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00 and get the right answer, wouldn t it Well, suppose the uncommitted transaction was rolled back We have just counted $40000 that was never actually in the database The point here is that dirty read is not a feature; rather, it is a liability In Oracle, it is just not needed You get all of the advantages of a dirty read (no blocking) without any of the incorrect results..

The reason the field is the reverse of the property is that the default value for a SmartDate is that EmptyIsMin is True. Given that you can t initialize fields in a Structure, it is simpler to accept the default value for a Boolean, which is False. Hence the use of mEmptyIsMax as a field, since if it is False (the default), then EmptyIsMin is True by default.

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The READ COMMITTED isolation level states that a transaction may only read data that has been committed in the database. There are no dirty reads. There may be nonrepeatable reads (i.e., rereads of the same row may return a different answer in the same transaction) and phantom reads (i.e., newly inserted and committed rows become visible to a query that were not visible earlier in the transaction). READ COMMITTED is perhaps the most commonly used isolation level in database applications everywhere, and it is the default mode for Oracle databases. It is rare to see a different isolation level used.

SmartDate already has a field to control whether an empty date represents the largest or smallest possible date. This field is exposed as a property so that other code can determine how dates are handled: Public ReadOnly Property EmptyIsMin() As Boolean Get Return Not mEmptyIsMax End Get End Property SmartDate also implements an IsEmpty property so that code can ask if the SmartDate object represents an empty date: Public ReadOnly Property IsEmpty() As Boolean Get If Not mEmptyIsMax Then Return Me.Date.Equals(Date.MinValue) Else Return Me.Date.Equals(Date.MaxValue) End If End Get End Property Notice the use of the mEmptyIsMax flag to determine whether an empty date is to be considered the largest or smallest possible date for comparison purposes. If it is the smallest date, then it is empty if the date value equals DateTime.MinValue; if it is the largest date, it is empty if the value equals DateTime.MaxValue.

However, achieving READ COMMITTED isolation is not as cut-and-dried as it sounds. If you look at Table 7-1, it appears straightforward. Obviously, given the earlier rules, a query executed in any database using the READ COMMITTED isolation will behave in the same way, will it not It will not. If you query multiple rows in a single statement then, in almost every other database, READ COMMITTED isolation can be as bad as a dirty read, depending on the implementation. In Oracle, using multi-versioning and read-consistent queries, the answer we get from the ACCOUNTS query is the same in READ COMMITTED as it was in the READ UNCOMMITTED example. Oracle will reconstruct the modified data as it appeared when the query began, returning the answer that was in the database when the query started. Let s now take a look at how our previous example might work in READ COMMITTED mode in other databases you might find the answer surprising. We ll pick up our example at the point described in the previous table: We are in the middle of the table. We have read and summed the first N rows. The other transaction has moved $400.00 from account 123 to account 987. The transaction has not yet committed, so rows containing the information for accounts 123 and 987 are locked. We know what happens in Oracle when it gets to account 987 it will read around the modified data, find out it should be $100.00, and complete. Table 7-4 shows how another database, running in some default READ COMMITTED mode, might arrive at the answer. Table 7-4. Timeline in a Non-Oracle Database Using READ COMMITTED Isolation

namespace SocketUdpClientSample { public class Program { private const string dottedServerIPAddress = "127.0.0.1"; //use 255.255.255.255 for a broadcast private const int port = 2000; public static void Main() { using (Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp)) { // Addressing IPHostEntry entry = Dns.GetHostEntry dottedServerIPAddress); IPAddress ipAddress = entry.AddressList[0]; IPEndPoint serverEndPoint = new IPEndPoint(ipAddress, port); // Sending byte[] messageBytes = Encoding.UTF8.GetBytes("Hello World!"); clientSocket.SendTo(messageBytes, serverEndPoint); }// the socket will be closed here } } } Listing 6-5. A UDP Server using using using using using System; System.Net.Sockets; System.Net; System.Text; Microsoft.SPOT;

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