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The architecture for large or slow data sets requires a server component that supports multithreading or multiprocesses, and a client component that includes a two-channel communication mechanism. The architecture is laid out in Figure 6-2.

As we saw in the body of the chapter, the single-assignment version of the SQL SET statement takes the form SET target = source ; The target can be a variable or a pseudovariable16 We consider the variable case first Here are some examples First a self-explanatory scalar example: DECLARE I INTEGER ; SET I = 0 ; Note: All DECLARE statements shown in this appendix are SQL statements specifically (ie, they have the effect of defining some SQL variable) Like SET, DECLARE was introduced into the SQL standard as part of the Persistent Stored Modules feature, SQL/PSM.

However, developers will sometimes use unusual permissions such as 606, which give write access to only the owner (probably root) and everybody, which is the user running the Apache process according to what they are attempting to accomplish If you do not have a specific reason to use something other than 755, it s a good idea to stick with this permission level..

Next, an array example: DECLARE H INTEGER ARRAY [10] ; DECLARE K INTEGER ARRAY [10] ; SET H = K ; Note carefully that the SET statement here is indeed a single assignment (see the discussion of this issue in the section A Little History in the body of the chapter) It s also a nonscalar assignment Incidentally, though it s not relevant to our main purpose in this chapter, we remark that arrays in SQL are varying-length ; thus, the two [10] s in the declarations of H and K each define an upper bound, and the variables can each contain any number N of elements (N 0), up to but not greater than that upper bound And if, for example, the variable H currently contains exactly three elements, then those elements are precisely H[1], H[2], and H[3].

To make sharing files to the Web easy, Apache will, by default, serve all files that it can access to any user who tries to access it. Any files within a path to a web site or any files available using symbolic links within the web site code are accessible through Apache. This makes limiting access to files available to the Apache user an important aspect of web server security. One way to mitigate this issue is to deny access to the file system and allow access only to the document root using the httpd.conf file. By adding the following code to the httpd.conf file, any access other than that granted by this line would be denied:

Third and last, a row example: DECLARE NAME ROW ( FIRST VARCHAR(25), LAST VARCHAR(25), MI CHAR(1) ) ; SET NAME = ROW ( 'Truman', 'Harry', 'S' ) ; Again the SET statement here is a single, nonscalar assignment (in fact it s SQL s counterpart to Tutorial D s <tuple assign>, which was mentioned in the body of this chapter, though not discussed in detail) The expression on the right side is a row value constructor The keyword ROW is optional in such constructors..

Figure 6-2. Large and slow data set architecture The architecture shown in Figure 6-2 is an example historical ticker application. The client has two interactions: HTTP POST and HTTP GET to the same URL, /services/historical/*. At a technical level, the two interactions are separate, but they often work together. The POST interaction is used to send data, and the GET interaction is used to retrieve data. Technically, a REST Web service implies such an interaction: to start a task, a POST request is sent, and the answers for the task are retrieved using a GET. Two channels are used so that the client can receive multiple answers to an executing task. This ability is a necessity when you are working with large or slow data sets. You cannot

<Directory /> Order Deny,Allow Deny from all </Directory> <Directory /Library/WebServer/Documents> Order Allow,Deny Allow from All </Directory>

16. It can also be a parameter (within the body of some procedure). And in certain kinds of triggered procedures it can be specified as a column reference, in which case SET can be used to achieve a database updating effect after all (albeit only indirectly).