My Oracle Support Banner

Temporary Disk I/O Stalls; LCP Frag Watchdog : No progress on Table (Doc ID 1582813.1)

Last updated on MARCH 10, 2020

Applies to:

MySQL Cluster - Version 6.3 and later
Generic Linux


During periods with high load, for example while creating backups or executing bulk updates particularly if these involve large BLOBs, disk I/O activities are temporary stalling.

For performance critical I/O activities this may cause temporary errors and/or the data node to crash. Examples of performance critical I/O in MySQL Cluster are:


One sign of the issue - although not necessarily required - is 100% disk utilisation while nothing is written to or read from the disk, for example:



The more memory that is available on the server, the more likely this issue is to happen, so the issue may begin after installing more memory or upgrading to a new server with more memory available.


To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.