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Now we can start by measuring the difference between a bulk insert into the NON_ENCRYPTED column versus the ENCRYPTED column: ops$tkyte%ORA11GR2> begin 2 do_sql( 'insert into t(non_encrypted) ' || 3 'select object_name from stage' ); 4 do_sql( 'insert into t(encrypted) ' || 5 'select object_name from stage' ); 6 end; 7 / insert into t(non_encrypted) select object_name from stage 13 cpu hsecs 23 mbytes redo insert into t(encrypted) select object_name from stage 121 cpu hsecs 53 mbytes redo PL/SQL procedure successfully completed So, column encryption had a definite impact here: almost 10 times as much CPU was used (on my hardware; your mileage may vary!) and more than twice as much redo was generated While 10 times as much CPU sounds like a lot, we might want to compare that to the do it yourself approach where the CPU utilization was closer to 50 times higher.

Trace files are a source of debugging information. When the server encounters a problem, it generates a trace file full of diagnostic information. When a developer sets SQL_TRACE=TRUE, the server generates a trace file full of performance-related information. Trace files are available to us because Oracle is a heavily instrumented piece of software. By instrumented, I mean that the programmers who wrote the database kernel put in debugging code lots and lots of it. And they left it in, on purpose. I ve met many developers who consider debugging code to be overhead something that must be ripped out before it goes into production in a vain attempt to squeeze every ounce of performance out of the code. Later, of course, they discover that their code has a bug or it isn t running as fast as it should (which end users tend to call a bug as well. To an end user, poor performance is a bug!). At that point, they are really wishing that the debug code was still in there (or had been in there if it never was), especially since they cannot drop debug code into the production system that is an environment where new code must be tested first, not something you do at the drop of a hat. The Oracle database (and Application Server and Oracle applications) is heavily instrumented. Signs of this instrumentation in the database are V$ views: Most V$ views contain debug information. V$WAITSTAT, V$SESSION_EVENT, and many others are there solely to let us know what is going on in the bowels of the kernel. The auditing command: This command allows you to specify what events the database should record for later analysis.

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Now, let s measure the impact of slow by slow processing also known as row by row processing This time we ll execute a dynamic PL/SQL block that will load the records from the STAGE table into T a row at a time, once referencing the non-encrypted column and then referencing the encrypted column: ops$tkyte%ORA11GR2> declare 2 l_sql long := 3 'begin ' || 4 'for x in (select object_name from stage) ' || 5 'loop ' || 6 'insert into t(#CNAME#) ' || 7 'values (xobject_name); ' || 8 'end loop; ' || 9 'end; '; 10 begin 11 do_sql( replace(l_sql,'#CNAME#','non_encrypted') ); 12 do_sql( replace(l_sql,'#CNAME#','encrypted') ); 13 end; 14 / begin for x in (select object_name from stage) loop insert into t(non_encrypted) values (xobject_name); end loop; end; 411 cpu hsecs 16.

Resource Manager (DBMS_RESOURCE_MANAGER): This feature allows you to micromanage resources (CPU, I/O, and the like) within the database What makes a Resource Manager in the database a possibility is the fact that it has access to all of the runtime statistics describing how the resources are being used Oracle events : These provide the ability for you to ask Oracle to produce trace or diagnostic information as needed DBMS_TRACE: This facility within the PL/SQL engine exhaustively records the call tree of stored procedures, exceptions raised, and errors encountered Database event triggers: These triggers, such as ON SERVERERROR, allow you to monitor and log any condition you feel is exceptional or out of the ordinary For example, you can log the SQL that was running when an out of temp space error was raised SQL_TRACE: The SQL Trace facility is also available in an extended fashion via the 10046 Oracle event .

pointcut illegalConnectionManagement() : (call(void Connection.close()) || call(void Connection.commit()) || call(void Connection.rollback()) || call(void Connection.setAutoCommit(boolean))) && !within(JDBCTransactionAspect); void around() : illegalConnectionManagement() { // Don't call proceed(); we want to bypass // illegal connection management here } }

5 mbytes redo begin for x in (select object_name from stage) loop insert into t(encrypted) values (xobject_name); end loop; end; 1039 cpu hsecs 194 mbytes redo This time we needed about 25 times as much CPU and just a little more redo This 25 times difference should be compared to the do it yourself encryption we saw previously; there we needed almost six times as much CPU So again, transparent column level encryption is much more efficient than the do it yourself approach This example points out the overhead of row by row operations in.

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