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Workers should be focused on solving problems related to business logic, without knowledge of how end users initiate a particular task, whether an operation should be carried out synchronously or asynchronously, or what effect a result has on the rest of the system. Within these guidelines, there are a few types of things a worker probably shouldn t get involved with, except under special applicationspecific conditions: Exposed Worker methods shouldn t be asynchronous: Public Worker methods are simpler to develop and test if they are synchronous. If client objects calling a specific method need an asynchronous behavior, the burden of asynchrony should be placed on the client. In practice, the client might use a Coordinator to handle the Worker threading logic. Workers shouldn t deal with thread issues: Workers should not contain logic that interacts with other threads. Workers should not create threads for internal purposes, and they should not contain thread-synchronization logic. Thread-related code belongs in a Coordinator. When firing events, workers should not try to send notifications across thread boundaries. The less a worker knows about threads, the better.

due to the granularity of the clock. A MERGE operation will not be affected by this (i.e., update existing record in the data warehouse or insert a new record).

SQL> SELECT table_name FROM dba_tables 2 WHERE owner ='OUTLN'; TABLE_NAME ----------OL$ OL$HINTS OL$NODES SQL>

You can use the USER_OUTLINES (or DBA_OUTLINES) and USER_OUTLINE_HINTS views to get information about the stored outlines in your database. The following code shows the output of such a query: SQL> SELECT name,used, 2* timestamp, sql_text FROM user_outlines; NAME USED TIMESTAMP SQL_TEXT -------------------------------------SYS_02283 SQL> USED 25-JUL-05 SELECT * FROM EMP

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They believe that they now have all of the records in the data warehouse that were modified since they did the initial pull They may actually have all of the records, but just as likely they may not This technique does work on some other databases ones that employ a locking system whereby reads are blocked by writes and vice versa But in a system where you have non-blocking reads, the logic is flawed To see the flaw in this example, all we need to do is assume that at 9:00 am there was at least one open, uncommitted transaction At 8:59:30 am, it had updated a row in the table we were to copy At 9:00 am, when we started pulling the data, reading the data in this table, we would not see the modifications to that row; we would see the last committed version of it.

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Workers shouldn t manage transactions: A transaction is a group of tasks that all must succeed or fail collectively. If they succeed, a commit operation is performed, making all the transaction results available at once. If any of the tasks fail, a rollback operation is performed, restoring the system to the state it was in before the transaction started. Normally, you should assign transaction management to a Coordinator, even if the same Worker handles all the tasks. The Coordinator is put in charge of a list of tasks that are part of a transaction. Workers carry out the individual tasks. If all the tasks succeed, the Coordinator commits the changes; otherwise, it rolls the changes back. The commit and rollback operations might be considered tasks themselves and therefore be performed by workers, especially if the details of committing or rolling back changes are business-rule-dependent. Workers shouldn t handle notification routing: Workers should communicate with the rest of the system using notifications exclusively. When using method calls to deliver notifications, workers should use untyped object calls, where possible, to introduce the least amount of run-time coupling possible. To avoid the introduction of extraneous coupling, workers should not be responsible for binding their notifications to event handler methods. A separate Coordinator or a dedicated Binder component should handle binding.

For Oracle to use stored outlines consistently, you need to turn the USE_STORED_OUTLINES parameter on by setting its value to TRUE. By doing this, you re ensuring that the CBO is stable and won t change its plans over time. If the system tablespace is being filled up with too many stored outlines, you can drop some of the outlines by using the DBMS_OUTLN.DROP_UNUSED procedure. This procedure, which doesn t need any parameters, removes all literal SQL outlines from the OUTLN tables. The DBMS_OUTLN_EDIT.CREATE_EDIT_TABLES procedure. creates tables in a user s schema if you need to edit any private outlines. The DBMS_OUTLN_EDIT.DROP_TABLES procedure enables you to drop the outlined editing tables.

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