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Replication of the NOW() function (also, time travel)

 | November 28, 2012 |  Posted In: Insight for DBAs, MySQL

Notice the result of the NOW() function in the following query. The query was run on a real database server and I didn’t change the clock of the server or change anything in the database configuration settings.

You may proceed to party like it is 1999. How can the NOW() function return a value […]

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The case for getting rid of duplicate “sets”

 | May 17, 2011 |  Posted In: MySQL

The most useful feature of the relational database is that it allows us to easily process data in sets, which can be much faster than processing it serially. When the relational database was first implemented, write-ahead-logging and other technologies did not exist. This made it difficult to implement the database in a way that matched […]

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Checking the subset sum set problem with set processing

 | May 16, 2011 |  Posted In: MySQL

Hi, Here is an easy way to run the subset sum check from SQL, which you can then distribute with Shard-Query:

Notice there is no 16 in the list. We did not pass the check. There are enough 15s though. The distinct value count for each item in the output set, must at least […]

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Distributed set processing performance analysis with ICE 3.5.2pl1 at 20 nodes.

 | May 14, 2011 |  Posted In: MySQL

Demonstrating distributed set processing performance Shard-Query + ICE scales very well up to at least 20 nodes This post is a detailed performance analysis of what I’ve coined “distributed set processing”. Please also read this post’s “sister post” which describes the distributed set processing technique. Also, remember that Percona can help you get up and […]

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Distributed Set Processing with Shard-Query

 | May 14, 2011 |  Posted In: MySQL

Can Shard-Query scale to 20 nodes? Peter asked this question in comments to to my previous Shard-Query benchmark. Actually he asked if it could scale to 50, but testing 20 was all I could due to to EC2 and time limits. I think the results at 20 nodes are very useful to understand the performance: […]

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Shard-Query EC2 images available

 | May 11, 2011 |  Posted In: MySQL

Infobright and InnoDB AMI images are now available There are now demonstration AMI images for Shard-Query. Each image comes pre-loaded with the data used in the previous Shard-Query blog post. The data in the each image is split into 20 “shards”. This blog post will refer to an EC2 instances as a node from here […]

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Shard-Query turbo charges Infobright community edition (ICE)

 | May 6, 2011 |  Posted In: MySQL

Shard-Query is an open source tool kit which helps improve the performance of queries against a MySQL database by distributing the work over multiple machines and/or multiple cores. This is similar to the divide and conquer approach that Hive takes in combination with Hadoop. Shard-Query applies a clever approach to parallelism which allows it to […]

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