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n RequiresNew [or @TransactionAttribute(REQUIRES_NEW) annotation in EJB 3.0] Containers create new transactions before each method call on the bean and commit transactions before returning. A new transaction is always started when the bean method is called. If a transaction already exists, that transaction is suspended until the new transaction completes. n Mandatory [or @TransactionAttribute(MANDATORY) annotation in EJB 3.0] Method calls require a transaction context. If one does not exist, an exception is thrown. An active transaction must already exist. If no transaction exists, the javax.ejb.TransactionRequired exception is thrown. n Never [or @TransactionAttribute(NEVER) annotation in EJB 3.0] Method calls require that no transaction context be present. If one exists, an exception is thrown. The bean must never run with a transaction. If a transaction exists, the java.rmi.RemoteException exception is thrown.

The possibility of counting a fact more than once is a real and present danger when a hierarchy bridge table is in use. In the case of looking down, this danger is avoided by

A container can manage multiple transactions in two different ways: The container could instantiate multiple instances of the bean, allowing the transaction management of the DBMS to handle any transaction processing issues. Conversely, the container could acquire an exclusive lock on the instance s state in the database, serializing access from multiple transactions to this instance.

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selecting a single upper-level member of the hierarchy, or by grouping results by upperlevel members In the case of looking down, it is avoided by selecting a lower-level member or by grouping results by lower-level members Double-counting can also be avoided by using the bridge in a subquery instead of joining it to the fact table To understand this danger and the solution, consider the content of the fact table Suppose, for example, that Company 8 placed an order The fact table will contain a row for this transaction, with the appropriate company_key for Company 8 If you look back at Figure 10-7, you will see that Company 8 is subordinate to several companies To be specific, it lies beneath Companies 6, 5, and 1 There is also a row that links Company 8 to itself.

A developer s effective use of error handling procedures is often an excellent indicator of his or her experience in that particular programming language. Those of

The JTS specifies the implementation of a transaction manager supporting the JTA. JTS also implements the Java mapping of the Object Management Group s (OMG) Object Transaction Service (OTS). The EJB specification suggests but does not require transactions based on the JTS API. JTS supports distributed transactions, which have the ability to span multiple databases on multiple systems coordinated by multiple transaction managers. By using JTS, an EJB container ensures that its transactions can span multiple EJB containers.

That means that if we are not careful, Company 8 s order may be counted as many as four times When the looking down configuration in Figure 10-7 was used to query the facts, a constraint was placed on the company table This limited the results to those companies that could be found in the bridge that have Company 5 as a superior As a result, Company 8 was counted only once You can see this in the shaded area of the table Although Company 8 is also linked to Companies 1, 6, and 8, these possibilities were eliminated when the query constrained on Company 5 It is also possible to avoid trouble without establishing a filter if you take care to group results by a top-level member Such reports are similar to the impact reports of the previous chapter.

EJB applications communicate with a transaction service using the JTA, which provides a programming interface to start transactions, join existing transactions, commit transactions, and roll back transactions. When a bean with bean-managed transactions is invoked, the container suspends any current transaction in the client s context. In its method implementation,

Facts may be counted in the groupings returned for each of the companies above them For example, any orders by Company 8 will be included in totals for Companies 1, 5, 6, and 8 As long as these group totals are not subsequently added up to construct a grand total, the report is valid Filtering for a specific member of the hierarchy or grouping by specific members are the only options to avoid trouble Using any attribute of the dimension may cause a severe miscalculation of the facts For example, assume that the companies in Figure 10-7 are all in the finance industry If the company constraint in Figure 10-7 is replaced by company_ type="Finance", a severe miscalculation will take place Company 8, for example, appears under three companies in the finance industry (1, 5, and 6), so its orders will be counted more than once.

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