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An audit log is a database table that contains information about changes made to other data, specifically about the event that results in the change. For example, we might record information about creation and update events for auction Items. The information that s recorded usually includes the user, the date and time of the event, what type of event occurred, and the item that was changed. Audit logs are often handled using database triggers, and we think this is an excellent approach. However, it s sometimes better for the application to take responsibility, especially if portability between different databases is required. You need to perform several steps to implement audit logging:

Let s give these variables initial values in the InitializeSystem method, where the code already initializes some other values. Add the following statements to that routine in the General module.

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Applications need to use computer memory in order to run, and SQL Server is no exception. You may find yourself having memory pressure that is either physical or virtual in nature, and in both cases the pressure may be internal or external. Before you dive into such details, you need to be able to determine if memory pressure even exists. Just because SQL Server is consuming memory does not mean that there is a problem. I like to set the memory for my database servers to be the same fixed size for both the maximum and minimum memory configurations. On a dedicated database server, I will leave just enough memory for the base operating system to function, typically 2 3GB, and assign the rest to SQL Server. This can result in a situation where your phone will ring and the voice on the other end will say SQL is consuming a lot of memory, please do something to fix the situation. Of course there is nothing for you to fix, because you have configured it to operate that way! If the SQL service is indeed operating at or near capacity then you may start to see error messages that pertain to memory. If you recall, I already talked about how SQL will swap data pages between memory and disk. The area of memory used is called the buffer pool. Reading from memory is faster than reading from disk, so the more you can store in the buffer pool the faster your performance will be. But when your server is under memory pressure, your buffer pool will not be able to handle the increase in requests, and performance will degrade. That s when your phone will ring.

static string[] AddNumbers(IEnumerable<string> names) { List<string> numberedNames = new List<string>(); int i = 0; foreach (string currentName in names) { numberedNames.Add(string.Format("{0}: {1}", i, currentName)); i += 1; } return numberedNames.ToArray(); }

from Bid bid join bid.item item where item.category.name like 'Laptop%' and item.successfulBid.amount > 100

Expand the Wedding Preparations activity and drag a Parallel activity onto it. Set its DisplayName property to Planning Activities. In this workflow, you ll design three sequences of activities that will execute simultaneously. Drag three CompensableActivity objects onto the Parallel activity and set their DisplayName property to Wedding, Reception, and Invitation. The designer should look like the one shown in Figure 17-5.

import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import javax.microedition.rms.*; public class ObtainQuoteMIDlet extends MIDlet { private Display displayMngr = null; private EntryForm entryForm = null; private Alert resultsAlert = null; private Ticker adTicker = new Ticker("Track your investments with Investment Tracker"); public ObtainQuoteMIDlet () { } private void initListener () { ItemStateListener itemListener = new ItemStateListener () { public void itemStateChanged (Item item) { if ((item == entryForm.getInvestmentChoice()) && (entryForm.getInvestmentChoice().getSelectedIndex() == 1) && !(entryForm.getSymbolField().getString().toUpperCase(). endsWith("X"))) { Alert symbolAlert = new Alert("Check Symbol", "Mutual Funds end in 'X'", null, AlertType.WARNING); symbolAlert.setTimeout(Alert.FOREVER); displayMngr.setCurrent(symbolAlert, entryForm); } } }; CommandListener commandListener = new CommandListener() { public void commandAction(Command c, Displayable d) { if (c == entryForm.getExitCommand()) { destroyApp(true); } else if (c == entryForm.getGetCommand()) { if ((entryForm.getInvestmentChoice().getSelectedIndex() == 1) && !(entryForm.getSymbolField().getString().toUpperCase(). endsWith("X"))){ Alert symbolAlert = new Alert("Check Symbol", "Mutual Funds end in 'X'", null, AlertType.WARNING); symbolAlert.setTimeout(Alert.FOREVER); displayMngr.setCurrent(symbolAlert, entryForm); } else if (entryForm.getSymbolField().getString().length() > 0) { String sym = entryForm.getSymbolField().getString(); int type = entryForm.getInvestmentChoice().getSelectedIndex(); int[] price = QuoteService.getPrice(sym, type); if (price != null) { storePrice(sym, price); displayPrice("The price of " + sym + " is $" + price[0] + "." + price[1]); } else { Alert symbolAlert = new Alert("Check Symbol/Type", "No quote found.", null, AlertType.WARNING); symbolAlert.setTimeout(Alert.FOREVER);

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