Simple .NET/ASP.NET PDF document editor web control SDK

In the previous section, you saw how you can make a soft parse softer by using session cursor cache. Before 10g, the PL/SQL language cached only static cursors (excluding ref cursors), thus allowing you to avoid subsequent soft parses completely in such cases. Starting with 10g, PL/SQL also caches native dynamic SQL (which uses execute immediate syntax) in a loop, assuming that the exact same statement is being executed for each iteration in the loop (i.e., the statement is not changing for different iterations) and the compiler can determine this at compile time. PL/SQL avoids soft parses by performing a soft close on the cursor. In other words, when you close a cursor explicitly (e.g., by using the close command) or implicitly (e.g., when the cursor goes out of scope in the for loop in which it was defined), PL/SQL does not actually close the cursor it caches it in its own separate cursor cache, hoping that your application will reuse the cursor in its next attempt. Of course, if the maximum limit for opened cursors is about to be reached, then it closes the cursor for real. The beauty of this feature is that for the class of cursors for which it is applicable, you can avoid soft parses completely!

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Note As of Oracle 10g Release 1, the PL/SQL cursor cache does not cache ref cursors. Ref cursors can be tricky to cache, since they can point to a different cursor during the same execution, as presented earlier. They can also escape to a client such as a JDBC program, in which case you no longer control the cursor (the JDBC client controls it). Recall, however, that ref cursors are cached by session cursor cache. Session cursor caches go through a softer soft parse during which they validate their cursor anyway; hence, it makes sense for ref cursors to be cached in session cache.

Summary

So far, so simple. One real advantage of this approach comes as you write combinators that put these together in useful ways. For example for tuples: let tup2P p1 p2 (a, b) (st: outstate) = (p1 a st : unit) (p2 b st : unit) let tup3P (p1 a (p2 b (p3 c p1 st st st p2 p3 (a, b, c) (st: outstate) = : unit) : unit) : unit)

Let s now look at the PL/SQL cursor in action. We will, in fact, compare it to a loop similar to the one we executed earlier while benchmarking session cached cursors. We will use the same schema that we created: the one consisting of table t1 with one number column containing 10,000 rows, each a number from 1 to 10,000. This time, we will use the runstats package and PL/SQL code to demonstrate the concept. First, we set session_cached_cursors to a value of 500 and execute the runstats_pkg.rs_ start() method, followed by the same loop that we executed in our tests for demonstrating session cached cursors. In this case, the PL/SQL cache does not come into the picture because we use a ref cursor. benchmark@ORA10G> alter session set session_cached_cursors=500; Session altered. benchmark@ORA10G> exec runstats_pkg.rs_start PL/SQL procedure successfully completed. benchmark@ORA10G> benchmark@ORA10G> declare 2 l_cursor sys_refcursor; 3 begin 4 for i in 1..10000 5 loop 6 open l_cursor for 7 select x 8 from t1 9 where x = i; 10 close l_cursor; 11 end loop; 12 end; 13 / PL/SQL procedure successfully completed.

let tup2U p1 p2 (st: instate) = let a = p1 st let b = p2 st (a, b) let tup3U p1 p2 p3 (st: instate) = let a = p1 st let b = p2 st let c = p3 st (a, b, c) and for lists: // Outputs a list into the given output stream by pickling each element via f. let rec listP f lst st = match lst with | [] -> byteP 0uy st | h :: t -> byteP 1uy st; f h st; listP f t st

Component Services exposes a rich set of features that you can consume from .NET by having your types inherit from ServicedComponent and decorating your types with attributes that determine how they ll be configured when they re registered with COM+. Because this is still a COM-based technology, a layer of interop is used; therefore, you must be sure the benefits of the features you re leveraging outweigh the performance hit you ll incur by using the environment. Many of the features of COM+, when needed, will be worth this performance hit. Once your components are created and configured within COM+, calling processes will need to get to them. This may happen in process from IIS, it may happen via DCOM from a Windows Forms application, or it may happen via Web Services. In the next chapter, we ll examine some of the different options that are available for invoking Serviced Components from within different application architectures.