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MySQL Slave Lag (Delay) Explained And 7 Ways To Battle It


Posted by Artem Russakovskii on September 5th, 2008 in Databases, Programming

Updated: September 16th, 2012

http://forge.mysql.com/w/images/1/1e/Dolphin_Laptop_cropped-386x222.jpgSlave delay can be a nightmare. I battle it every day and know plenty of people who curse the serialization problem of replication. For those who are not familiar with it, replication on MySQL slaves runs commands in series – one by one, while the master may run them in parallel. This fact usually causes bottlenecks. Consider these 2 examples:

  • Between 1 and 100 UPDATE queries are constantly running on the master in parallel. If the slave IO is only fast enough to handle 50 of them without lagging, as soon as 51 start running, the slaves starts to lag.
  • A more common problem is when one query takes an hour to run (let's say, it's an UPDATE with a
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Must-Know People In The MySQL Field


Posted by Artem Russakovskii on March 18th, 2008 in Databases, Programming

Updated: April 8th, 2008

If you're serious about MySQL, it doesn't hurt to know the people closely tied to its development and maintenance as well as famous bloggers. Here's my ongoing list of people I consider important:

Peter Zaitsev – MySQL Performance Blog, former head of MySQL AB High Performance Group. His company Percona is available for consulting. He's a co-author of High Performance MySQL 2nd edition (great book).

Baron Schwartz – also know as Xaprb, Baron a co-author of High Performance MySQL 2nd edition and creator of innotop and Maatkit. Maatkit is simply brilliant, and so is Baron. Baron recently joined Peter Zaitsev at Percona.

Jeremy Zawodny – MySQL guru, works for Yahoo, and is considered a legend. He wrote mytop

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