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The RECOMPILE option tells SQL Server to create a new execution plan every time it is invoked . This option actually tells SQL Server not to bother to cache the plan, hence every invocation of the procedure ends up creating a new plan because it won t find an existing one . It is especially useful when the cost of the recompiles is lower than the extra cost associated with reusing suboptimal plans . First, run the altered procedure specifying an input with high selectivity: org.jdom.*; java.io.*; javax.servlet.*; javax.servlet.http.*; EXEC dbo.GetOrders '20080506'; vb.net upc-a reader VB . NET UPC-A Barcode Reader SDK - Decode & Scan UPC-A ...
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Background. I originally built this application in VB . NET . While I was learning C#. ... To test this application, I bought a barcode scanner from Ebay for 5 dollars, ... You get the plan shown earlier in Figure 3-1, which is optimal in this case and generates an I/O cost of 10 logical reads . Next, run it specifying an input with low selectivity: 1 2 3 4 5 6 7 8 9 10 EXEC dbo.GetOrders '20060101'; /** * The stock watchlist servlet with XSLT */ public class WatchListServlet extends HttpServlet { private ListBuilder builderInterface = new ListBuilder(); private ServletConfig config; private ServletContext context; You get the plan in Figure 3-2, showing a table scan (unordered clustered index scan), which is optimal for this input . The I/O cost in this case is 21 logical reads . FiguRe 3-2 Execution plan showing a table scan (unordered clustered index scan) birt data matrix, word pdf 417, word code 39 barcode font download, qr code microsoft word 2013, birt report qr code, birt code 39 vb.net upc-a reader .NET Barcode Reader Library | C# & VB . NET UPC-A Recognition ...
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NET UPC-A Generator, Creating and Adding UPC-A in VB . NET , ASP.NET Web Forms and Windows Forms applications, with detailed Developer Guide. As mentioned, when creating a stored procedure with the RECOMPILE option, SQL Server doesn t even bother to keep the execution plan for it in cache . If you now query sys.syscacheobjects, you will get no plan back for the GetOrders procedure: public WatchListServlet() { super(); } public void init(ServletConfig config) throws ServletException { this.config = config; this.context = config.getServletContext(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(false); if (session == null) { context.getRequestDispatcher("/login.jsp") .forward(request, response); return; } String userId = (String) session.getAttribute("userId"); Document quoteList = builderInterface.getWatchList(userId); request.setAttribute("quoteList", quoteList); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } SELECT cacheobjtype, objtype, usecounts, sql FROM sys.syscacheobjects WHERE sql NOT LIKE '%sys%' AND sql LIKE '%33145F87-1109-4959-91D6-F1EC81F8428F%'; vb.net upc-a reader UPC-A VB . NET DLL - Create UPC-A barcodes in VB . NET with valid ...
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RasterEdge . NET Image SDK contains a barcode reading plug-in library which can efficiently add UPC-A barcode scanning & detecting ability into your VB . You can see that the optimizer chose a table scan (unordered clustered index scan) because of its selectivity estimation of 30 percent (249 .3 rows/831 total number of rows), although in actuality only one row was returned . You can tackle this problem in several ways . One is to use, whenever possible, inline expressions in the query that refer to the input parameter instead of a variable . In our case, it is possible: ALTER PROC dbo.GetOrders @d AS INT = 0 AS SELECT orderid, custid, empid, orderdate FROM Sales.Orders WHERE orderdate >= DATEADD(day, -@d, CONVERT(VARCHAR(8), CURRENT_TIMESTAMP, 112)); GO Run GetOrders again, and notice the use of the index on orderdate in the execution plan: Building the filter Our filter implementation is a class that implements the javax.servlet.Filter interface. The J2EE web container invokes the filter based on URL pattern matching, as it does with servlets. When a filter matching a specific URL pattern is found, the container invokes its doFilter method, the signature of which is as follows: EXEC dbo.GetOrders; The plan that you get is similar to the one shown earlier in Figure 3-1 . The I/O cost here is just four logical reads . Another way to deal with the problem is to use a stub procedure that is, create two procedures . The first procedure accepts the original parameter, assigns the result of the calculation to a local variable, and invokes a second procedure providing it with the variable as input . The second procedure accepts an input order date passed to it and invokes the query that refers directly to the input parameter . When a plan is generated for the procedure that actually invokes the query (the second procedure), the value of the parameter will, in fact, be known at optimization time . Run the following code to implement this solution: IF OBJECT_ID('dbo.GetOrdersQuery', 'P') IS NOT NULL DROP PROC dbo.GetOrdersQuery; GO CREATE PROC dbo.GetOrdersQuery @odate AS DATETIME AS SELECT orderid, custid, empid, orderdate FROM Sales.Orders WHERE orderdate >= @odate; GO ALTER PROC dbo.GetOrders @d AS INT = 0 AS public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException; vb.net upc-a reader VB . NET UPC-A barcode Generator - ASP.NET Barcode Reader
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