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So, if the application code itself is not to be made responsible for maintaining this LAST_MOD field, then I believe that the application should not be made responsible for checking this LAST_MOD field either (if it can do the check, it can certainly do the update!). So, in this case, I suggest encapsulating the update logic in a stored procedure and not allowing the application to update the table directly at all. If it cannot be trusted to maintain the value in this field, then it cannot be trusted to check it properly either. So, the stored procedure would take as inputs the bind variables we used in the previous updates and do exactly the same update. Upon detecting that zero rows were updated, the stored procedure could raise an exception back to the client to let the client know the update had, in effect, failed. An alternate implementation uses a trigger to maintain this LAST_MOD field, but for something as simple as this, my recommendation is to avoid the trigger and let the DML take care of it. Triggers introduce a measurable amount of overhead, and in this case they would be unnecessary.

If you specify AUDIT_TRAIL=OS, the audit trail won t store the audit information in the database. It will instead store that information in the location specified by the AUDIT_FILE_DEST parameter. If you specify AUDIT_TRAIL=OS and omit the AUDIT_FILE_DEST parameter, by default the audit information will be written to the $ORACLE_HOME/rdbms/audit/ directory.

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If the query was SELECT X,Y FROM T WHERE Y = 5, the optimizer would notice that it did not have to go to the table to get either X or Y (they are in the index) and may very well opt for a fast full scan of the index itself, as the index is typically much smaller than the underlying table Note also that this access path is only available with the CBO Another case whereby the index on T(x,y) could be used with the CBO is during an index skip scan The skip scan works well if and only if the leading edge of the index (X in the previous example) has very few distinct values and the optimizer understands that For example, consider an index on (GENDER, EMPNO) where GENDER has the values M and F, and EMPNO is unique.

Tip If you specify AUDIT_TRAIL=DB, the audit records will be logged to a special table owned by SYS called SYS.AUD$, located in the System tablespace. If you want to do any kind of serious auditing on your database, the tablespace will quickly run out of space. Make sure you change the storage parameters of the SYS.AUD$ table and add more space to the System tablespace before you turn auditing on. Otherwise, you run the risk of filling up your System tablespace while auditing the database.

This is very similar to the previous version column method, but it uses the base data itself to compute a virtual version column I ll quote the Oracle 10g PL/SQL Supplied Packages Guide (before showing how to use one of the supplied packages!) to help explain the goal and concepts behind a checksum or hash function: A one-way hash function takes a variable-length input string, the data, and converts it to a fixed-length (generally smaller) output string called a hash value The hash value serves as a unique identifier (like a fingerprint) of the input data You can use the hash value to verify whether data has been changed or not Note that a one-way hash function is a hash function that works in one direction.

You can use the DBA_AUDIT_TRAIL view to make use of the information in the database audit trail table (SYS.AUD$). Depending on the event you are auditing and the options you select for auditing, you may see the following types of data in the audit trail: Operating system login Database username Terminal and session identifiers Operation performed or attempted Date and time stamp SQL text that triggered the auditing You don t need to be overly concerned with the filling up of the SYS.AUD$ table when auditing is turned on. You can always truncate the table after exporting the contents to a different location or when you deem it isn t necessary to store the contents of the audit table any longer.

A query such as select * from t where empno = 5; might consider using that index on T to satisfy the query in a skip scan method, meaning the query will be processed conceptually like this select * from t where GENDER='M' and empno = 5 UNION ALL select * from t where GENDER='F' and empno = 5; It will skip throughout the index, pretending it is two indexes: one for Ms and one for Fs We can see this in a query plan easily We ll set up a table with a bivalued column and index it: ops$tkyte@ORA11GR2> create table t 2 as 3 select decode(mod(rownum,2), 0, 'M', 'F' ) gender, all_objects* 4 from all_objects 5 / Table created ops$tkyte@ORA11GR2> create index t_idx on t(gender,object_id) 2 / Index created ops$tkyte@ORA11GR2> begin 2 dbms_statsgather_table_stats 3 ( user, 'T' ); 4 end; 5 / PL/SQL procedure successfully completed..

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