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Now, if we query the table again, we ll discover that it takes considerably more I/Os to read the table this time: ops$tkyte%ORA11GR2> select * from t; no rows selected ops$tkyte%ORA11GR2> set autotrace traceonly statistics ops$tkyte%ORA11GR2> select * from t; no rows selected Statistics ---------------------------------------------------------0 recursive calls 0 db block gets 1073 consistent gets 0 physical reads ...ORA11GR2> set autotrace off The blocks that our INSERT caused to be added under the table s high-water mark (HWM) are still there formatted, but empty. Our full scan had to read them to see if they contained any rows. Moreover, the first time we ran the query, we observed zero I/Os. That was due to the default mode of table creation in Oracle Database 11g Release 2 using deferred segment creation. When we issued that CREATE TABLE, no storage, not a single extent, was allocated. The segment creation was deferred until the INSERT took place, and when we rolled back, the segment persisted. You can see this easily with a smaller example, I ll explicitly request deferred segment creation this time although it is enabled by default in 11g Release 2: ops$tkyte%ORA11GR2> create table t ( x int ) 2 segment creation deferred; Table created. ops$tkyte%ORA11GR2> select extent_id, bytes, blocks 2 from user_extents 3 where segment_name = 'T' 4 order by extent_id; no rows selected ops$tkyte%ORA11GR2> insert into t(x) values (1); 1 row created. ops$tkyte%ORA11GR2> rollback; Rollback complete. ops$tkyte%ORA11GR2> select extent_id, bytes, blocks 2 from user_extents 3 where segment_name = 'T' 4 order by extent_id; EXTENT_ID BYTES BLOCKS ---------- ---------- ---------0 65536 8

You will find that an update of an unindexed column not only executes much faster, but will tend 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@ORA10G> create table t 2 as 3 select object_name unindexed, 4 object_name indexed 5 from all_objects 6 / Table created..

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Argument pointcuts These pointcuts capture join points based on the argument type of a join point. For method and constructor join points, the arguments are simply the method and constructor arguments. For exception handler join points, the handled exception object is considered an argument, whereas for field write access join points, the new value to be set is considered the argument for the join point. Argument-based pointcuts take the form of args(TypePattern or ObjectIdentifier, ..). Similar to execution object pointcuts, these pointcuts can be used to capture the context, but again more will be said about this in section 3.2.6. Table 3.10 shows some examples of the usage of argument pointcuts.

As you can see, after the table create there was no allocated storage no extents were used by this table. Upon performing an INSERT, followed immediately by ROLLBACK, we can see the INSERT allocated storage but the ROLLBACK does not release it. Those two things together that the segment was actually created by the INSERT but not uncreated by the ROLLBACK, and that the new formatted blocks created by the INSERT were scanned the second time around show that a rollback is a logical put the database back the way it was operation. The database will not be exactly the way it was, just logically the same.

ops$tkyte@ORA10G> create index t_idx on t(indexed); Index created. ops$tkyte@ORA10G> 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$TRANSACTION record (if any) and selects the USED_UBLK column the number of used undo blocks. Since we currently are not in a transaction, the query is expected to return 0 rows right now: ops$tkyte@ORA10G> select used_ublk 2 from v$transaction 3 where addr = (select taddr 4 from v$session 5 where sid = (select sid 6 from v$mystat 7 where rownum = 1 8 ) 9 ) 10 / no rows selected This is the query I ll use after each UPDATE, but I won t repeat it in the text I ll just show the results. Now we are ready to perform the updates and measure the number of undo blocks used by each: ops$tkyte@ORA10G> update t set unindexed = lower(unindexed); 48771 rows updated. ops$tkyte@ORA10G> select used_ublk ... 10 / USED_UBLK ---------401 ops$tkyte@ORA10G> commit; Commit complete. That UPDATE used 401 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:

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