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# Configuring Historical Sessions Using an Oracle Platform

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Oracle9i Database Server (or later) automatically maintains historical versions of objects and extends SQL with an `AS_OF` clause used to query this historical data. Oracle refers to these as flashback queries.

If you configure your `Session` with an `OraclePlatform` (see "Configuring a Relational Database Platform at the Session Level") for Oracle9i Database Server (or later), you can query the historical versions of objects automatically maintained by Oracle Database.

No further session configuration is required.

For more information, see the following:

- "Acquiring a Historical Session"

- "Historical Queries".