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Adding other tablespaces and datafiles within an OMF file system is easy. All you have to do is invoke the CREATE TABLESPACE command without the DATAFILE keyword. Oracle will automatically create the datafiles for the tablespace in the location specified in the DB_CREATE_FILE_DEST parameter. The example that follows shows how to create the tablespace: SQL> ALTER SYSTEM SET DB_CREATE_FILE_DEST = 2 '/test01/app/oracle/ora_omf/finance1'; System altered. SQL> CREATE TABLESPACE omftest; Tablespace created. SQL> SELECT file_name FROM dba_data_files 2 WHERE tablespace_name='OMFTEST'; FILE_NAME ----------------------------------------------------------/test01/app/oracle/oradata/ora_omf/ora_omftest_yj7590bm.dbf SQL> Compare the OMF tablespace-creation statement shown previously with the typical tablespacecreation statement, and you ll see how OMF simplifies database administration. Adding datafiles is also simple with OMF, as shown by the following example: SQL> ALTER TABLESPACE omftest ADD DATAFILE; OMF files, as you can see, simplify file administration chores and let you create and manage databases with a small number of initialization parameters. You can easily set up the necessary number of locations for your online redo log files, control files, and archive log files by specifying the appropriate value for the various OMF parameters. Oracle s ASM-based file system relies on the OMF file system.

9. Object Management Group, CORBA Messaging (technical report, www.omg.org/docs/formal/02-12-09.pdf, 2002).

Oracle recommends that you use online segment shrinking to compact segments that become fragmented over time due to the update and delete operations. A segment s high-water mark (HWM) shows the highest point of space usage ever reached by that segment. If you have unused space above the HWM, that means that this space has never been used by a table or an index segment.

You can use the DBMS_SPACE package, as shown in 5, to find out the amount of unused space in a segment You can then deallocate the unused space in a segment by using the ALTER TABLE (or ALTER INDEX) DEALLOCATE statement, as shown here: SQL> ALTER TABLE persons DEALLOCATE UNUSED KEEP 1000M; Once you execute the preceding statement, Oracle will take everything over 1,000MB from the persons segment and makes the newly free space available for other segments in the tablespace For example, if you have used 80 percent of a table segment s space by inserting rows into that segment, the HWM for that segment will be at 80 percent Later on, even if you delete half the rows, the table s HWM remains at 80 percent.

Figure 5-23. CORBA objects interacting via a messaging router The purpose of messaging routers is to decouple the client from the server, not only in space, but also in time. In other words, routers allow a client to send requests to a server that may be temporarily unavailable. The router works as a store-and-forward system, storing requests until the server becomes available. The router uses an ad hoc protocol to poll servers and determine when they become available. Rather than storing requests itself, a router can offload the task to another middleware system, such as a message queuing service. A new wire protocol called Interoperable Routing Protocol (IRP) is used to interact with middleware systems and to support routing between multiple CORBA messaging routers. This protocol is based on the standard OMG General Inter-ORB Protocol (GIOP), widely supported by vendors of CORBA systems. The use of routers becomes particularly useful when the path between a client and server includes the Internet. In this case, routers can act as Internet gateways at both ends of the client-server connection, as shown in Figure 5-24.

This has a detrimental effect on full-table scans and index scans, because Oracle will scan the table all the way to the HWM, even if there is currently very little data in the table A table segment with a large number of deletions will lead to fragmentation, leaving several gaps below its HWM You can, of course, reclaim the space you allotted to a table by creating a new table, copying all the existing data into it, and dropping the old table In previous versions of Oracle, you could also compact the unused pockets of space in table or index segments by reorganizing the object, which usually involved the MOVE command These reorganizations, which basically re-create the object in the same or a different tablespace, are sometimes very time consuming, and they also require additional space Also, contrary to Oracle s assurances, online availability for DML operations is sometimes diminished.

As of Oracle Database 10g, you can use the segment-shrinking capability to make sparsely populated segments give their space back to their parent tablespace You can reduce the HWM, thereby compacting the data within the segments Also as of Oracle Database 10g, you can shrink tables (including index-organized tables), partitions and subpartitions of a table, indexes, and materialized views (and materialized view logs)..

Note The segment-shrinking capability is termed an online and in-place operation. It s online because users can continue to access the tables during the shrinking operation. The operation is in-place because you don t need any duplicate or temporary database space during the segment-shrinking operations.