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zz$snap is the zztat snapshot table. It contains an entry for every snapshot taken.

It has the following columns:

Column Name Data Type Description
zz$db number Database DBID from zz$db.
snap# number Snapshot number.
metric varchar2 Metric name the snapshot is for, from zz$metric
begin_time timestamp Timestamp the snapshot started, in UTC.
end_time timestamp Timestamp the snapshot completed, in UTC.