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You know that one way to avoid data anomalies is to prevent more than one user from viewing or changing data at the same time. However, this defeats our main purpose of providing concurrent access to users. To control this trade-off between concurrency and isolation, you specify an isolation level for each transaction. The ISO (http://www.iso.ch) standard for transactions rests on the two key transaction-ending statements: COMMIT and ROLLBACK. All transactions, according to the ISO standard, begin with a SELECT, UPDATE, INSERT or DELETE statement. No transaction can view another transaction s intermediate results. Results of a second transaction are available to the first transaction only after the second transaction completes. The ISO transaction standards ensure the compliance of transactions with the atomic and isolation properties, and help avoid the concurrency problems explained in the previous section. All transactions must ensure that they preserve database consistency. A database is consistent before a transaction begins, and it must be left in a consistent state at the end of the transaction. If you can devise a method to avoid the problems mentioned in the previous section, you can ensure a high degree of concurrent interactions among transactions in the database. There is a price to pay for this, however. Attempts to reduce the anomalies will result in reduced concurrency. You can achieve consistency by enforcing serial use of the database, but it s impractical. Therefore, the practical goal is to find those types of concurrent transactions that don t interfere with each other in other words, to find transactions that guarantee a serializable schedule. Proper ordering of the transactions becomes very important, unless they re all read-only transactions.

I ran that block simply to get the hard parse of the SQL and PL/SQL performed so when we run it later, we won t have to worry about side effects from hard parsing being counted Now we are ready to load the data into our table and commit: ops$tkyte%ORA11GR2> insert into t 2 select rownum, 'x', 'y', 'z' 3 from all_objects 4 where rownum <= 10000; 10000 rows created ops$tkyte%ORA11GR2> commit; Commit complete..

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If a segment has a single freelist, then the master and process freelists are one and the same thing If you have two freelists, you ll really have one master freelist and two process freelists A given session will be assigned to a single process freelist based on a hash of its session ID Now, each process freelist will have very few blocks on it the remaining free blocks are on the master freelist As a process freelist is used, it will pull a few blocks from the master freelist as needed If the master freelist cannot satisfy the space requirement, then Oracle will advance the HWM and add empty blocks to the master freelist So, over time, the master freelist will fan out its storage over the many process freelists (again, each of which has only a few blocks on it).

For an Oracle DBA, no task is more fundamental and critical than protecting the database itself. The Oracle DBA is the person the information departments entrust with safeguarding the organization s data, and this involves preventing unauthorized use of and access to the database. The DBA has several means to ensure the database s security, and based on the company s security guidelines, he or she needs to maintain the database security policy (and to create the policy if it doesn t already exist). A more complex issue is the authorization of users actions within the database itself, after access has already been granted. I address this topic in depth in 12.

And, finally, I m ready to measure the amount of redo generated during the first read of the data: ops$tkyte%ORA11GR2> variable redo number ops$tkyte%ORA11GR2> exec :redo := get_stat_val( 'redo size' ); PL/SQL procedure successfully completed ops$tkyte%ORA11GR2> declare 2 l_rec t%rowtype; 3 begin 4 for i in 1 . 10000 5 loop 6 select * into l_rec from t where id=i; 7 end loop; 8 end; 9 / PL/SQL procedure successfully completed ops$tkyte%ORA11GR2> exec dbms_outputput_line( (get_stat_val('redo size')-:redo) || ' bytes of redo generated..'); 722048 bytes of redo generated.. PL/SQL procedure successfully completed So, this SELECT generated about 722KB of redo during its processing This represents the block headers it modified during the index read of the primary key index and the subsequent table read of T.

Note Some organizations don t have a general security policy in place. This is particularly true of smaller companies. In that case, it s usually up to the DBA to come up with the security policy and then enforce it within the database.

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