Tom Lane wrote:
It's removing potentially-important data without any notice or recourse to the user. There seems to be a contingent around here that thinks that as soon as xmin is older than GlobalXmin it is no longer of interest to anyone, but I have lost count of how often I have found it invaluable for forensic purposes. I have resisted having VACUUM freeze tuples before they've reached a quite-respectable age, and I object to having CLUSTER do it either.
How about freezing anything older than vacuum_freeze_min_age, just like VACUUM does?
I could maybe accept a CLUSTER FREEZE option to do this, but that's not what's in the patch.
I wouldn't like to add more options to CLUSTER, people are already confused about the similar VACUUM options.
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