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I don't think it's possible to do a direct clone because the DB would still remain as 11g. Other options I can think of:
Export from 11g import to 10g
Clone and then downgrade
It would depend on how large your database is, or if you could take a cut down part of it to use instead of the whole DB.
db size is small. but i want to use only database cloning. Is it possible
Define what you mean by "database cloning". My understanding is that there are many ways to clone a database; manually, using RMAN, using SAN based technology, etc. Which one are you referring to?
By definition a clone is an exact copy, so if you clone your 11g DB you will have another 11g DB. The only way to make it 10g is to change it in some way. Downgrade, for example.
Have you already read through the Oracle docs?
I very much doubt RMAN will allow you to downgrade the DB while duplicating it.
ok let me try