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However, if some of your applications use pessimistic locking, which will hold locks on rows for relatively long periods of time, or if there is any application (such as a batch process) that might lock rows for a long period of time (more than a second or two is considered long!), then you should consider using a SELECT FOR UPDATE NOWAIT instead to verify the row was not changed, and lock it immediately prior to the UPDATE to avoid getting blocked by another session..

Using the Flashback Data Archive imposes certain limitations on the type of DDL statements you can issue. You can t issue the following types of DDL statements on a table that you enabled for a Flashback Data Archive: An ALTER TABLE statement that drops, renames, or modifies a table column An ALTER TABLE statement that performs partition operations A DROP TABLE or a TRUNCATE TABLE statement A RENAME TABLE statement

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You can use a Flashback Data Archive for querying historical data, auditing, as well as recovering from data errors. The following examples illustrate how you can utilize the Flashback Data Archive in different situations.

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There are many methods of implementing optimistic concurrency control. We ve discussed one whereby the application will store all of the before images of the row in the application itself. In the following sections, we ll explore two others, namely: Using a special column that is maintained by a database trigger or application code to tell us the version of the record Using a checksum or hash that was computed using the original data

Using the AS_OF clause in a query, you can access the historical data stored in the Flashback Data Archive, as shown in the following query: SQL> select transaction_number, doctor_name, count from patient_info as of timestamp to_timestamp ('2009-01-01 00:00:00', 'YYYY-MM-DD HH23:MI:SS'); You can also use the AS_OF clause to recover from logical errors. In the following example, an employee by the name of Zlotkey has a current income of $10,500, as shown by the following query: SQL> SELECT username, salary FROM HR.EMPLOYEES WHERE last_name='Zlotkey'; SALARY ------10500 SQL> The human resources department makes a wrong update to the EMPLOYEES table, when it raises Zlotkey s salary by $50,000 instead of $500, as shown here: SQL> UPDATE hr.employees SET salary=salary+50000 WHERE last_name='Zlotkey'; 1 row updated. SQL> commit; Commit complete. SQL> Suppose you learn about the wrong update about two hours after it was made. Simply issue the following statement using the AS_OF clause to correct the error:

Now, if we inspect the contents of the LOB_DEMO table after running SQLLDR, we will discover the following: ops$tkyte@ORA10G> select owner, time_stamp, filename, dbms_lob.getlength(data) 2 from lob_demo 3 / OWNER -------tkyte tkyte tkyte tkyte tkyte tkyte tkyte tkyte tkyte tkyte TIME_STAM --------17-JUN-05 16-JUL-05 16-JUL-05 16-JUL-05 16-JUL-05 16-JUL-05 28-APR-05 16-JUL-05 16-JUL-05 16-JUL-05 FILENAME DBMS_LOB.GETLENGTH(DATA) -------------- -----------------------classes12.zip 1220342 foo.sql 10 t.ctl 875 testa.sql 491 testb.sql 283 test.sh 231 test.sql 235 t.log 0 uselast.sql 1292 userbs.sql 909

SQL> update hr.employees set salary = (select salary from hr.employees as of timestamp (systimestamp - interval '120' minute); where last_name='Zlotkey') where last_name='Zlotkey'; 1 row updated. SQL> commit; Commit complete. SQL> Note that at no time do you have to access or query the history table that the database maintains to track the transactional changes to a table s data. The AS_OF clause ensures that the database looks up the relevant information in the history table that supports the Flashback Data Archive. The clause SYSTIMESTAMP INTERVAL '120' MINUTE will retrieve the values from two hours ago. You can also specify seconds, days, and months in this clause, as shown in the following examples: systimestamp interval '60' second systimestamp interval '7' day systimestamp interval '12' month

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