Answer / swapna

Export the higher version data using lower version Export
utility and import it to the lower version DB.

Answer / shai

Here's the answer straight from the Oracle Utilities guide:

Example:

You can create an Oracle release 7 export file from an
Oracle8 database by running Oracle release 7 Export against
an Oracle8 server. To do so, however, the user SYS must
first run the CATEXP7.SQL script, which creates the export
views that make the database look, to Export, like an
Oracle release 7 database.
Note: An Oracle8 Export requires that the CATEXP.SQL script
is run against the database before performing the Export.
CATEXP.SQL is usually run automatically when the user SYS
runs CATALOG.SQL to create the necessary views.
CATEXP7.SQL, however, is not run automatically and must be
executed manually. CATEXP7.SQL and CATEXP.SQL can be run in
any order; after one of these scripts has been run, it need
not be run again.

So, in order to import the data from 8.0 into 7.3, you must
create the export dmp file using the Oracle 7 release of
Export. Then when you use the Oracle 7 release of Import it
will understand the contents of the dmp file. If you tried
to just export from your 8.0 version and directly import
that using 7, it would fail.

Answer / sanjay

We can use the exp utility which was introduced in oracle 7 to export and we can use the imp utility to import the data.Because oracle always support the lower versions in the higher version.

Answer / santu

it 'll show datafile block header not readable

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