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

Often it is wise to hide the internals of an asynchronous computation behind an object, since the use of message passing can be seen as an implementation detail. Furthermore, Listing 13-10 hasn t shown you how to retrieve information from the counter, except by printing it to the standard output. Furthermore, it hasn t shown how to ask the processing agent to exit. Listing 13-11 shows how to implement an object wrapping an agent that supports Increment, Stop, and Fetch messages. Listing 13-11. Hiding a Mailbox and Supporting a Fetch Method open Microsoft.FSharp.Control.Mailboxes /// The internal type of messages for the agent type internal msg = Increment of int | Fetch of IChannel<int> | Stop

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Starting in Oracle9i, you can have multiple database blocksizes in the same database. Previously, all blocks in a single database were the same size and in order to have a different blocksize, you had to rebuild the entire database. Now you can have a mixture of the "default" blocksize (the blocksize you used when you initially created the database; the size that is used for the SYSTEM and all TEMPORARY tablespaces) and up to four other blocksizes. Each unique blocksize must have its own buffer cache area. The default, keep, and recycle pools will only cache blocks of the default size. In order to have a nondefault blocksize in your database, you need to have configured a buffer pool to hold them. In this example, my default blocksize is 8KB. I will attempt to create a tablespace with a 16KB blocksize: ops$tkyte%ORA11GR2> create tablespace ts_16k 2 datafile '/tmp/ts_16k.dbf' 3 size 5m 4 blocksize 16k;

type CountingAgent() = let counter = MailboxProcessor.Start(fun inbox -> // The states of the message-processing state machine... let rec loop(n) = async { let! msg = inbox.Receive() match msg with | Increment m -> // increment and continue... return! loop(n+m) | Stop -> // exit return () | Fetch replyChannel -> // post response to reply channel and continue do replyChannel.Post(n) return! loop(n) } // The initial state of the message-processing state machine... loop(0)) member a.Increment(n) = counter.Post(Increment(n)) member a.Stop() = counter.Post(Stop) member a.Fetch() = counter.PostSync(fun replyChannel -> Fetch(replyChannel)) The inferred public types indicate how the presence of a concurrent agent is successfully hidden by the use of an object: type CountingAgent = new : unit -> CountingAgent member Fetch : unit -> int member Increment : n:int -> unit member Stop : unit -> unit Here you can see an instance of this object in action: > let counter = new CountingAgent();; val counter : CountingAgent > counter.Increment(1);; val it : unit = () > counter.Fetch();; val it : int = 1

create tablespace ts_16k * ERROR at line 1: ORA-29339: tablespace block size 16384 does not match configured block sizes ops$tkyte%ORA11GR2> show parameter 16k NAME TYPE VALUE ------------------------------------ ----------- -----------------------------db_16k_cache_size big integer 0 Right now, since I have not configured a 16KB cache, I can t create such a tablespace. I could do one of a couple of things right now to rectify this situation. I could set the db_16k_cache_size parameter and restart the database. I could shrink one of my other SGA components in order to make room for a 16KB cache in the existing SGA. Or, I might be able to just allocate a 16KB cache if the SGA_MAX_SIZE parameter was larger than my current SGA size.

The NameValueListBase class is designed specifically to support the idea of lookup tables or lists of read-only key/value data such as categories, customer types, product types, and so forth. The goal of this class is to simplify the process of retrieving such data and displaying it in common controls like drop-down lists, combo boxes, and other list controls.

Note Starting in Oracle9i, you can resize various SGA components while the database is up and running. If you

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want to be able to "grow" the size of the SGA beyond its initial allocation, you must have set the SGA_MAX_SIZE parameter to some value larger than the allocated SGA. For example, if after startup your SGA size was 128MB and you wanted to add an additional 64MB to the buffer cache, you would have had to set the SGA_MAX_SIZE to 192MB or larger to allow for the growth.

In this example, I will set the db_16k_cache_size and restart, since I m using automatic SGA memory management and don t wish to set any of the other caches manually: ops$tkyte%ORA11GR2> alter system set sga_target = 256m scope=spfile; System altered. ops$tkyte%ORA11GR2> alter system set db_16k_cache_size = 16m scope=spfile; System altered. ops$tkyte%ORA11GR2> connect / as sysdba Connected. sys%ORA11GR2> startup force ORACLE instance started. Total System Global Area Fixed Size Variable Size Database Buffers Redo Buffers Database mounted. Database opened. 267825152 1335924 134221196 130023424 2244608 bytes bytes bytes bytes bytes

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