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We ve been talking about EntityManager flushing on and off throughout the chapter. It is time we discussed this concept fully. For the most part, you ll probably be able to get away without knowing too much about this EntityManager feature. However, there are some situations where not understanding EntityManager flushing could be a great disadvantage. Recall that EntityManager operations like persist, merge, and remove do not cause immediate database changes. Instead, these operations are postponed until the EntityManager is flushed. The true motivation for doing things this way is performance optimization. Batching SQL as much as possible instead of flooding the database with a bunch of frivolous requests saves a lot of communication overhead and avoids unnecessarily tying down the database. By default, the database flush mode is set to AUTO. This means that the EntityManager performs a flush operation automatically as needed. In general, this occurs at the end of a transaction for transaction-scoped EntityManagers and when the persistence context is closed for application-managed or extendedscope EntityManagers. In addition, if entities with pending changes are used in a

Redo log files are crucial to the Oracle database. These are the transaction logs for the database. Oracle maintains two types of redo log files: online and archived. They are used for recovery purposes; their purpose in life is to be used in the event of an instance or media failure. If the power goes off on your database machine, causing an instance failure, Oracle will use the online redo logs to restore the system to exactly the committed point it was at immediately prior to the power outage. If your disk drive fails (a media failure), Oracle will use both archived redo logs and online redo logs to recover a backup of the data that was on that drive to the correct point in time. Moreover, if you accidentally truncate a table or remove some critical information and commit the operation, you can restore a backup of the affected data and recover it to the point in time immediately prior to the accident using online and archived redo log files. Archived redo log files are simply copies of old, full online redo log files. As the system fills up log files, the ARCH process makes a copy of the online redo log file in another location, and optionally puts several other copies into local and remote locations as well. These archived redo log files are used to perform media recovery when a failure is caused by a disk drive going bad or some other physical fault. Oracle can take these archived redo log files and apply them to backups of the data files to catch them up to the rest of the database. They are the transaction history of the database.

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Notice that we map this property insert="false" update="false" to indicate that it isn t to be included in SQL INSERTs or UPDATEs. After saving a new Item, Hibernate won t be aware of the value assigned to this column by the trigger, since it occurs after the INSERT or the item row. If we need to use the value in our application, we have to tell Hibernate explicitly to reload the object with a new SQL SELECT. For example:

3. Enter the query as shown in Figure 3-3, then click Execute (or press F5, or select Query Execute).

The RefreshPivot macro stores your password, and then uses it when unprotecting and protecting the worksheet. While the worksheet is unprotected, it refreshes the pivot table.

The purpose of the Clear button is to clear any checked boxes in the source TreeView. Given the SetCheck( ) method that you developed earlier, handling the Clear button s Click event is trivial. In the Design tab, double-click on the Clear button to create its default event handler (Click). Then add this bit of code to the handler:

private CustomIdentity() { /* require use of factory methods */ } [Serializable()] private class Criteria { private string _username; public string Username { get { return _username; } } private string _password; public string Password { get { return _password; } } public Criteria(string username, string password) { _username = username; _password = password; } } internal static CustomIdentity { return new CustomIdentity(); } UnauthenticatedIdentity()

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