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Before a query is executed, a set of preparation routines known as the optimizer begins analyzing the columns and operations in the request, to calculate the fastest way to respond. It starts by looking for indexes on the tables and columns involved. Working its way through a sequence of cost-based decision paths, it develops a plan a kind of road map for the route it will follow when it actually executes the query. The final plan it chooses reflects the cheapest route it can predict according to the indexes it can use. The optimizer s plan can be viewed in an isql shell session in two ways: By default, isql does not display the plan. Use SET PLAN ON to have the plan displayed at the top of the output from a SELECT query. Use SET PLANONLY to submit queries and view the plans without actually running the queries. This enables you to inspect the plan for any query, not just SELECT queries. It is possible to override the optimizer s plan with one of your own, by including a PLAN clause in your query statement. Most third-party GUI tools provide the ability to view the plan, with or without running the query, and to override it.

{ try { IRoleClassSecurity classObj = new DniScRoleClassSecurityObj(); CallClassSecurityObj(classObj); IRoleMethodSecurity obj = new DniScRoleMethodSecurityObj(); CallUnsecuredMethod(obj); CallSecuredMethod(obj); } catch (Exception e) { Console.WriteLine( "Exception during creation: {0}", e.Message); } Console.Read(); } static void CallClassSecurityObj(IRoleClassSecurity obj) { try { int result = obj.SecuredMethod("abcdefg"); Console.WriteLine( "Class security method result: {0}", result); } catch (Exception e) { Console.WriteLine( "Exception using secured class: {0}", e.Message); } } static void CallSecuredMethod(IRoleMethodSecurity obj) { try { int result = obj.SecuredMethod("abcdefg"); Console.WriteLine( "SecuredMethod result: {0}", result); }

Do not override the optimizer s plan unless you have tested your own and found it to be consistently faster on realistic data.

For more information about query plans, refer to the Optimization Topic in 20. For details about using isql, refer to 37.

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Naturally, it is handy to have a single value returned from a function, and it is even more helpful in some instances to have a function return multiple values. Since the return statement is really set up to return only a single value, you can get a little tricky and pass an array of items for use. If you want to get even more involved, you can return entire objects from a function, thus allowing you to pass back whatever values were associated with the object. Through some careful manipulation, you can use functions to return whatever it is you need returned from them. The following example is a function that allows you to return an array of values, thus getting around the problem of being able to return only a single value.

If the optimizer decides to use an index, it searches the pages of the index to find the key values required and follows the pointers to locate the indicated rows in the table data pages. Data retrieval is fast because the values in the index are ordered. This allows the system to locate wanted values directly, by pointer, and avoid visiting unwanted rows at all. Using an index typically requires fewer page fetches than walking through every row in the table. The index is small, relative to the row size of the table and, provided the index design is good, it occupies relatively fewer database pages than the row data.

When the columns specified in an ORDER BY or GROUP BY clause are indexed, the optimizer can sequence the output by navigating the index(es) and assemble the ordered sets more directly than it can with non-indexed reads.

catch (Exception e) { Console.WriteLine( "Exception calling SecuredMethod: {0}", e.Message); } } static void CallUnsecuredMethod(IRoleMethodSecurity obj) { try { int result = obj.UnsecuredMethod("abcdefg"); Console.WriteLine( "UnsecuredMethod result: {0}", result); } catch (Exception e) { Console.WriteLine( "Exception calling UnsecuredMethod: {0}", e.Message); } } } } Before running this test, we remove the user or group assignment that we made to the AppManager role. When we run the test, we get these results: Exception using secured class: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)) UnsecuredMethod result: 7 Exception calling SecuredMethod: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)) The call to UnsecuredMethod worked since it required role AppUser. This role is currently assigned the Everyone group, so any user can access this method. The call to SecuredMethod failed because it requires the AppManager role and it is once again empty. If we add our user or group back to the AppManager role and run the test again, we now see that we have access to all methods: Class security method result: 7 UnsecuredMethod result: 7 SecuredMethod result: 7

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