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Note that even though we have an infinite while loop inside the advice, the captured thread s run() method will execute only once before ThreadPoolputThread() is called to put the thread into the pool until it is needed by another thread Once the thread is woken up, it will execute the captured thread s run() method one more time, and the cycle continues The around advice to the threadStart() pointcut attempts to wake up the thread If this thread was obtained from the pool, it will be woken up If this was a newly created thread, wakeupThread() will return false In that case, proceed() will call the original start() method to start the new thread In either case, the thread will execute the delegated run() method once before the thread is put into the waiting state by the advice to the session() pointcut..

Now we are ready to look at the last class of Oracle processes: the slave processes. There are two types of slave processes with Oracle, I/O slaves and parallel query slaves.

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that is less than 01-JAN-2005. However, the next insert of midnight on 01-JAN-2005 goes into partition PART_2 because that date/time is not strictly less than the partition range boundary. The last row obviously belongs in partition PART_2 since it is less than the partition range boundary for PART_2. We can confirm that this is the case by performing SELECT statements from the individual partitions: ops$tkyte@ORA10G> select to_char(range_key_column,'dd-mon-yyyy hh24:mi:ss') 2 from range_example partition (part_1); TO_CHAR(RANGE_KEY_CO -------------------15-dec-2004 00:00:00 31-dec-2004 23:59:59 ops$tkyte@ORA10G> select to_char(range_key_column,'dd-mon-yyyy hh24:mi:ss') 2 from range_example partition (part_2); TO_CHAR(RANGE_KEY_CO -------------------01-jan-2005 00:00:00 15-dec-2005 00:00:00 You might be wondering what would happen if you inserted a date that fell outside of the upper bound. The answer is that Oracle will raise an error: ops$tkyte@ORA10GR1> insert into range_example 2 ( range_key_column, data ) 3 values 4 ( to_date( '15/12/2007 00:00:00', 5 'dd/mm/yyyy hh24:mi:ss' ), 6 'application data...' ); insert into range_example * ERROR at line 1: ORA-14400: inserted partition key does not map to any partition Suppose you want to segregate 2005 and 2006 dates into their separate partitions as we have, but you want all other dates to go into a third partition. With range partitioning, you can do this using the MAXVALUE clause, which looks like this: ops$tkyte@ORA10GR1> CREATE TABLE range_example 2 ( range_key_column date , 3 data varchar2(20) 4 ) 5 PARTITION BY RANGE (range_key_column) 6 ( PARTITION part_1 VALUES LESS THAN 7 (to_date('01/01/2005','dd/mm/yyyy')), 8 PARTITION part_2 VALUES LESS THAN

I/O slaves are used to emulate asynchronous I/O for systems or devices that do not support it For example, tape devices (which are notoriously slow) do not support asynchronous I/O By using I/O slaves, we can mimic for tape drives what the operating system normally provides for disk drives Just as with true asynchronous I/O, the process writing to the device batches a large amount of data and hands it off to be written When the data is successfully written, the writer (our I/O slave this time, not the operating system) signals the original invoker, who removes this batch of data from its list of data that needs to be written In this fashion, we can achieve a much higher throughput, since the I/O slaves are the ones waiting for the slow device, while their caller is off doing other important work getting the data together for the next write.

One implication of our solution is that it will pool all threads created in the system not just for the server. This may or may not be desirable. We discuss ways to handle this situation later in this section.

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I/O slaves are used in a couple of places in Oracle DBWn and LGWR can make use of them to simulate asynchronous I/O, and RMAN will make use of them when writing to tape Two parameters control the use of I/O slaves: BACKUP_TAPE_IO_SLAVES: This parameter specifies whether I/O slaves are used by RMAN to back up, copy, or restore data to tape Since this parameter is designed around tape devices, and tape devices may be accessed by only one process at any time, this parameter is a Boolean, and not the number of slaves to use, as you might expect RMAN will start up as many slaves as necessary for the number of physical devices being used When BACKUP_TAPE_IO_SLAVES = TRUE, an I/O slave process is used to write to or read from a tape device.

(to_date('01/01/2006','dd/mm/yyyy')) PARTITION part_3 VALUES LESS THAN (MAXVALUE) ) /

7.4.4 Implementing the thread pool Next let s look at the class that implements the thread pool interface. Listing 7.14 shows the SimpleThreadPool interface that we used in our thread pooling aspect.

If this parameter is FALSE (the default), then I/O slaves are not used for backups Instead, the dedicated server process engaged in the backup will access the tape device DBWR_IO_SLAVES: This parameter specifies the number of I/O slaves used by the DBW0 process The DBW0 process and its slaves always perform the writing to disk of dirty blocks in the buffer cache By default, the value is 0 and I/O slaves are not used Note that if you set this parameter to a nonzero value, LGWR and ARCH will use their own I/O slaves as well, up to four I/O slaves for LGWR and ARCH will be permitted..

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