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So, how does Oracle get the correct, consistent answer ($1250) during a read without locking any data in other words, without decreasing concurrency The secret lies in the transactional mechanisms that Oracle uses Whenever you modify data, Oracle creates entries in two different locations (most other databases would put both entries in the same location; for them undo and redo are just transaction data ) One entry goes to the redo logs where Oracle stores enough information to redo or roll forward the transaction For an insert, this would be the row inserted For a delete, it is a message to delete the row in file X, block Y, row slot Z And so on The other entry is an undo entry, written to an undo segment If your transaction fails and needs to be undone, Oracle will read the before image from the undo segment and restore the data.

In Oracle Database 11g, you have the option of using either the Database Control or Grid Control version of Enterprise Manager The Enterprise Manager Database Control is automatically installed along with the Oracle software and is designed to run as a stand-alone application In order to manage several databases, however, you need to separately install the Enterprise Manager Grid Control software on your server and the OEM Agent software on all the targets you wish to monitor The Oracle Enterprise Manager tool always looked promising in previous versions, but it delivered inconsistent performance This hard reality, plus the fact that many DBAs are comfortable with manual commands and scripts based on the database dictionary and the dynamic (V$) views, led to a low acceptance rate of the tool Since the Oracle Database 10g release, the OEM tool has gone through a sea change and delivers high-level performance.

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ops$tkyte@ORA10G> begin 2 for x in ( select deptno, dname, loc 3 from dept 4 where deptno = 10 5 for update nowait ) 6 loop 7 if ( hextoraw( 'C44F7052661CE945D385D5C3F911E70FA99407A6' ) <> 8 dbms_crypto.hash 9 ( utl_raw.cast_to_raw(x.deptno||'/'||x.dname||'/'||x.loc), 10 dbms_crypto.hash_sh1 ) ) 11 then 12 raise_application_error(-20001, 'Row was modified' ); 13 end if; 14 end loop; 15 update dept 16 set dname = lower(dname) 17 where deptno = 10; 18 commit; 19 end; 20 / PL/SQL procedure successfully completed. Upon requerying that data and computing the hash again after the update, we can see that the hash value is very different. If someone had modified the row before we did, our hash values would not have compared: ops$tkyte@ORA10G> begin 2 for x in ( select deptno, dname, loc 3 from dept 4 where deptno = 10 ) 5 loop 6 dbms_output.put_line( 'Dname: ' || x.dname ); 7 dbms_output.put_line( 'Loc: ' || x.loc ); 8 dbms_output.put_line( 'Hash: ' || 9 dbms_crypto.hash 10 ( utl_raw.cast_to_raw(x.deptno||'/'||x.dname||'/'||x.loc), 11 dbms_crypto.hash_sh1 ) ); 12 end loop; 13 end; 14 / Dname: accounting Loc: NEW YORK Hash: F3DE485922D44DF598C2CEBC34C27DD2216FB90F PL/SQL procedure successfully completed.

I strongly recommend using the Database Control or the Grid Control tool to monitor and manage your databases You can invoke all the new management advisors and tools, like the ADDM from the OEM toolset, without having to use complex Oracle PL/SQL packages I show OEM examples throughout this book..

In addition to using this undo segment data to undo transactions, Oracle uses it to undo changes to blocks as it is reading them to restore the block to the point in time your query began This gives you the ability to read right through a lock and to get consistent, correct answers without locking any data yourself So, as far as our example is concerned, Oracle arrives at its answer as shown in Table 1-2 Table 1-2 Multi-versioning in Action.

Note Traditionally, all GUI tools relied on the same V$ performance views that are used in database queries. However, OEM can access key performance data directly from the SGA, without making any SQL queries. This is done by attaching directly to the SGA and reading the statistics from the shared memory. When your database is performing extremely slowly or hangs, you can t rely on the dynamic V$ views to troubleshoot the problem doing so may actually end up making matters worse! This is one more reason why you should make the OEM your main means of monitoring and managing the Oracle instance.

This example showed how to implement optimistic locking with a hash or checksum. You should bear in mind that computing a hash or checksum is a somewhat CPU-intensive operation it is computationally expensive. On a system where CPU is a scarce resource, you must take this fact into consideration. However, this approach is much more network-friendly, as the transmission of a relatively small hash instead of a before and after image of the row (to compare column by column) over the network will consume much less of that resource. Our last example will use a new Oracle 10g function, ORA_ROWSCN, which is small in size like a hash, but not CPU intensive to compute.

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