Details
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Bug
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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10.3.27, 10.5.10
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None
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None
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Linux CentOS 8
Description
Sometimes file_summary_by_instance table of performance_schema reports insanely large values.
For example, when I restart the server (to reset all stats) everything seems to work fine, but suddenly after a few minutes or hours I get something like io usage of more than a few month or even years!
I attached a query and it's result that just a few minutes after a restart on a development machine, it shows that 3 internal tables and a wordpress table are using more than 4 months of io usage! As COUNT_STAR column shows, I just refreshed a just-installed WordPress page for a few times and suddenly this happened. Also I saw this issue on a Stack Overflow question a few days ago too, but I can't find a link to it.
This is a handy important feature of MariaDB for both finding bottlenecks and also finding abusive users in multi-user environments. It's so sad that such a good feature is not only underrated, but also is buggy.
I checked this with default setting on both 10.3.27 and 10.5.10 on CentOS, both versions have same problem.
Please let me know if there is a need for more information.