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As an example, consider the following C# class: public class A { public int GetAge(string theName) { // .. } } The signature for the GetAge method is int f(string theName) There are three things missing from the signature: The type to which the method belongs: Signatures describe methods outside the context of classes and interfaces, so they don t specify a class or interface The method s access qualifier: The signature doesn t have an access qualifier (eg, public or private), because qualifiers don t describe the method, but rather the method s accessibility, which is a class-level property The method name: The signature doesn t have any particular method name, because signatures are abstract: They don t identify a concrete method A given signature can apply to any number of methods.

This section presents a simple example to show the functionality of the DBMS_REPAIR package. The first step is to create a pair of tables called repair_table and orphan_key_table to hold the corrupt blocks, if any are found during the investigation. You use the procedure ADMIN_TABLES to create the repair table, whose default name is repair_table. Listing 24-8 shows the execution of the ADMIN_TABLES procedure. Listing 24-8. Using the DBMS_REPAIR Package to Detect Block Corruption SQL> BEGIN 2 DBMS_REPAIR.ADMIN_TABLES ( 3 TABLE_NAME => 'REPAIR_TABLE', 4 TABLE_TYPE => dbms_repair.repair_table, 5 ACTION => dbms_repair.create_action, 6 TABLESPACE => 'USERS'); 7 END; 8* / PL/SQL procedure successfully completed. SQL> BEGIN 2 DBMS_REPAIR.ADMIN_TABLES ( 3 TABLE_NAME => 'ORPHAN_KEY_TABLE', 4 TABLE_TYPE => dbms_repair.orphan_table, 5 ACTION => dbms_repair.create_action, 6 TABLESPACE => 'USERS'); 7 END; 8*/ PL/SQL procedure successfully completed. SQL> Listing 24-9 shows the columns of the repair_table you just created. The table gives you the object_id and the block_id for the corrupt block. It also gives you a description of the corruption and the repair that fixed the corrupt block. Listing 24-9. Describing the repair_table SQL> DESC REPAIR_TABLE Name --------------------OBJECT_ID TABLESPACE_ID RELATIVE_FILE_ID

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Now, when all is said and done, tables A and B will each have a row with the value 0 in it. If there was some serial ordering of the transactions, we could not possibly have both tables containing the value 0 in them. If session 1 executed before session 2, then table B would have a row with the value 1 in it. If session 2 executed before session 1, then table A would have a row with the value 1 in it. As executed here, however, both tables will have rows with a value of 0. They just executed as if they were the only transaction in the database at that point in time. No matter how many times session 1 queries table B, the count will be the count that was committed in the database at time T1. Likewise, no matter how many times session 2 queries table A, the count will be the same as it was at time T2.

BLOCK_ID CORRUPT_TYPE SCHEMA_NAME OBJECT_NAME BASEOBJECT_NAME PARTITION_NAME CORRUPT_DESCRIPTION REPAIR_DESCRIPTION MARKED_CORRUPT CHECK_TIMESTAMP FIX_TIMESTAMP REFORMAT_TIMESTAMP SQL> After you create the two tables, repair_table and orphan_keys_table, it s time to check for block corruption using the CHECK_OBJECT procedure, as shown in Listing 24-10. Listing 24-10. Using the DBMS_REPAIR.CHECK_OBJECT Procedure SQL> DECLARE num_corrupt INTEGER; 2 BEGIN 3 num_corrupt := 0; 4 DBMS_REPAIR.CHECK_OBJECT( 5 schema_name => 'HR', 6 object_name => 'EMPLOYEES', 7 repair_table_name => 'REPAIR_TABLE', 8 corrupt_count => num_corrupt); 9 END 10 / PL/SQL procedure successfully completed. SQL>

If the CHECK_OBJECT procedure populates any rows into your repair table (repair_table), then it s time to fix it using the procedure FIX_CORRUPT_BLOCKS. Listing 24-11 shows how to use the FIX_CORRUPT_BLOCKS procedure. Once you run it, you use the SKIP_CORRUPT_BLOCKS procedure so Oracle can skip the corrupted blocks. Listing 24-11. Using the DBMS_REPAIR.FIX_CORRUPT_BLOCKS Procedure SQL> DECLARE num_fix INTEGER; 2 BEGIN 3 num_fix := 0; 4 DBMS_REPAIR.FIX_CORRUPT_BLOCKS( 5 schema_name => 'HR', 6 object_name => 'EMPLOYEES', 7 object_type => dbms_repair.table_object, 8 repair_table_name => 'REPAIR_TABLE', 9 fix_count => num_fix); 10 END; PL/SQL procedure successfully completed. SQL>

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