Logging Table changes and transactions

Question

I am using oracle 11.2 DB and need to track some changes made to specific tables (need to capture old/new values of columns). I have experimented with creating a MV log on a table which seems to get me most of what I want:
CREATE materialized view log on students WITH SEQUENCE,rowid (id,last_name,first_name,middle_name) INCLUDING NEW VALUES
Since some of the processes update more that 1 table at a time before doing a commit, I need to be able to capture that these 3 table updates are all part of the same transaction (commit) . Is there any way of doing that?
ie.
update table 1 set x = '1';
update table 2 set y = '2';
update table 3 set z = '3';
commit;

Answer 1

Triggers:
http://www.adp-gmbh.ch/ora/sql/trigger/before_after_each_row.html
http://docs.oracle.com/cd/B28359_01/appdev.111/b28370/triggers.htm
      bobmagan     
Handle:      bobmagan 
Status Level:      Newbie
Registered:      Feb 22, 2010
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