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Displaying posts with tag: storage engine (reset)
Setting up XFS on Hardware RAID — the simple edition

There are about a gazillion FAQs and HOWTOs out there that talk about XFS configuration, RAID IO alignment, and mount point options.  I wanted to try to put some of that information together in a condensed and simplified format that will work for the majority of use cases.  This is not meant to cover every single tuning option, but rather to cover the important bases in a simple and easy to understand way.

Let’s say you have a server with standard hardware RAID setup running conventional HDDs.

RAID setup

For the sake of simplicity you create one single RAID logical volume that covers all your available drives.  This is the easiest setup to configure and maintain and is the best choice for operability in the majority of normal configurations.  Are there ways to squeeze more performance out of a server by dividing the logical volumes: perhaps, but it requires a lot of fiddling and custom tuning to …

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Limelight Networks Chooses TokuDB for New Cloud Storage Service

Limelight Networks

Issue addressed: Managing metadata at exabyte scale

Delivering Agile Storage in the Cloud with Billions of Assets

The Company: Founded in 2001, Limelight Networks, Inc (NASDAQ: LLNW) is an Internet platform and services company that integrates the most business-critical parts of the online content value chain. Limelight’s cloud-based services enable customers to profit from the shift of content and advertising to the online world, from the explosive growth of mobile and connected devices, and from the migration of IT applications and services to the cloud. More than 1,800 customers worldwide use Limelight’s massively scalable services to better engage audiences, optimize advertising, manage and monetize …

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Fractal Tree Indexes – MySQL Meetup

At next month’s Boston MySQL Meetup, I will give a talk: “Fractal Tree Indexes – Theoretical Overview and Customer Use Cases.” The meetup is 7 pm Monday, January 9th, 2012, and will be held at MIT Building E51 Room 337e (corner of Ames & Amherst St, Cambridge, MA). Thanks to host Sheeri Cabral for the invitation.

Most databases employ B-trees to achieve a good tradeoff between the ability to update data quickly and to search it quickly. It turns out that B-trees are far from the optimum in this tradeoff …

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A Case for Write Optimizations in MySQL

As a storage engine developer, I am excited for MySQL 5.6. Looking at, there has been plenty of work done to improve the performance of reads in MySQL for all storage engines (provided they take advantage of the new APIs).

What would be great to add is API improvements to increase the performance of writes, and more specifically, updates. For many applications that perform updates, such as applications that do click counting or impression counting, there are significant opportunities for improving write performance.

Take the following example of click counting (or impression counting). You have a website and want to save the number of times links on your website have been clicked. Your table may look something like:

create table …

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Challenges of Big Databases with MySQL – OOW11 Presentation

Many database management tasks become difficult as you move from millions of rows and gigabytes of data to billions of rows and terabytes of data. Such tasks include ingesting data while maintaining indexes; changing schemas without downtime; and supporting connections, replication, and backup. For some scaling problems (connections and replication), MySQL® is better than most of the competition. For others, such as indexing, schema changes, and backup, MySQL has typically been harder to use. Fortunately, the tasks MySQL does well are in its core, whereas the tasks that are more difficult can be solved with storage engine plug-ins.

I recently gave a talk at Oracle Open World 11, a copy of which can be found here. This presentation discusses how MySQL’s storage engines have recently made dramatic progress in large database manageability.

A list of …

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TokuDB Stats

I’ve been benchmarking and testing TokuDB for a few months now. One goal of benchmarking is to understand what is limiting the performance of a particular configuration. I frequently use “show engine [innodb/tokudb] status;” from within the MySQL command line client as part of my research.

As I run most of my benchmarks on InnoDB as well as TokuDB, I noticed that there are significant differences in the way each present status information. InnoDB returns a single row, with various sections and carriage returns to maintain readability. In contrast, TokuDB presents one piece of status information per row (currently 139 rows as of TokuDB v5.0.5). This is an important distinction if you want to parse, compare, or store discrete status values. Here is sample output from each engine. I’ve cut out portions of each to maintain readability.

InnoDB plugin v1.0.13

mysql> show engine innodb status; …
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This Weekend in Japan

We were happy to see a lot of folks from Japan on Twitter this weekend having a discussion about MySQL and Tokutek. While we always endeavor to explain ourselves as simply as possible, hearing what users and peers have to say and ask in their native language is very helpful. Here is a sampling of several of the 30+ tweets and re-tweets (translations courtesy of a colleague I know from frequent past visits to Tokyo and Yokohama):


First, @frsyuki provided a general overview:

“TokuDB” 新種のMySQLストレージエンジン。INSERTが20〜80倍ほど速い、パーティションなしで数TBのデータを突っ込める、MVCCサポートなど。Fractal Treeというアルゴリズムを実装しているらしい。

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Dude, Where’s my Fractal Tree?

Unless you are Ashton Kutcher (@aplusk), or one of his Hollywood buddies, you don’t need to read any further. Allow me to explain…

Over the weekend, we launched our new website. This type of announcement used to be interesting in the high-tech world. I heard Kara Swisher of the WSJ’s All things D speak at a MassTLC event in May.  She admitted back in the 1990s, when the web was just getting into high gear, that a new website from an interesting company might actually get some coverage. Not anymore.

I’ve also been told at all the SEO classes I’ve …

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Indexing: The Director’s Cut

Thanks again to Erin O’Neill and Mike Tougeron for having me at the SF MySQL Meetup last month for the talk on “Understanding Indexing.” The crowd was very interactive, and I appreciated that over 100 people signed up for the event and left some very positive comments and reviews.

Thanks to Mike, a video of the talk is now available:

As a brief overview – Application performance often depends on how fast a query can respond and query performance almost always depends on good indexing. So one of the quickest and least expensive ways to increase application performance is to optimize the indexes. This talk presents three simple and effective rules on how to construct indexes around queries that …

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Don’t Thrash: How to Cache your Hash on Flash

Last week I gave a talk entitled “Don’t Thrash: How to Cache your Hash.” The talk took place at the Workshop on Algorithms and Data Structures (ADS) in a medieval castle turned conference center in Bertinoro, Italy. An earlier version of this work (with the same title) appeared at the HotStorage conference in Portland, OR. Tokutek co-founders Bradley, Martin, and I are coauthors on the work, along with students and other faculty at Stony Brook University.

The talk title is colorful and doggerel-y. Here’s what the title means. “Cache your hash”—the so-called Bloom Filter type data structure. A Bloom filter acts like a negative cache, …

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