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It then reads the backups and collects the necessary data blocks in memory buffers, and it may use an older backup if it finds that the most recent backup contains corrupt data blocks RMAN then starts and manages the BMR session, reading any necessary archived redo logs from the backed-up archived logs The RECOVER BLOCK command always results in a complete recovery; you can t perform a PITR using this command Anytime you run a command such as ANALYZE or DBVERIFY (dbv), for example, the database adds rows to the V$DATABASE_BLOCK_CORRUPTION view regarding any blocks that it marks corrupt There can be two types of corrupt blocks: physical corruption and logical corruption A physically corrupted block remains unrecognizable to the database, whereas the database can recognize a logically corrupt data block, but the contents of the block are logically inconsistent.

On line 8, we create a BFILE object Note how we use DIR1 in uppercase this is key, as we will see in a moment This is because we are passing to BFILENAME() the name of an object, not the object itself Therefore, we must ensure the name matches the case Oracle has stored for this object On line 9, we open the LOB This will allow us to read it..

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Block media recovery can repair only physically corrupted data blocks but not the logically corrupted blocks The previous example showed how to use RMAN to recover a single corrupt block You can also recover multiple corrupt blocks using the same command, but if you have multiple corrupt blocks and need to recover all of them, you can use a slightly different technique You need to follow these steps to enable RMAN to automatically recover all blocks listed in the V$DATABASE_BLOCK_ CORRUPTION view: 1 Issue the following SQL statement to determine how many corrupt blocks exist in the database: SQL> SELECT * FROM V$DATABASE_BLOCK_CORRUPTION; 2 Next, start RMAN, connect to the target database, and issue the following command: RMAN> RECOVER CORRUPTION LIST; RMAN will automatically recover all blocks marked corrupt in the target database and also remove them from the V$DATABASE_BLOCK_CORRUPTION view.

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You can therefore check the success of the recovery by querying this view after RMAN completes its recovery If you think you have extensive database block corruption and you aren t sure whether the preceding method will successfully recover the data, the best course of action is to first get in touch with Oracle Worldwide Support, which has access to specialized tools that can help you extract data from corrupt data blocks Oracle may charge you extra for these services, but if your data is critical, it may be well worth the expense..

On lines 11 and 12, we load the entire contents of the operating system file /tmp/ test.txt into the LOB locator we just inserted. We use DBMS_LOB.GETLENGTH() to tell the LOADFROMFILE() routine how many bytes of the BFILE to load (all of them). Lastly, on line 14, we close the BFILE we opened, and the CLOB is loaded. If we had attempted to use dir1 instead of DIR1 in the preceding example, we would have encountered the following error: ops$tkyte@ORA10G> declare ... 6 returning theclob into l_clob; 7 8 l_bfile := bfilename( 'dir1', 'test.txt' ); 9 dbms_lob.fileopen( l_bfile ); ... 15 end; 16 / declare * ERROR at line 1: ORA-22285: non-existent directory or file for FILEOPEN operation ORA-06512: at "SYS.DBMS_LOB", line 523 ORA-06512: at line 9 This is because the directory dir1 does not exist DIR1 does. If you prefer to use directory names in mixed case, you should use quoted identifiers when creating them as we did for dir2. This will allow you to write code as shown here: ops$tkyte@ORA10G> declare 2 l_clob clob; 3 l_bfile bfile; 4 begin 5 insert into demo values ( 1, empty_clob() ) 6 returning theclob into l_clob; 7 8 l_bfile := bfilename( 'dir2', 'test.txt' ); 9 dbms_lob.fileopen( l_bfile ); 10 11 dbms_lob.loadfromfile( l_clob, l_bfile, 12 dbms_lob.getlength( l_bfile ) ); 13 14 dbms_lob.fileclose( l_bfile ); 15 end; 16 / PL/SQL procedure successfully completed. There are methods other than the load from file routines by which you can populate a LOB using PL/SQL. Using DBMS_LOB and its supplied routines is by far the easiest if you are going to load the entire file. If you need to process the contents of the file while loading it,

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