I have a request from one of our developers to create two new sequences on
the DUAL table.

This seems like a bad idea to me.   I've never had such a request in the
past.   I asked for clarification on why this is needed and I didn't get a
lot of details yet.

Is this something that is standard operating procedure?   My understanding
that interfacing with the DUAL table is usually inviting poor performance.
Plus, I don't like to mess around with system tables, in general.

Under what circumstances would it be justified to create sequences on the
DUAL table?   Should I just flat-out refuse this request and if so, why?

Thanks,

Cherie Machler
Oracle DBA
Gelco Information Network

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