Adam Witney <awitney(at)sgul(dot)ac(dot)uk> writes:
> If you mean by that, this:
> select * from mba_data_base where ctid = '(640792,12)';
> select * from mba_data_base where ctid = '(640799,1)';
> Then the data looks normal... Of course everything in between that is now
> blank.
The question is, can you tell whether any data is actually missing?
In the crash scenario I was describing, no committed data would be lost.
If these blocks went zero because of filesystem misfeasance, however,
you might have lost data ...
regards, tom lane