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You ll find that an update of an unindexed column not only executes much faster, it also tends to generate significantly less undo than an update of an indexed column For example, we ll create a table with two columns, both containing the same information, and index one of them: ops$tkyte%ORA11GR2> create table t 2 as 3 select object_name unindexed, 4 object_name indexed 5 from all_objects.

The simplicity of a leap year is appealing It s a year in which an extra day is added to the calendar in order to synchronize it with the earthly seasons However, for a leap year to be even somewhat effective, the calendar in question needs to approximate the duration of one earthly trip around the sun Before the idea of the leap year came along and the Greek Sosigenes incorporated it into the Julian calendar, synchronization of the seasons with the calendars of the time occurred via the addition of varying number of days to the different calendars of the times Revelry, festivities, and celebrations often marked the extra days Effectively, time stood still from the calendar perspective but not necessarily so from the perspective of creditors and debtors.

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6 / Table created. ops$tkyte%ORA11GR2> create index t_idx on t(indexed); Index created. ops$tkyte%ORA11GR2> exec dbms_stats.gather_table_stats(user,'T'); PL/SQL procedure successfully completed. Now we ll update the table, first updating the unindexed column and then the indexed column. We ll need a new V$ query to measure the amount of undo we ve generated in each case. The following query accomplishes this for us. It works by getting our session ID (SID) from V$MYSTAT, using that to find our record in the V$SESSION view, and retrieving the transaction address (TADDR). It uses the TADDR to pull up our V$TRANSACTION record (if any) and selects the USED_UBLK column the number of used undo blocks. Since we currently are not in a transaction, we expect it to return 0 rows right now: ops$tkyte%ORA11GR2> update t set unindexed = lower(unindexed); 72077 rows updated. ops$tkyte%ORA11GR2> select 2 from v$transaction 3 where addr = (select 4 from 5 where 6 7 8 9 ) 10 / USED_UBLK ---------1214 ops$tkyte%ORA11GR2> commit; Commit complete. That UPDATE used 1,214 blocks to store its undo. The commit would free that up, or release it, so if we rerun the query against V$TRANSACTION, it would once again show us no rows selected. When we update the same data only indexed this time we ll observe the following: ops$tkyte%ORA11GR2> update t set indexed = lower(indexed); 72077 rows updated. ops$tkyte%ORA11GR2> select 2 from v$transaction 3 where addr = (select 4 from 5 where 6 7 8 9 ) used_ublk taddr v$session sid = (select sid from v$mystat where rownum = 1 ) used_ublk taddr v$session sid = (select sid from v$mystat where rownum = 1 )

The UndoableBase class does the majority of the work to support the undo functionality. However, BusinessBase does include some methods that allow an editable object to participate in the undo process. In particular, it is BusinessBase that implements ISupportUndo, and so it is BusinessBase that implements methods such as BeginEdit(). These methods are Public to enable the manual invocation of the undo functionality.

USED_UBLK ---------2878 As you can see, updating that indexed column in this example generated almost two and a half times as much undo. This is due to the inherit complexity of the index structure itself and the fact that we updated every single row in the table moving every single index key value in this structure.

In the last chapter, we briefly investigated the ORA-01555 error and looked at one cause of it: committing too frequently. Here we ll take a much more detailed look at the causes and solutions for the ORA-01555 error. ORA-01555 is one of those errors that confound people. It is the foundation for many myths, inaccuracies, and suppositions.

I ll start by discussing the simplest of the three methods. Here s the BeginEdit() method: Public Sub BeginEdit() CopyState(Me.EditLevel + 1) End Sub When the business or UI developer explicitly calls BeginEdit(), the object takes a snapshot of its state and cascades that call to its child objects. You ve already seen how this is done in the CopyState() method implemented in UndoableBase, and BeginEdit() relies on that preexisting behavior.

Note ORA-01555 is not related to data corruption or data loss at all. It is a safe error in that regard; the only

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