There are two approaches to back up a table:
1: Back up a table under the exsiting schema by creating a new table with tablename_bck nameing convention.
Simply run the following query under the current schema :
Creat table tablename_bck as select * from <tablename>;
2: Export the table to a dump file.
Open a command line tool .Use Oracle utility tool expdp
expdp sample/samplepwd@db10g tables=EMP,DEPT directory=TEST_DIR dumpfile=EMP_DEPT.dmp logfile=expdpEMP_DEPT.log
3: Import the dump file into database.
impdp sample/samplepwd@db10g tables=EMP,DEPT directory=TEST_DIR dumpfile=EMP_DEPT.dmp logfile=impdpEMP_DEPT.log
I would also like to note about the old utility tool exp and imp.
The syntax is slightly different. Without creating a reusable directory, in exp and imp, you have to specify explicitly of the directory where your dump file is saved to.
exp sample/samplepwd@db10g tables=EMP,DEPT file="C:\EMP_DEPT.dmp" log="C:\impdpEMP_DEPT.log"
imp sample/samplepwd@db10g tables=EMP,DEPT file="C:\EMP_DEPT.dmp" log="C:\impdpEMP_DEPT.log"
Error: ORA-39143: dump file “M:\SAMPLE.dmp” may be an original export dump file
The above problem happened whenever you try to use the Import Data Pump client (impdp) to import a dumpfile that was created with the original Export client (exp).