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UNDO Space: used way bigger than total
Posted by: Thomas Waibel-BGo
Date: February 18, 2018 04:12AM

Hi,

we experienced - during a mass delete action - a undo space full.

Since then our monitoring barks at us with crazy big usage percentages.

---
ndb14 undo space usage too high: PROBLEM
Undo space usage (node id 3): 156180628937.61 %
---

So looking at the checked value shows:
mysql> select total,used, used/total as percentage from ndbinfo.logspaces where log_type='DD-UNDO' and node_id = "3";
+-------------+----------------------+-----------------+
| total | used | percentage |
+-------------+----------------------+-----------------+
| 11811160064 | 18446744071955687784 | 1561806289.3061 |
+-------------+----------------------+-----------------+
1 row in set (0.02 sec)

mysql>

There is either some magic going on - or a overrun of a variable...

Best regards

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February 18, 2018 04:12AM


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