscious Indexing fo
正しいベンチマークをするための10のポイント
世の中ではたくさんの人が独自にベンチマークを行ない、独自に情報発信がされています。そのベンチマークの中には、非常に参考になるものもあれば、現実性に大きく欠けるものもあります。競合他社が、ライバル社の製品にとって不利な条件でベンチマークを行い、それを発信することも日常的に行われています。ベンチマークの結果を鵜呑みにすることは危険で、結果の意味を判断するスキルを持つことが重要です。これはプロジェクトにおいて負荷テストを行う場合にも重要です。負荷テストの条件設定が正しいかどうかを判断できるようになるためです。 ここでは、私がDBサーバのベンチマーク/負荷テストを行ったり結果を読んだりする上で、心がけているポイントを10個ほど紹介したいと思います。 ■ハードウェアに関する4つのポイント 1. ハードウェアのスペックと設定を注視する ハードウェア構成によってベンチマーク結果は劇的に変わるので、言わず
Prefix code - Wikipedia
A prefix code is a type of code system distinguished by its possession of the "prefix property", which requires that there is no whole code word in the system that is a prefix (initial segment) of any other code word in the system. It is trivially true for fixed-length code, so only a point of consideration in variable-length code. For example, a code with code words {9, 55} has the prefix propert
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Twitter / 萩原正義: Transactional Information ...
http://twitter.com/taroleo/status/3491957321