ASP.NET Web PDF Document Viewer/Editor Control Library

do printfn "Getting response stream for %s..." nm let stream = resp.GetResponseStream() do printfn "Reading response for %s..." nm let reader = new StreamReader(stream) let! html = reader.ReadToEndAsync() do printfn "Read %d characters for %s..." html.Length nm } for nm,url in museums do Async.Spawn (fetchAsync(nm,url)) The types of these functions and values are as follows: val museums : (string * string) list val fetchAsync : string * string -> Async<unit> When run on one of our machines via F# Interactive, the output of the code from Listing 13-5 is as follows: Creating request Creating request Creating request Getting response Reading response for for for for for MOMA... British Museum... Prado... MOMA... MOMA...

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Earlier, I wrote that "in theory" we can use the PGA_AGGREGATE_TARGET to control the overall amount of PGA memory used by the instance We saw in the last example that this is not a hard limit, however The instance will attempt to stay within the bounds of the PGA_AGGREGATE_TARGET, but if it can t, it won t stop processing; rather, it will just be forced to exceed that threshold Another reason this limit is "theory" is because work areas, though large contributors to PGA memory, are not the only contributors to PGA memory Many factors contribute to PGA memory allocation and only the work areas are under the control of the database instance.

If you create and execute a PL/SQL block of code that fills in a large array with data in dedicated server mode where the UGA is in the PGA, Oracle can t do anything but allow you to do it Consider the following quick example We'll create a package that can hold some persistent (global) data in the server: ops$tkyte%ORA11GR2> create or replace package demo_pkg 2 as 3 type array is table of char(2000) index by binary_integer; 4 g_data array; 5 end; 6 / Package created Now we'll measure the amount of memory our session is currently using in the PGA/UGA (I used a dedicated server in this example, so the UGA is a subset of the PGA memory): ops$tkyte%ORA11GR2> select aname, to_char(bvalue, '999,999,999') bytes, 2 to_char(round(bvalue/1024/1024,1), '99,9999' ) mbytes 3 from v$statname a, v$mystat b 4 where astatistic# = bstatistic# 5 and a.

Getting response for Prado... Reading response for Prado... Read 188 characters for Prado... Read 41635 characters for MOMA... Getting response for British Museum... Reading response for British Museum... Read 24341 characters for British Museum... The heart of the code in Listing 13-5 is the construct introduced by async { ... }. This is an application of the workflow syntax introduced in 9. Now let s take a closer look at Listing 13-5. The key operations are the two let! operations within the workflow expression: async { do ... let! resp = req.GetResponseAsync() do ... ... let! html = reader.ReadToEndAsync() do ... } Within asynchronous workflow expressions, the language construct let! var = expr in body simply means perform the asynchronous operation expr and bind the result to var when the operation completes. Then continue by executing the rest of the computation body. With this in mind, you can now see what fetchAsync does: It synchronously requests a web page. It asynchronously awaits a response to the request. It gets the response Stream and StreamReader synchronously after the asynchronous request completes. It reads to the end of the stream asynchronously. After the read completes, it prints the total number of characters read synchronously. Finally, the method Async.Spawn is used to initiate the execution of a number of asynchronous computations. This works by queuing the computations in the .NET thread pool. The .NET thread pool is explained in more detail in the following section.

name like '%ga memory%'; NAME BYTES MBYTES ------------------------------ ------------ --------session uga memory 1,367,116 13 session uga memory max 1,367,116 13 session pga memory 1,868,392 18 session pga memory max 1,868,392 18 Initially we are using about 18MB of PGA memory in our session (as a result of compiling a PL/SQL package, running this query, etc) Now, we'll run our query against T again using the same 256MB PGA_AGGREGATE_TARGET (this was done in an otherwise idle instance; we are the only session requiring memory right now): ops$tkyte%ORA11GR2> set autotrace traceonly statistics; ops$tkyte%ORA11GR2> select * from t order by 1,2,3,4; 71917 rows selected Statistics ---------------------------------------------------------0 recursive calls 0 db block gets.

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