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In SQL:1999 constructor functions are used to create values of structured types A function with the same name as a structured type is a constructor function for the structured type For instance, we could declare a constructor for the type Publisher like this: create function Publisher (n varchar(20), b varchar(20)) returns Publisher begin set name = n; set branch = b; end We can then use Publisher( McGraw-Hill , New York ) to create a value of the type Publisher SQL:1999 also supports functions other than constructors, as we shall see in Section 96; the names of such functions must be different from the name of any structured type Note that in SQL:1999, unlike in object-oriented databases, a constructor creates a value of the type, not an object of the type That is, the value the constructor creates has no object identity In SQL:1999 objects correspond to tuples of a relation, and are created by inserting a tuple in a relation By default every structured type has a constructor with no arguments, which sets the attributes to their default values Any other constructors have to be created explicitly There can be more than one constructor for the same structured type; although they have the same name, they must be distinguishable by the number of arguments and types of their arguments An array of values can be created in SQL:1999 in this way: array[ Silberschatz , Korth , Sudarshan ] We can construct a row value by listing its attributes within parentheses For instance, if we declare an attribute publisher1 as a row type (as in Section 922), we can construct this value for it: ( McGraw-Hill , New York ) without using a constructor We create set-valued attributes, such as keyword-set, by enumerating their elements within parentheses following the keyword set We can create multiset values just like set values, by replacing set by multiset3 Thus, we can create a tuple of the type de ned by the books relation as: ( Compilers , array[ Smith , Jones ], Publisher( McGraw-Hill , New York ), set( parsing , analysis )).

Unlike site-to-site connections that go through three steps in Phase 1 to build a management connection (negotiate the policies, DH, and device authentication), with Easy VPN, peers can go through a total of seven steps Here are the seven steps Easy VPN can take when setting up the management connection during Phase 1: Step 1 The remote initiates the connection During this initiation, the remote is configured for either pre-shared keys or certificates for authentication If preshared keys are used, then Phase 1 will use aggressive mode; if certificates are used, then Phase 1 will use main mode Step 2 The remote sends a list of preconfigured Phase 1 policies These are defined in the Easy VPN remote software by Cisco, which the user and administrator have no control over This information includes which DH key group, authentication method (pre-shared or certificates), HMAC functions, and encryption algorithms to use This process reduces the configuration on the remote since users don t have to worry about the policies; however, on the server, you must have at least one policy that matches The server compares them in the order sent with the numerical order configured on the appliance Therefore, the most secure policy on the appliance should have the lowest priority number assigned to it Step 3 Diffie-Hellman (DH) is performed The remote generates the keys for the encryption and HMAC function, protects them, and sends them to the server Step 4 The two devices authenticate each other based on the authentication method configured/negotiated pre-shared keys or certificates

3 Although sets and multisets are not part of the SQL:1999 standard, the other constructs shown in this section are part of the standard Future versions of SQL are likely to support sets and multisets

The McGraw Hill Companies, 2001