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An index with included non-key columns can significantly improve query performance when all columns in the query are included in the index either as key or non-key columns. Performance gains are achieved because the query optimizer can locate all the column values within the index; table or clustered index data is not accessed, resulting in fewer disk I/O operations. Understanding the physical structure of indexes in SQL Server 2005 helps database developers to optimize both the creation and use of proper indexes specific to their application.

public void endAuction(Item item) { // Reattach item itemDAO.makePersistent(item); // Set winning bid Bid winningBid = itemDAO.getMaxBid( item.getId() ); item.setWinningBid(winningBid); item.setBuyer( winningBid.getBidder() ); // Charge seller Payment payment = new Payment(item); paymentDAO.makePersistent(payment); // Notify seller and winner ... } ... }

Note Audit logs have the tendency to get quite large, quite rapidly, so a golden rule for auditing is to configure the bare minimum required to achieve the business task. Specifying to audit successes and failures on an active data folder for the Everyone group using Full Control (all permissions) would generate enormous audit logs that could affect the perfor mance of the server and would make locating a specific audited event all but impossible.

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The current Session is bound to the transaction that is started for the endAuction() method, and it s flushed and closed when this method returns. All code that runs inside this method and calls sessionFactory.getCurrentSession() gets the same persistence context. If you compare this example with the first nonworking example, listing 11.1, you ll see that you had to add only some annotations to make it work. The @TransactionAttribute is even optional it defaults to REQUIRED. This is why EJB 3.0 offers a simplified programming model. Note that you haven t used a JPA interface so far; the data access classes still rely on the current Hibernate Session. You can refactor this easily later concerns are cleanly separated. You now know how the persistence context is scoped to transactions to serve a particular event and how you can create more complex data-access operations that require propagation and sharing of a persistence context between several objects. Hibernate internally uses the current thread or the current JTA system transaction to bind the current Session and persistence context. The scope of the Session and persistence context is the same as the scope of the Hibernate Transaction or JTA system transaction. We now focus on the second design concept that can significantly improve how you design and create database applications. We ll implement long-running conversations, a sequence of interactions with the application user that spans user think-time.

One of the biggest challenges database developers face is how to optimize their indexes to obtain the most efficient query response. When developing indexes for database applications, the following guidelines should be considered:

You ve been introduced to the concept of conversations several times throughout the previous chapters. The first time, we said that conversations are units of work that span user think-time. We then explored the basic building blocks you have to put together to create conversational applications: detached objects, reattachment, merging, and the alternative strategy with an extended persistence context. It s now time to see all these options in action. We build on the previous example, the closing and completion of an auction, and turn it into a conversation.

Always look at the query plan first It will show you the optimal current execution plan from the query engine s point of view Find the most expensive part of the execution plan and start optimizing from there However, even before that, make sure that the statistics on all tables in your query are up-to-date by running the update statistics command on all tables in your query If you see table scan, optimize Table scan is the slowest possible way of execution Table scan means not only that no index is used, but that there is no clustered index for this table at all Even if you can only replace table scan with clustered index scan, it is still worth it If you see clustered index scan, find out whether it can be replaced with index seek For that, find the conditions applied to this table.

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