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Pl define what you mean by "very large" and "fraction".
Cloning the entire database periodically is an option. See MOS Doc 562556.1 (How to Manually Clone a Database to Another Node). Exp/Imp has already been suggested. Using Streams may also be an option - http://download.oracle.com/docs/cd/B10501_01/server.920/a96571/strmover.htm
Its got very large tables, and the application only updates a fraction of it. import/export is not an option. thxWhat about Transportable Tablespaces ?
You have just to export / import the metadata which describe the Tablespaces and, copy the corresponding datafiles. The set of Tablespaces must be self-contained and put in read-only during the metadata export & datafile copy. It can be much faster than export/import in Owner or Full mode.
Please, find enclosed a link about this method which is available in Oracle 9i:
Hope this help.
I have not tired this, but I wonder if using the query parameter would work. Something like
query=schema.table:'minus select * from schema.table as of scn=TO_CHAR(LAST_SCN_UPDATE)
Let's say your latest backup is of scn 123456 and the current scn is 234567, You would use:
query=schema.table:'minus select * from schema.table as of scn=TO_CHAR(123456)
The next time you would use 234567, etc. I think flashback uses undo, so you would need lots of undo, but if that is not a problem, then maybe it would work.
Again, I have not tried this, so I would recommend trying it on a small test table to see what happens. The query parameter may not accept this type of query, but I think it would.
I had some time so I tried it. Here is what I did.
1. got my current scn number;
select dbms_flashback.get_system_change_number from dual;
2. added a row to the scott.emp table
insert into scott.emp values (123,'dean', 'chief', 000, sysdate, 12567, 12566, 12);
select count(*) from scott.emp;
3. ran this expdp command
expdp system/manager tables=scott.emp directory=dpump_dir dumpfile=snew.dmp query=scott.emp:'"minus select * from scott.emp as of scn(596018)"'
. . exported "SCOTT"."EMP" 8.039 KB 1 rows
So, it only exported 1 row where there were 15 rows in the table. I then ran the normal import and looked at the table. there were 2 columns with the ename of dean. I think this should work if you have enough undo to handle the flashback query.