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SQL> connect system/system_passwd@local_db Connected. SQL> CREATE OR REPLACE DIRECTORY dest_dir as /'u01/app/oracle/dest'; You can now use the PUT_FILE procedure to put a local file on the remote server, as shown here: SQL> BEGIN DBMS_FILE_TRANSFER.PUT_FILE( source_directory_object source_file_name destination_directory_object destination_file_name destination_database END; / SQL>

'SOURCE_DIR', 'test01.dbf', 'DEST_DIR', 'test01.dbf', 'remote_db');

When using notifications to make calls between objects, there is a certain penalty incurred due to the indirect nature of the interactions. The overhead of making a single indirect call is generally minimal in a system, often accounting for a very small fraction of the system load. But the overhead may need to include other activities that add up quickly to big numbers. As stated earlier, there are two main categories of Fire methods: those dedicated to a single event type and those that handle arbitrary event types. The latter case has the potential to perform

The DBMS_SPACE package is useful for finding out how much space is used and how much free space is left in various segments such as table, index, and cluster segments Recall that the DBA_ FREE_SPACE dictionary view lets you find out free space information in tablespaces and datafiles, but not in the database objects Unless you use the DBMS_SPACE package, it s hard to find out how much free space is in the segments allocated to various objects in the database.

The DBMS_SPACE package enables you to answer questions such as the following: How much free space can I use before a new extent is thrown How many data blocks are above the high-water mark (HWM) The DBA_EXTENTS and the DBA_SEGMENTS dictionary views do give you a lot of information about the size allocated to objects such as tables and indexes, but you can t tell what the used and free space usage is from looking at those views If you ve been analyzing the tables, the BLOCKS column will give you the HWM the highest point in terms of size that the table has ever reached However, if your tables are undergoing a large number of inserts and deletes, the HWM isn t an accurate indictor of the real space used by the tables The DBMS_SPACE package is ideal for finding out the used and free space left in objects.

The DBMS_SPACE package has three main procedures: the UNUSED_SPACE procedure gives you information about the unused space in an object segment, the FREE_BLOCKS procedure gives you information about the number of free blocks in a segment, and the SPACE_USAGE procedure gives you details about space usage in the blocks Let s look at the UNUSED_SPACE procedure closely and see how you can use it to get detailed unused space information The procedure has three IN parameters (a fourth one is a default parameter) and seven OUT parameters Listing 6-11 shows the output from the execution of the UNUSED_SPACE procedure Listing 6-11 Using the DBMS_SPACEFREE_SPACE Procedure SQL> 2 3 4 5 6 7 8 DECLARE v_total_blocks NUMBER; v_total_bytes NUMBER; v_unused_blocks NUMBER; v_unused_bytes NUMBER; v_last_used_extent_file_id v_last_used_extent_block_id v_last_used_block.

poorly, because the Fire method must parse a parameter list or use other means to create the notification payload for an event whose type is determined on the fly at run time Some studies have shown that in extreme cases, this overhead can represent a significant fraction of a system s activity3 In such cases, optimizations might become necessary While optimization of event-based systems is currently at the experimental level, a number of techniques have been studied and shown to be useful In traditional systems, static analysis of call graphs can identify heavily used sections of code, providing a way to determine which methods should be optimized to give the greatest benefit In an event-based system, a large number of bindings between objects is established at run time, so static tools are of little help.

NUMBER; NUMBER; NUMBER;