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Using HTTPS mitigates man-in-themiddle and replay attacks. This is optional during development, but be sure to use HTTPS in production environments. RETRIEVAL: THE BASICS
You are configuring NTFS file permissions for a website with the following Web.config file: OUTER
the FileStream object . In a garbage-collected environment, new objects are allocated contiguously in memory, providing performance gains resulting from locality of reference . Specifically, this means that your process s working set will be smaller than a similar application running in a non-managed environment . It s also likely that the objects that your code is using can all reside in the CPU s cache . Your application will access these objects with phenomenal speed because the CPU will be able to perform most of its manipulations without having cache misses that would force slower access to RAM . So far, it sounds as if the managed heap is far superior to the C-runtime heap because of its simplicity of implementation and speed . But there s one little detail you should know about before getting too excited . The managed heap gains these advantages because it makes one really big assumption: that address space and storage are infinite . Obviously, this assumption is ridiculous, and the managed heap must employ a mechanism to allow it to make this assumption . This mechanism is the garbage collector . Here s how it works: When an application calls the new operator to create an object, there might not be enough address space left in the region to allocate to the object . The heap detects this lack of space by adding the bytes that the object requires to the address in NextObjPtr . If the resulting value is beyond the end of the address space region, the heap is full, and a garbage collection must be performed . Important What I ve just said is an oversimplification . In reality, a garbage collection occurs Note To specify a single-element grouping set, the parentheses are optional. (A one-element grouping set means the same as a simple group by item.) If you simply list elements directly within the outer pair of parentheses of the GROUPING SETS clause itself, as opposed to listing them within an inner pair of parentheses, you get a separate grouping set made of each element. For example, GROUPING SETS( a, b, c ) de nes three grouping sets: one with the element a, one with b and one with c. GROUPING SETS( (a, b, c) ) de nes a single grouping set made of the elements a, b, c. As you can see in the output of the query, NULLs are used as placeholders in inapplicable attributes. You could also think of these NULLs as indicating that the row represents an aggregate over all values of that column. This way, SQL Server can combine rows associated with different grouping sets to one result set. So, for example, in rows associated with the grouping set (custid, YEAR(orderdate)), the empid column is NULL. In rows associated with the empty grouping set, the columns empid, custid, and orderyear are NULLs and so on. Compared to a query that uni es the result sets of four GROUP BY queries, our query that uses the GROUPING SETS subclause requires much less code. It has a performance advantage as well. Examine the execution plan of this query shown in Figure 8-3. becoming ever more complex and tiresome, and decided some fun had to be injected into the world of programming languages. Caution
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