Oracle Database 11 g - Online Public Access Catalog

CHAPTER 3 ■ DATABASE ADMINISTRATION 145Now that we made sure the emp table in the two databases diverges, it’s time to run thecreate_comparison procedure to trap the data divergence between the two tables.3. Create a comparison for the hr.emp table on the two databases by running thecreate_comparison procedure, as shown here:SQL> begin2 dbms_comparison.create_comparison(3 comparison_name => 'compare1',4 schema_name => 'scott',5 object_name => 'emp',6 dblink_name => 'tenner');7* end;SQL> /PL/SQL procedure successfully completed.SQL>4. Execute the compare function to see whether the create_comparison procedure hasfound any differences between the two tables.SQL> declare2 consistent boolean;3 scan_info dbms_comparison.comparison_type;4 begin5 consistent := dbms_comparison.compare(6 comparison_name => 'comp1',7 scan_info => scan_info,8 perform_row_dif => TRUE);9 DBMS_OUTPUT.PUT_LINE('Scan ID: '||scan_info.scan_id);10 IF consistent=TRUE THEN11 DBMS_OUTPUT.PUT_LINE('No differences were found.');12 ELSE13 DBMS_OUTPUT.PUT_LINE('Differences were found.');14 end if;15* end;SQL> /Scan ID: 4Differences were found.PL/SQL procedure successfully completed.SQL>5. The compare function uses the scan ID 4 and prints the statement “Differences were found.”6. Since there are differences, you can run the following query, which uses the viewsDBA_COMPARISON and DBA_COMPARISON_SCAN_SUMMARY to tell us how many differences werefound during the table comparison: