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Protection of your data in the event of theft is the protection provided by encrypting data at rest. If someone steals your datafiles and they are encrypted, then the thief hasn t really succeeded in stealing anything at all. They have nothing more than a pile of seemingly random bits. Even SYSDBA access buys them nothing. If you have any sensitive information, information that if it fell into the wrong hands would spell a disaster, you must give consideration to encrypting data at rest. If the data is not encrypted, is not protected; it is extremely easy to extract information from the stolen datafiles. For example, suppose you have a table in some tablespace: ops$tkyte%ORA11GR2> create tablespace in_the_clear 2 datafile "/tmp/in_the_clear.dbf" size 1m 3 / Tablespace created. ops$tkyte%ORA11GR2> create table t 2 ( id varchar2(30) primary key, 3 ssn varchar2(11), 4 address varchar2(80), 5 credit_card varchar2(30) 6 ) 7 tablespace in_the_clear; Table created. ops$tkyte%ORA11GR2> insert into t (id, ssn, address, credit_card ) 2 values ( "Look for me", "123-45-6789", 3 "123 Main Street", "1234-5678-9876-5432" ); 1 row created. ops$tkyte%ORA11GR2> commit; Commit complete. At some point in time, the data that is currently in the buffer cache (this new row we inserted) would be placed on disk. We can force that to happen right now with a user invoked checkpoint: ops$tkyte%ORA11GR2> alter system checkpoint; System altered. Now, if someone were to gain access to that file, they would be able to get a lot of data from it without any Oracle software at all. For example, using the simple Unix utility strings, we can see: ops$tkyte%ORA11GR2> !strings -a /tmp/in_the_clear.dbf | egrep "(Look for me|123)" Look for me 123-45-6789 123 Main Street 1234-5678-9876-5432 It s all right there in clear text. Even if we stored some of these values in the Oracle NUMBER or DATE types, we know we could still read them. The NUMBER and DATE formats are explained in detail in 12 Datatypes. The data in an Oracle datafile is stored as is. Further, even if we deleted the data
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CSLA .NET has one configuration option to control authentication and it is set in the application s app.config or web.config file in the appSettings block: <add key="CslaAuthentication" value="Windows" /> This instructs CSLA .NET to rely on the .NET Framework and Windows to manage the current principal and identity objects. In other words, this tells CSLA .NET it doesn't have to deal with authentication and to just assume it has all been taken care of behind the scenes.
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A single generic class can implement covariant and contravariant interfaces for the same type, as shown in Listing 15-27. An instance of this class can be cast to either variant interface. Listing 15-27. A Generic Type That Implements Covariant and Contravariant Interfaces class GenericStack<T> : IPush<T>, IPop<T> { T[] dataArray = new T[10]; int currentPos = 0; public void Push(T value) { dataArray[currentPos++] = value; } public T Pop() { return dataArray[--currentPos]; } }
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Figure 10-6. A namespace is the set of type definitions that share the same namespace name.
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At an abstract level, web services enable one application to call procedures or methods in another application. On the face of it, this is similar to the aims of Remote Procedure Call (RPC), DCOM, Remote Method Invocation (RMI), Internet Inter-ORB Protocol (IIOP), and .NET Remoting all of these technologies enable one application to invoke procedures in another application.
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AppendFormat(string, object) AppendFormat(string,params object) Capacity
Figure 2-4. A Windows form referencing a business object How does the event get delivered to the handling object It turns out that behind every event is a delegate a strongly typed reference that points back to the handling object. This means that any object that raises events can end up with bidirectional references between the object and the other object/entity that is handling those events, as shown in Figure 2-5.
Oracle provides 22 different SQL data types. Briefly, they are as follows: CHAR: A fixed-length character string that will be blank padded with spaces to its maximum length. A non-null CHAR(10) will always contain 10 bytes of information using the default National Language Support (NLS) settings. We will cover NLS implications in more detail shortly. A CHAR field may store up to 2,000 bytes of information. NCHAR: A fixed-length character string that contains UNICODE formatted data. Unicode is a character-encoding standard developed by the Unicode Consortium with the aim of providing a universal way of encoding characters of any language, regardless of the computer system or platform being used. The NCHAR type allows a database to contain data in two different character sets: the CHAR type and NCHAR type use the database s character set and the national character set, respectively. A non-null NCHAR(10) will always contain 10 characters of information (note that it differs from the CHAR type in this respect). An NCHAR field may store up to 2,000 bytes of information. VARCHAR2: Also currently synonymous with VARCHAR. This is a variable length character string that differs from the CHAR type in that it is not blank padded to its maximum length. A VARCHAR2(10) may contain between 0 and 10 bytes of information using the default NLS settings. A VARCHAR2 may store up to 4,000 bytes of information.
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A workflow built with the SharePoint Designer (SPD) consists of one or more steps. Each step defines the conditions and actions that control the activities of that step. For example, a step in an approval workflow might be as follows: If the cost is greater than $10,000, assign a task to the department manager to review and approve. In the Workflow Designer, the steps of your workflow are shown as a list on the right side, as shown in Figure 4-1.
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