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To pack or not to pack – MyISAM Key compression

 | May 13, 2006 |  Posted In: Insight for DBAs

MyISAM storage engine has key compression which makes its indexes much smaller, allowing better fit in caches and so improving performance dramatically. Actually packed indexes not a bit longer rows is frequent reason of MyISAM performing better than Innodb. In this article I’ll get in a bit more details about packed keys and performance implications […]

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Mess with innodb_thread_concurrency

 | May 12, 2006 |  Posted In: Insight for DBAs

In MySQL 5.0.19 the meaning of innodb_thread_concurrency variable was changed (yeah, again). Now innodb_thread_concurrency=0 means unlimitied count of concurrent threads inside InnoDB. It’s logical, but there was long way. In MySQL versions below 5.0.8 for unlimited threads you had to set innodb_thread_concurrency over 500 (and default value for innodb_thread_concurrency was 8 ). Starting with MySQL […]

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Innodb Fuzzy checkpointing woes

 | May 10, 2006 |  Posted In: Insight for DBAs

As you might know Innodb storage engines uses Fuzzy Checkpointing technique as part of it recovery strategy.  It is very nice approach which means database never needs to “stall” to perform total modified pages flush but instead flushing of dirty pages happens gradually in small chunks so database load is very even. This works great […]

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Descending indexing and loose index scan

 | May 9, 2006 |  Posted In: Insight for Developers

Comments to my previous posts, especially this one by Gokhan inspired me to write a bit about descending indexes and about loose index scan, or what Gokhan calls “better range” support. None of these are actially related to Innodb tables in general – these are features MySQL should get for all storage engines at some […]

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My Innodb Feature wishes

 | May 4, 2006 |  Posted In: Insight for Developers

At Users Conference Heikki did good presentation about Innodb planned features. I did not see some of big and tiny wishes listed so I was making notes. Here is what I’d like to see Packed indexes. In many cases then difference in Performace with MyISAM and Innodb is huge for read only workload it is […]

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Group commit and real fsync

 | May 3, 2006 |  Posted In: Insight for DBAs

During the recent months I’ve seen few cases of customers upgrading to MySQL 5.0 and having serious performance slow downs, up to 10 times in certain cases. What was the most surprising for them is the problem was hardware and even OS specific – it could show up with one OS version but not in […]

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Site goes lives

 | May 3, 2006 |  Posted In: Events and Announcements

Numerous talks at MySQL Users Conference and a lot of people asking me for my presentations motivated me to speed up launching of this site. I hope it will also motivate me to blog more frequently about performance as blog name implies. If you’re looking for presentations they are here. All of mine presentations which […]

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