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This situation can occur if the transaction contained a series of operations that were written to disk through a flush some time during the transaction s execution through normal database operations and operating system timing but a failure occurred before the executing connection closed properly, or before an explicit COMMIT was received and written as a log record For UNDO functionality, the log records must contain both the old (original) value and the new value for the data being modified UNDO functionality is sometimes called roll-backward recovery These logs are the glue between the old state of the database contained in secondary storage and the newest state that existed in memory before a failure, as Figure 3-6 indicates..

{ Products _myDataSet = new Products();

... public List<string> GetAnimations() { List<string> list = new List<string>(); foreach (string animation in agentChar.AnimationNames) { list.Add(animation); } return list; } public void Animate(string animation) { agentChar.StopAll(null); agentChar.Play(animation); } ...

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So, we have a logging mechanism recording all the actions that are occurring on our database system, writing ahead of the changes to the data page buffer pool to ensure that we have a permanent record of the changes made to the system. During the recovery process, the log records are used to reconstruct the state of the data store to its most current state, meaning all data modifications that succeeded for transactions that had been marked with a COMMIT. Indeed, there are points in time when a database s data is, at least partially, considered stable. The current data pages have been flushed to disk, even if modifications are going on in the background, with the log files picking up any changes before they actually occur in memory. These moments in time are called checkpoints, and they are actually written as special log records in the log file to indicate that all data pages in memory (buffers) at the time of the checkpoint have been flushed to disk (made permanent). In standard checkpointing, it is customary to include in the checkpoint record a list of transaction identifiers that are active (currently executing) at the time the checkpoint occurred. These checkpoints enable the recovery process to reduce the amount of transaction log records it needs to read and use to re-create the database, because they indicate that the state of the secondary storage at the checkpoint is current, except for any uncommitted transactions at the time of the checkpoint.

Tip Beware of animations that have the word left or right in them. These refer to the character s left

this.pRODUCTSTableAdapter.Fill(_myDataSet.PRODUCTS); //Create and add a new product to the DataSet Products.PRODUCTSRow _newProduct = _myDataSet.PRODUCTS.NewPRODUCTSRow(); _newProduct.ID = "C5"; _newProduct.NAME = "Cleaner Fluid"; _newProduct.PRICE = 250; _newProduct.REMARKS = "Added via a strong typed dataset"; _myDataSet.PRODUCTS.AddPRODUCTSRow(_newProduct); int _Result = this.pRODUCTSTableAdapter.Update(_myDataSet); MessageBox.Show(_Result.ToString() + " rows updated in Products table"); } When you typed the code in Listing 15-1, you would have realized a few things: Column and table names would instantly appear in the IntelliSense pop-up windows. This makes the locating of table columns easier and cuts out human error (for example, specifying the wrong table column name). The NULL check functions are readily available for each column in the DataSet. All columns are strongly typed. For instance, you cannot assign a string object to a numerical-based column. This lets you detect data mismatch errors at compile time rather than at run time.

and right, not your right and left. For example, if you use the GestureLeft animation, the agent will point to its right.

you if MySQL is using particular caches effectively. Throughout the course of this book, as the topics dictate, we cover most of the status counters and their various meanings, and provide some insight into how to interpret changes in their values over time.

If you run the form and click the button, you will see the pop-up message shown in Figure 15-15, denoting that the row was successfully inserted into the Products table.

Finally, the Dispose() method makes sure the agent is properly cleaned up: ... public void Dispose() { if (agentChar.Visible) { agentChar.StopAll(null); agentChar.Hide(null); } } } To try this out, create a form, add the Microsoft Agent control, and then create an instance of the AgentController. For example, the AgentTryout project uses the following code to create the agent and fill a list control with a list of supported animations:

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