ASP.NET PDF Viewer using C#, VB/NET

Queries on XML are often expressed using the XPath query language, which we don t cover in detail in this book but which is supported by the types in the System.Xml namespace. As a good alternative to XPath, you can use the standard sequence operators to perform queries over XML data. The following example uses the helper functions and the file contacts2.xml created in the previous section: open System open System.Xml.Linq let elem (e: XElement) s let elemv e s = e.Element(xname s) = (elem e s).Value

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Note The owner of the previous function will need to have been granted direct select access to the V$ views

And we ll measure the CPU and Elapsed time used to commit our transaction using the DBMS_UTILITY package routines GET_CPU_TIME and GET_TIME. The actual PL/SQL block used to generate the workload and report on it is: ops$tkyte%ORA11GR2> declare 2 l_redo number; 3 l_cpu number; 4 l_ela number; 5 begin 6 dbms_output.put_line 7 ( '-' || ' Rows' || ' Redo' || 8 ' CPU' || ' Elapsed' ); 9 for i in 1 .. 6 10 loop 11 l_redo := get_stat_val( 'redo size' ); 12 insert into t select * from big_table where rownum <= power(10,i); 13 l_cpu := dbms_utility.get_cpu_time; 14 l_ela := dbms_utility.get_time; 15 commit work write wait; 16 dbms_output.put_line 17 ( '-' || 18 to_char( power( 10, i ), '9,999,999') || 19 to_char( (get_stat_val('redo size')-l_redo), '999,999,999' ) || 20 to_char( (dbms_utility.get_cpu_time-l_cpu), '999,999' ) || 21 to_char( (dbms_utility.get_time-l_ela), '999,999' ) ); 22 end loop; 23 end; 24 / Rows Redo 10 2,876 100 10,040 1,000 113,304 10,000 1,138,172 100,000 12,206,160 - 1,000,000 122,607,172 CPU Elapsed 1 1 0 1 0 1 1 2 1 3 1 2

let contactsXml = XElement.Load(file "contacts2.xml") let contacts = contactsXml.Elements () > contacts |> Seq.filter (fun e -> (elemv e "name").StartsWith "J") |> Seq.map (fun e -> (elemv e "name"), (elemv e "phone"));; val it : seq<string * string> = seq [("John Smith", "+1 626-123-4321")] In this example, we also defined some helper functions: elem to extract from an XElement object the first child element with a given name and elemv to convert that to a string value. You can also use the query operators in building new XML: xelem "results" [ contacts |> Seq.filter

PL/SQL procedure successfully completed. * This test was performed on a single-user machine with a 1.7MB log buffer and three 50MB online redo log files. Times are in hundredths of seconds.

Note Directions on how to generate the BIG_TABLE used in many examples is in the Setting Up Your

(fun e -> (elemv e "name").StartsWith "J")

As you can see, as we generate varying amount of redo from 2,876 bytes to 122MB, the difference in time to COMMIT is not measurable using a timer with a one hundredth of a second resolution. As we were processing and generating the redo log, LGWR was constantly flushing our buffered redo information to disk in the background. So, when we generated 122MB of redo log information, LGWR was busy flushing

every 1MB or so. When it came to the COMMIT, there wasn t much left to do not much more than when we created ten rows of data. You should expect to see similar (but not exactly the same) results, regardless of the amount of redo generated.

This creates a <results> tag and inserts all employees whose last name starts with the letter J. You can also use sequence expressions to achieve the same: xelem "results" [ for e in contacts do if (elemv e "name").StartsWith "J" then yield e ]