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exp document/document2009@document owner=document rows=y compress=y buffer=65536 feedback=100000 file=D:\document.dmp log=D:\document.log
exp whd/whd2009@whddb owner=whd rows=y compress=y buffer=65536 feedback=100000 file=D:\whd.dmp log=D:\whd.log
imp document/document2009@document fromuser=document touser=document rows=y commit=y buffer=65536 feedback=100000 file=D:\document.dmp log=D:\document.log
imp whd/whd2009@whddb fromuser=whd touser=whd rows=y commit=y buffer=65536 feedback=100000 file=D:\whd.dmp log=D:\whd.log
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select * from dba_DATA_FILES
exp whd/whd2009@whddb66 owner=whd rows=y compress=y buffer=65536 feedback=100000 file=D:\whd.dmp log=D:\whd.log
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sal>(select sal from emp where name="SMITH");
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