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Peter ZaitsevMySQL Has API to run Multiple Queries at once. This feature was designed mainly with saving network round trip in mind and got a little traction due to associated security risks and not significant gains in most cases. What would make MySQL Multiple Queries API more usable ?
HighLoad.RU is the conference focused on Building High Performance Systems and has speakers from most of top Russian Internet companies. It is taking place in Moscow, Russia 24-25 of September and you should know a bit of Russian to attend 🙂 The conference has some international flavor though there are few people coming from other […]
We have yet another opening at MySQL Performance Blog. We’re looking for Intern position (with limited compensation) to work on project of MySQL Performance research and analysis, developing and running benchmarks under our guidance, writing WhitePapers and articles. We feel this would be perfect part time position for the Computer Science student interested in High […]
During last one and a half year we had pretty good track record with MySQL Performance Blog – there were times when site was slow (especially when backup was running) but I do not remember significant downtime, until today we went down for few hours. All this time the site was running on dedicated server […]
As you may already have seen announcement by Baron we’re working on major rewrite of High Performance MySQL book – the most famous book about MySQL Performance on the market… which is getting old though. We’ve been slowly working on the book for over half a year now and were later joined by Arjen Lentz […]
I took the same table as I used for MySQL Group by Performance Tests to see how much MySQL can sort 1.000.000 rows, or rather return top 10 rows from sorted result set which is the most typical way sorting is used in practice. I tested full table scan of the table completes in 0.22 […]
Jan has a good article about finding the row matching some value in the group: This is one illustration of group by limitations in SQL language which is not offset by any MySQL specific extensions,yet As you can see if you want to get one row from the group which is sorted some way you […]
As you might know while running GROUP BY and some other kinds of queries MySQL needs to create temporary tables, which can be created in memory, using MEMORY storage engine or can be created on disk as MYISAM tables. Which one will be used depends on the allowed tmp_table_size and also by the data which […]
I noticed today if you go to Yahoo.com and type MySQL to Search field it gives you suggestions for MySQL, which are: * loading javascript arrays with mysql data * mysql performance blog * mysql download * mysql administrator download * mysql front download It may not be best search suggestions but it is cool […]
Sheeri just posted a great post putting a different view on recent MySQL Community Announcements. This however raises very interesting point what MySQL Community really needs ? I think the problem is there are no single set of needs for Community which can be maintained within single version. I see at least two set of […]
I start to see applications being built utilizing VIEWs functionality which appeared in MySQL 5.0 and quite frequently VIEWs are used to help in writing the queries – to keep queries simple without really thinking how it affects server performance. Even worse than that – looking at the short table which just gets single row […]
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 post my thoughts on this matter. First I was surprised article […]
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 one for Russian Internet Market. So I […]
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 MySQL is out of more creative solutions […]
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 Storage Engines.
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 which is used to compute number of latched pages in Innodb Buffer Pool, […]
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 been troubleshooting customer affected by one of […]
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 as Monty told me he never had so few people on […]
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 as fast or faster than MySQL, but almost as fast as Oracle (since […]
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 cool but it does not really tell you how exactly read_rnd_buffer_size works as well as which […]