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The second method, referred to as optimistic locking, defers all locking up to the point right before the update is performed In other words, we will modify the information on the screen without a lock being acquired We are optimistic that the data will not be changed by some other user; hence we wait until the very last moment to find out if we are right This locking method works in all environments, but it does increase the probability that a user performing an update will lose That is, when that user goes to update her row, she finds that the data has been modified, and she has to start over One popular implementation of optimistic locking is to keep the old and new values in the application, and upon updating the data, use an update like this: Update table Set column1 = :new_column1, column2 = :new_column2, ....

Purge all data older than a week from an archive: SQL> ALTER FLASHBACK ARCHIVE flash1 PURGE BEFORE TIMESTAMP (SYSTIMESTAMP INTERVAL '1' DAY);

You can remove a Flashback Data Archive with the following statement: SQL> DROP FLASHBACK ARCHIVE flash1; The previous statement will only remove the Flashback Data Archive. The tablespace that hosts the archive remains intact, since that tablespace may contain other objects besides the Flashback Data Archive.

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Where primary_key = :primary_key And decode( column1, :old_column1, 1 ) = 1 And decode( column2, :old_column2, 1 ) = 1 .. Here, we are optimistic that the data doesn t get changed In this case, if our update updates one row, we got lucky; the data didn t change between the time we read it and the time we got around to submitting the update If we update zero rows, we lose; someone else changed the data and now we must figure out what we want to do to continue in the application.

You can use the following views to find out details about the data stored in the Flashback Data Archive: DBA_FLASHBACK_ARCHIVE: Shows details about the Flashback Data Archive DBA_FLASHBACK_ARCHIVE_TS: Shows information about the tablespaces hosting the Flashback Data Archive DBA_FLASHBACK_ARCHIVE_TABLES: Shows information about the tables that are enabled for flashback data archiving

You can only turn archiving on at the table level. You can t turn archiving on for the entire database. By default, the database doesn t archive any changes. You can enable flashback data archiving for a table by specifying the FLASHBACK ARCHIVE clause when you create the table, as shown here: SQL> CREATE TABLE test1 (name empno salary FLASHBACK ARCHIVE; VARCHAR2(30), NUMBER(4) NOT NULL, NUMBER)

Should we make the end user re-key the transaction after querying the new values for the row (potentially causing the user frustration, as there is a chance the row will have changed yet again) Should we try to merge the values of the two updates by performing update conflict-resolution based on business rules (lots of code) The preceding UPDATE will, in fact, avoid a lost update, but it does stand a chance of being blocked, hanging while it waits for an UPDATE of that row by another session to complete If all of your applications use optimistic locking, then using a straight UPDATE is generally OK since rows are locked for a very short duration as updates are applied and committed.

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In the previous example, I don t specify a name for the Flashback Data Archive. The database stores the historical data in the default Flashback Data Archive as a result. I can specify a particular Flashback Data Archive by adding the name for the archive, as shown in the following example: SQL> CREATE TABLE test1 (name VARCHAR2(30), empno NUMBER(4) NOT NULL, salary NUMBER) FLASHBACK ARCHIVE flash1; You can also turn flashback data archiving on for an existing table by issuing the ALTER TABLE statement, as shown here: SQL> ALTER TABLE employee FLASHBACK ARCHIVE; To disable flashback data archiving for a table, issue the following statement: SQL> ALTER TABLE employee NO FLASHBACK ARCHIVE;

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