asp.net mvc qr code generator Figure 2-4. Compilation in VS .NET

Creation QR Code in VS .NET Figure 2-4. Compilation

Figure 2-4. Compilation
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It is important to be aware that compilation and execution are distinct phases of query processing and that the gap between when SQL Server compiles a query and when the query is executed can be as short as a few microseconds or as long as several days. An ad-hoc query usually doesn't have its plans in the cache when it is processed; therefore, it is compiled and its plan is immediately executed. On the other hand, the compiled plan for a frequently executed stored procedure might reside in the procedure cache for a very long time because SQL Server removes the infrequently used plans from the procedure cache first if the storage space is required for other purposes, including storing new query plans. The optimizer is taking into account how many CPUs are available for SQL Server and the amount of memory that is available for query execution. However, the number of CPUs available to execute the query and the amount of available memory can change dramatically from moment to moment. You really have to think of compilation and execution as two separate activities, even when you are submitting an ad-hoc SQL statement through SSMS and executing it immediately. When SQL Server is ready to process a batch, an execution plan for the batch might already be available in SQL Server's cache. If not, the compiler compiles the batch and produces a query plan. The compilation process encompasses a few things. First, SQL Server goes through the phases of parsing and binding . Parsing is the process of checking the syntax and transforming your SQL batch into a parse tree. Parsing is a generic operation used by compilers for almost all programming languages. The only specific thing in SQL Server's parser is its own grammar for defining valid T-SQL syntax. Parsing includes checking, for example, whether a nondelimited table or column name starts with a digit. The parser flags an error if one is found. However, parsing does not check whether a column used in a WHERE clause really exists in any of the tables listed in the FROM clause; that issue is dealt with during binding. The binding process determines the characteristics of the objects that you reference inside your SQL statements, and it checks whether the semantics you're asking for make sense. For example, while a query including FROM A JOIN B may be parsed successfully, binding will fail if A is a table and B is a stored procedure. Optimization is the last step in the compilation. The optimizer has to translate the nonprocedural request of a set-based SQL statement into a procedure that can execute efficiently and return the desired results. Similar to binding, optimization is performed one statement at a time for all statements in the batch. After the compiler generates the plan for the batch and stores the plan in the procedure cache, a special copy of the plan's execution context is executed. SQL Server caches the execution contexts much like it does with the query plans, and if the same batch starts the second execution before the first one is finished, SQL Server will create the second execution context from the same plan. You can learn more about the SQL Server procedure cache from Inside Microsoft SQL Server 2005: Query Tuning and Optimization (Microsoft Press, 2006) by Kalen Delaney or from the white paper "Batch Compilation, Recompilation, and Plan Caching Issues in SQL Server 2005" at http://www.microsoft.com/technet/prodtechnol/sql/2005/recomp.mspx#EJAA . SQL Server does not optimize every statement in the batch. It optimizes only certain classes of statements: those that access database tables and for which there might be multiple execution choices. SQL Server optimizes all DML (data manipulation language) statementsthese are SELECT, INSERT, DELETE, and UPDATE statements. In addition to the DML, some other T-SQL statements are optimized; CREATE INDEX is one of them. Only the optimized statements will produce query plans. The following example shows that the optimizer creates a plan for CREATE INDEX: CREATE TABLE dbo.T(a INT, b INT, c INT, d INT); INSERT INTO dbo.T VALUES(1, 1, 1, 1); SET STATISTICS PROFILE ON; -- forces producing showplan from execution
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CREATE INDEX i ON dbo.T(a, b) INCLUDE(c, d); SET STATISTICS PROFILE OFF; -- reverse showplan setting DROP TABLE dbo.T; -- remove the table
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It will produce this optimized query plan: insert [dbo].[T] select *, %%bmk%% from [dbo].[T] |--Index Insert(OBJECT:([db].[dbo].[T].[i])) |--Sort(ORDER BY:([db].[dbo].[T].[a] ASC, [db].[dbo].[T].[b] ASC, [Bmk1000] ASC)) |--Table Scan(OBJECT:([db].[dbo].[T]))
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Similar to the CREATE INDEX statement, CREATE STATISTICS, UPDATE STATISTICS, and some forms of ALTER INDEX are also optimized. Several statements executed internally to perform database checking in DBCC CHECKDB are optimized as well. However, be aware that out of these non-DML optimized statements only CREATE INDEX produces a showplan with a statistics profile and none of them produces a query plan directly in SSMS. (Showplans will be explained later in the "Working with the Query Plan " section.)
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