by Peter Zaitsev | Aug 12, 2007 | Percona Events
Yesterday I ran into the article which sheds some light on FaceBook search implementation. As we’re recently a lot into search having implemented a bunch of search projects ourselves and helped number a of customers with their full text search needs I decided to...
by Peter Zaitsev | Aug 11, 2007 | Percona Events
Friends are pointing me to the article saying SpyLOG, the startup which I co-founded back in 1999 was sold the other day to the MasterHost. The amount is not disclosed but it is estimated to be $3M – amount not worth mentioning for USA market but quite decent...
by Vadim Tkachenko | Aug 9, 2007 | Percona Events
I’ve just read post http://www.planetmysql.org/kaj/?p=123 about MySQL plans of including community contributions into releases. I understand MySQL’s interest to make releases stable, and includes contributions only into development tree, but this is not...
by Peter Zaitsev | Aug 9, 2007 | Percona Events
Yesterday Kaj Published changes to MySQL Community Release Policies. I knew about them a bit in advance but now they are public I can comment a bit. In general I’m disappointed and think this is moving in the wrong direction, it also makes me to think hard if...
by Vadim Tkachenko | Aug 6, 2007 | Insight for Developers
Recently we were puzzled by question how query_cache works with column level privileges. The question was appeared as we discovered function query_cache_send_result_to_client is called before real parsing of query, so at the moment of execution the query_cache is not...
by Peter Zaitsev | Aug 1, 2007 | Insight for DBAs
I finally found a time to publish Landscape of Transactional Storage Engines slides on MySQL Presentations page , this is the talk which we gave on OSCON 2007 and which talks about current state behavior and performance properties of Innodb, Falcon, PBXT and SolidDB...
by Peter Zaitsev | Jul 27, 2007 | Insight for DBAs
Working on large upgrade of MySQL 4.1 running Innodb to MySQL 5.0 and doing oprofile analyzes we found very interesting issue of buf_get_latched_pages_number being responsible for most CPU usage. It did not look right. The close look revealed this is the function...
by Peter Zaitsev | Jul 27, 2007 | Insight for DBAs
It is true you might be better of being unaware about problems, because in this case you might not run into them 🙂 Just couple of days ago Kaj Arno told me there are issues reported with SHOW PROFILE patch available in latest MySQL Community Edition and I’ve...
by Peter Zaitsev | Jul 26, 2007 | Percona Events
Interesting enough this year people at OSCON do not show to much interest in the MySQL, and Databases for that reason. Our talk comparing performance of MySQL Storage Engines had probably 20-30 people, Monty’s talk on MySQL Source Code had about same number, and...
by Peter Zaitsev | Jul 25, 2007 | Benchmarks
Listening to Josh Berkus presentation on OSCON today I decided to take a closer look at SpecJAppServer benchmarks results which were published by PostgreSQL recently and which as Josh Puts it “This publication shows that a properly tuned PostgreSQL is not only...
by Peter Zaitsev | Jul 24, 2007 | Insight for DBAs
Looking for documentation for read_rnd_buffer_size you would find descriptions such as “The read_rnd_buffer_size is used after a sort, when reading rows in sorted order. If you use many queries with ORDER BY, upping this can improve performance” which is...
by Peter Zaitsev | Jul 23, 2007 | Insight for Developers
I’ve already wrote a few times about various projects using Sphinx with MySQL for scalable Full Text Search applications. For example on BoardReader we’re using this combination to build search against over 1 billion of forum posts totaling over 1.5TB of...
by Maciej Dobrzanski | Jul 18, 2007 | Percona Software
Microslow patch has been there for some time, but only for earlier MySQL editions such as 4.1 and 5.0. Now it’s also available for the latest 5.1. Because MySQL went through a lot of internal changes, the patch had to be written from scratch. It introduces some...
by Peter Zaitsev | Jul 18, 2007 | Insight for DBAs
In my previous post I was a bit wrong giving Innodb some properties it does not have. In fact Innodb does not currently sort pages in their position order flushing them to disk. Pages to be flushed are instead identified by other means – LRU and pages which...
by Peter Zaitsev | Jul 17, 2007 | Insight for DBAs
How does Buffer Pool size affects Innodb Performance ? I always expected the effect to be positive, Innodb with large buffer pool to performing better. Including Recovery of course. I even blogged about it. It turns out it is not always the case. Last week I was...
by Peter Zaitsev | Jul 10, 2007 | Percona Events
Last time I was in Silicon Valley in April after MySQL Users Conference, this time I’m planning to spend July 30 – August 2nd in Silicon Valley after OSCON visiting friends and customers. If you’re located in Silicon Valley or San Francisco area and...
by Peter Zaitsev | Jul 9, 2007 | Percona Events
Let me announce ClickAider – another projects we were working on in stealth mode for last several Months. ClickAider is Hosted Web Statistics system but it tracks Clicks rather than page views as most web counters do. And by clicks I mean not just clicks on the...
by Peter Zaitsev | Jul 8, 2007 | Insight for DBAs
In my previous post I mentioned you might need to increase net_write_timeout to avoid connection being aborted and now I think I should have better explained that. MySQL uses a lot of different timeout variables at different stages. For example when connection is just...
by Peter Zaitsev | Jul 6, 2007 | Insight for Developers
We’re working with web site preparing for massive growth. To make sure it handles large data sets as part of the process we work on generation test database of significant size as testing your application on table with 1000 rows may well give you very dangerous...
by Peter Zaitsev | Jul 5, 2007 | Insight for Developers
What does working with large data sets in mySQL teach you ? Of course you have to learn a lot about query optimization, art of building summary tables and tricks of executing queries exactly as you want. I already wrote about development and configuration side of the...
