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So far, we ve looked at read consistency: Oracle s ability to use undo information to provide nonblocking query and consistent (correct) reads. We understand that as Oracle reads blocks for queries out of the buffer cache, it will ensure that the version of the block is old enough to be seen by that query. But that begs the following questions: What about writes/modifications What happens when you run an UPDATE statement Update t set x = 2 where y = 5; and while that statement is running, someone updates a row it has yet to read from Y=5 to Y=6 and commits That is, when your UPDATE began, some row had the value Y=5. As your UPDATE reads the table using consistent reads, it sees that the row was Y=5 when the UPDATE began. But, the current value for Y is now 6 (it s not 5 anymore) and before updating the value of X, Oracle will check to see that Y is still 5. Now what happens How are the updates affected by this Obviously, we can t modify an old version of a block; when we go to modify a row, we must modify the current version of that block. Additionally, Oracle can t just simply skip this row, as that would be an inconsistent read and unpredictable. What we ll discover is that in such cases, Oracle will restart the write modification from scratch.

The HOST command in the preceding example will help you copy the new.sql file from the specified directory to the tmp directory. Just about any command you can use at the operating system level can be executed using the HOST command. You can replace the HOST command with ! (bang, or exclamation point) to run operating system commands from within SQL*Plus, as in the following example: SQL> ! cp /u01/app/oracle/new.sql /tmp

What actually takes place is a little more involved, but having a good understanding of the flow of how it works is valuable and will help you to understand the ramifications of your actions..

If you just type the command by itself, as in HOST or !, you ll be transported to the operating system directory from which you logged into the SQL*Plus session.

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Oracle does do two types of block gets when processing a modification statement. It performs Consistent reads: When finding the rows to modify Current reads: When getting the block to actually update the row of interest

When you re done with your operating system task, just type exit on the command line, and you ll return to the SQL*Plus session you just left. Here s an example: SQL> HOST $ exit SQL>

Redo log files are crucial to the Oracle database. These are the transaction logs for the database. Oracle maintains two types of redo log files: online and archived. They are used for recovery purposes; their purpose in life is to be used in the event of an instance or media failure. If the power goes off on your database machine, causing an instance failure, Oracle will use the online redo logs to restore the system to exactly the point it was at immediately prior to the power outage. If your disk drive fails (a media failure), Oracle will use archived redo logs as well as online redo logs to recover a backup of the data that was on that drive to the correct point in time. Additionally, if you accidentally truncate a table or remove some

We can see this easily using TKPROF. Consider this small one row example, which reads and updates the single row in table T from earlier: ops$tkyte%ORA11GR2> exec dbms_monitor.session_trace_enable PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> select * from t; X ---------10001 ops$tkyte%ORA11GR2> update t t1 set x = x+1; 1 row updated. ops$tkyte%ORA11GR2> update t t2 set x = x+1; 1 row updated.

The SPOOL command enables you to save the output of one or more SQL statements to an operating system file in both UNIX and Windows: SQL> SQL> SQL> SQL> SET LINESIZE 180 SPOOL employee.lst SELECT emp_id, last_name, salary, manager FROM employee; SPOOL OFF;

By default, spooled text files are saved as filename.lst. Although the default behavior is to save the output in a file, you can also send the output to a printer. Spooling files is very useful when you use SQL to help write SQL scripts, and you can see examples in the Appendix of this book. You can append to, or replace, an existing spool file (replacing is the default). Here is the full syntax of the command: SPOOL { file_name[.ext] [CRE[ATE]|REP[LACE]|APP[END]]| OFF | OUT } This is what the various options stand for: FILE_NAME: Specifies the name of the spool file. The file extension is optional, and .lst is the default extension in most cases. CREATE: Creates a new file. REPLACE: Replaces the contents of an existing file and creates a new file if the file doesn t exist. This is the default behavior. APPEND: Adds the contents of the buffer to the end of a file you specify. OFF: Stops spooling. OUT: Stops spooling and sends the file to your default printer. This option is not available on some operating systems.

Note I will use autonomous transactions throughout this book to demonstrate locking, blocking, and

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