Comment 3 for bug 1457641

Hello Dave,

There are two issues here.

First:
The --alter option must not include the "ALTER TABLE <table>" part. Change that to: --alter="modify email varchar(200)"

Second:
There is a known and nasty bug that causes the segmentation fault when the alter fails.
https://bugs.launchpad.net/percona-toolkit/+bug/1446928

This is already fixed and will be included in the next release, but a patch is available in the first comment of the issue report in the above link.

I'll include it in this comment for your convenience.

I'll mark this report as a duplicate of the previous one to avoid confusion.

Regards!