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Aligning IO on a hard disk RAID – the Theory

 | June 9, 2011 |  Posted In: MySQL

Now that flash storage is becoming more popular, IO alignment question keeps popping up more often than it used to when all we had were rotating hard disk drives. I think the reason is very simple – when systems only had one bearing hard disk drive (HDD) as in RAID1 or one disk drive at […]

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UDF -vs- MySQL Stored Function

 | September 6, 2010 |  Posted In: MySQL

Few days ago I was working on a case where we needed to modify a lot of data before pushing it to sphinx – MySQL did not have a function to do the thing so I thought I’ll write MySQL Stored Function and we’ll be good to go. It worked! But not so well really […]

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Using MMM to ALTER huge tables

 | March 27, 2008 |  Posted In: Insight for DBAs

Few months ago, I wrote about a faster way to do certain table modifications online. It works well when all you want is to remove auto_increment or change ENUM values. When it comes to changes that really require table to be rebuilt – adding/dropping columns or indexes, changing data type, converting data to different character […]

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