Database Management Reference Manual
Comparisons Across Sessions and Stamps : Change Management : Query the Session History for an Element or Attribute
Query the Session History for an Element or Attribute
Lets you query modification history for a given attribute; i.e. session numbers during which the attribute was modified.
Examples: 
Q HISTORY DIAM
Gives all sessions in which DIAM attribute was modified.
Note:
HISTORY is an array type pseudo-attribute, so that qualifying positions may be appended to query specific occurrences in the modification history. For example:

Q HISTORY[2] DIAM

gives second most recent session in which DIAM attribute was modified.
Note:
History records are restricted to a maximum of 120 sessions.
Command Syntax:
Q HISTORY attribute_name 
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