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In the row-by-row procedure, we open a cursor that selects the 100,000 rows from all_objects. We fetch each row and insert the row into t1: benchmark@ORA92I> create or replace procedure row_by_row 2 as 3 begin 4 for i in ( select rownum from all_objects, all_users where rownum <= 100000 ) 5 loop 6 insert into t1(x) values(i.rownum); 7 end loop; 8 end; 9 / Procedure created. In the single_stmt_insert procedure, we do the same thing using a single insert into select clause: benchmark@ORA92I> create or replace procedure single_stmt_insert 2 as 3 begin 4 insert into t1 5 select rownum 6 from all_objects, all_users 7 where rownum <= 100000; 8 end; 9 / Procedure created. We first execute the row_by_row procedure: benchmark@ORA92I> exec row_by_row PL/SQL procedure successfully completed. We next print out the undo generated by this procedure by invoking the function get_undo, which was discussed earlier: benchmark@ORA92I> exec dbms_output.put_line( get_undo ); 7069696 PL/SQL procedure successfully completed. benchmark@ORA92I> select count(*) from t1; 100000

<div class="demoheading">CascadingDropDown Demonstration</div> <table> <tr> <td>Make</td> <td><asp:DropDownList ID="DropDownList1" runat="server" Width="170" /> </td> </tr> <tr> <td>Model</td> <td><asp:DropDownList ID="DropDownList2" runat="server" Width="170" /> </td> </tr> <tr>

We roll back to end this transaction: benchmark@ORA92I> rollback; Rollback complete. We execute our second procedure in a new transaction, printing out the undo generated afterward: benchmark@ORA92I> exec single_stmt_insert PL/SQL procedure successfully completed. benchmark@ORA92I> exec dbms_output.put_line( get_undo ); 253952 PL/SQL procedure successfully completed. benchmark@ORA92I> select count(*) from t1; 100000

code against Oracle9i (instead of 10g). This is because of a bug in Oracle 10g Release 1, due to which the undo information generated is more than actually is required, which in turn makes it difficult to demonstrate the concept on 10g. The bug is being worked on at the time of this writing.

CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)

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As you can see, the procedure row_by_row generates only 7,069,696 bytes of undo, which is around 28 times the 253,952 bytes of undo generated by the procedure single_stmt_insert. In general, if you use single SQL statement instead of doing row-by-row procedural processing, your code will generate less undo, run faster, and be more scalable.

All things being equal, you should choose an approach that generates the least amount of undo. Tip

<td>Color</td> <td><asp:DropDownList ID="DropDownList3" runat="server" Width="170" AutoPostBack="true" OnSelectedIndexChanged="DropDownList3 SelectedIndexChanged" /> </td> </tr> </table> <br /> <ajaxToolkit:CascadingDropDown ID="CascadingDropDown1" runat="server" TargetControlID="DropDownList1" Category="Make" PromptText="Please select a make" LoadingText="[Loading makes...]" ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents" /> <ajaxToolkit:CascadingDropDown ID="CascadingDropDown2" runat="server" TargetControlID="DropDownList2" Category="Model" PromptText="Please select a model" LoadingText="[Loading models...]" ServiceMethod="GetDropDownContentsPageMethod" ParentControlID="DropDownList1" /> <ajaxToolkit:CascadingDropDown ID="CascadingDropDown3" runat="server" TargetControlID="DropDownList3" Category="Color" PromptText="Please select a color" LoadingText="[Loading colors...]" ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents" ParentControlID="DropDownList2" /> ... </div>

In general, row-by-row processing (as is done by the previous row_by_row procedure) is almost Tip

always slower than a single SQL statement approach (as is done by single_stmt_insert).

Redo refers to information stored in redo log files by Oracle for use in recovering a database after a crash During the recovery of a database instance after a crash, Oracle replays the actions in redo log files to get back to the point in the system before the crash An important thing for developers to remember is that Oracle updates the redo log files very frequently to minimize data loss in the event of a recovery.

The three ASP.NET drop-down controls at the beginning of this code segment make up the three selection points, which are followed by the three CascadingDropDown controls. Each of these extender controls specifies the corresponding drop-down (by using the TargetControlID property) as well as the ServicePath ServiceMethod properties, which will be used as a data source. And that s it! Beyond that, there is a little more code on the web form itself that displays text to the users in the appropriate event handlers. The rest of the work is done in a web service as listed here:

The redo log file data is written at least Every three seconds When the memory structure maintaining redo information (called the redo log buffer) is one-third or 1MB full Whenever a transaction is committed Since the frequency with which redo log files are written to is necessarily high by design, the process that does this job can easily become a systemwide bottleneck if the following conditions are true: The redo log files have not been optimally sized or configured to minimize systemwide contention This is, strictly speaking, a DBA s job The code written by you as the developer is generating more redo than necessary The second point highlights the fact that the more redo your code generates, the more time it takes to complete your operation and, perhaps more importantly, the slower the entire system becomes, since redo log synchronization is a systemwide point of contention.

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