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among others Instrumentation is vital in application design and development, and the Oracle database becomes better instrumented with each release In fact, the amount of additional instrumentation in the database between Oracle9i Release 2 and Oracle 10g Release 1 itself is phenomenal Oracle 10g took code instrumentation in the kernel to a whole new level In this section we re going to focus on the information that can be found in various types of trace files We ll cover what they are, where they are stored, and what we can do with them There are generally two types of trace file, and what we do with each kind is very different: Trace files you expected and want: For example, these are the result of enabling SQL_TRACE=TRUE.

general, however. By doing things very inefficiently (loading a row at a time), some of the overhead of column level encryption is hidden, due to the fact that so much of our time is now spent processing the INSERTS, not performing the encryption itself.

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Let s get into the implementation details: The aspect is associated with each top-level transaction s control flow This association forces the creation of a new instance of the subaspect for each invocation of the operation specified by the topLevelTransactedOperation() pointcut; this instance maintains the state of the transaction All the concrete subaspects of JDBCTransactionAspect must implement the abstract pointcuts transactedOperation() and obtainConnection() The transactedOperation() definition should declare the execution of transactional operations The obtainConnection() definition should capture join points that obtain the connections The topLevelTransactedOperation() pointcut is defined to be the top-level operation needing transaction support by using the abstract transactedOperation() pointcut This pointcut needs to be advised to perform the transaction management The top-level pointcut is the one with which a new instance of the aspect is associated.

They contain diagnostic information about your session and will help you tune your application to optimize its performance and diagnose what bottlenecks it is experiencing Trace files you were not expecting to receive but the server generated as the result of an ORA-00600 Internal Error , ORA-03113 End of file on communication channel , or ORA-07445 Exception Encountered error: These traces contain diagnostic information that is most useful to an Oracle Support analyst and, beyond showing us where in our application the internal error was raised, are of limited use to us..

The last performance test is to evaluate the cost of data retrieval Since the column level encryption stores the information in the buffer cache encrypted, we know that every retrieval will incur the cost of performing a decryption on the data, and we d like to know what that cost might be In order to perform this test, we ll load both columns with data and then retrieve each column one at a time We ll start by truncating the existing data, loading both columns, and gathering statistics on our table: ops$tkyte%ORA11GR2> truncate table t; Table truncated ops$tkyte%ORA11GR2> insert into t select object_name, object_name from stage; 64630 rows created ops$tkyte%ORA11GR2> exec dbms_statsgather_table_stats( user, 'T' ); PL/SQL procedure successfully completed Now we can run our retrieval tests in a manner very similar to the row by row test for insertions we just performed.

The major differences between this test and the previous one are that we ll be selecting the data, not inserting it, and we will not be truncating the table in the DO_SQL routine: ops$tkyte%ORA11GR2> declare 2 l_sql long := 3 'begin ' || 4 'for x in (select #CNAME# from t) ' || 5 'loop ' || 6 'null; ' || 7 'end loop; ' || 8 'end; '; 9 begin 10 do_sql( replace(l_sql,'#CNAME#','non_encrypted'), FALSE ); 11 do_sql( replace(l_sql,'#CNAME#','encrypted'), FALSE ); 12 end; 13 / begin for x in (select non_encrypted from t) loop null; end loop; end; 7 cpu hsecs 0 mbytes redo begin for x in (select encrypted from t) loop null; end loop; end; 69 cpu hsecs 0 mbytes redo PL/SQL procedure successfully completed As you can see, it took almost 10 times as much CPU to retrieve the encrypted column as the nonencrypted column.

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