select * from tab;
desc <表名>;
select index_name from user_indexes;
select TABLE_NAME, INDEX_NAME, column_name from user_ind_columns where TABLE_NAME='<表名>';
select username from user_users;
select * from NLS_DATABASE_PARAMETERS where PARAMETER = 'NLS_NCHAR_CHARACTERSET';
exp "<username>/<password> file=exp01.dmp tables=(JOB, TOKUIDB, TOUR_JOHO)" imp "<username>/<password> file=exp01.dmp tables=(JOB, TOKUIDB, TOUR_JOHO)"