In many write-intensive workloads Innodb/XtraDB storage engines you may see hidden and dangerous debt being accumulated  unpurged transaction history which if not kept in check over time will cause serve performance regression or will take all free space and cause an outage. Lets talk about where it comes from and what can you do [&]

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http://www.percona.com/blog/2014/10/17/innodb-transaction-history-often-hides-dangerous-debt/