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Displaying posts with tag: purge lag (reset)
Runaway history list

On one of the clusters at Spil we noticed a sudden increase in the length of the history list and a steep increase in the ibdata file in the MySQL directory.
I did post a bit about this topic earlier regarding MySQL 5.5 but this cluster is still running 5.1 and unfortunately 5.1 does not have the same configurable options to influence the purging of the undo log…

Now I did find a couple of great resources that explain the purge lag problem into detail: Pythian, DimitriK and …

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MySQL 5.5 upgrade blues (part one)

At the company I work for we are still running Percona Server 5.1 in production and are slowly heading towards a Percona Server 5.5 rollout. It did take a lot of preparation in the past few months (write a my.cnf conversion script for example) and a lot of testing. A couple of machines already have been upgraded this week to 5.5 to compare performance and stability. So far the machines proved to be stable enough to keep them on 5.5 and even better: we already see a couple of benefits! However, the title wouldn’t have been blues if everything would have been a breeze, right?

First problem we ran into was that our Cacti templates broke due to the changed InnoDB status output. So I headed towards the Cacti templates and looked in the issue tracker if the issue was already known. Apparently it was already known, but unfortunately not fixed yet. …

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