.NET/ASP.NET/C#/VB.NET PDF Document SDK

tmp" i) .. } This line opened the input stream synchronously using FileOpenRead Although this is a synchronous operation, the use of use indicates that the lifetime of the stream is managed over the remainder of the workflow The stream will be closed when the variable is no longer in scope,.

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At any time in Oracle 10g and above, you may query V$SGAINFO to see which components of the SGA are resizable: ops$tkyte%ORA11GR2> select * from V$SGAINFO; NAME BYTES RES ---------------------------------------- ---------- --Fixed SGA Size 1335924 No Redo Buffers 2244608 No Buffer Cache Size 113246208 Yes Shared Pool Size 142606336 Yes Large Pool Size 4194304 Yes Java Pool Size 4194304 Yes Streams Pool Size 0 Yes Shared IO Pool Size 0 Yes Granule Size 4194304 No Maximum SGA Size 267825152 No Startup overhead in Shared Pool 109051904 No Free SGA Memory Available 0 12 rows selected.

Note To use automatic SGA memory management, the parameter statistics_level must be set to TYPICAL

that is, at the end of the workflow, even if asynchronous activations occur in between If any step in the workflow raises an uncaught exception, then the stream will also be closed while handling the exception The next line reads the input stream asynchronously using inStreamReadAsync: async { use inStream = FileOpenRead(sprintf "Image%dtmp" i) let! pixels = inStreamReadAsync(numPixels) .. } StreamReadAsync is an extension method added to the NET SystemIOStream class by opening the F# namespace MicrosoftFSharpControlCommonExtensions, and it generates a value of type Async<byte[]> The use of let! executes this operation asynchronously and registers a callback When the callback is invoked, the value pixels is bound to the result of the operation, and the remainder of the asynchronous workflow is executed The next line transforms the image synchronously using TransformImage: async { use inStream = FileOpenRead(sprintf "Image%d.

or ALL. If statistics collection is not enabled, the database will not have the historical information needed to make the necessary sizing decisions.

Under automatic SGA memory management, the primary parameter for sizing the auto-tuned components is SGA_TARGET, which may be dynamically sized while the database is up and running, up to the setting of the SGA_MAX_SIZE parameter. This defaults to be equal to the SGA_TARGET, so if you plan on increasing the SGA_TARGET, you must have set the SGA_MAX_SIZE larger before starting the database instance. The database will use the SGA_TARGET value, minus the size of any of the other manually sized components such as the db_keep_cache_size, db_recycle_cache_size, and so on, and use that amount of memory to size the default buffer pool, shared pool, large pool, and Java pool. Dynamically at runtime, the instance will allocate and reallocate memory among those four memory areas as needed. Instead of returning an ORA-04031 "Unable to allocate N bytes of shared memory" error to a user when the shared pool runs out of memory, the instance could instead choose to shrink the buffer cache by some number of megabytes (a granule size) and increase the shared pool by that amount. Over time, as the memory needs of the instance are ascertained, the size of the various SGA components would become more or less fixed in size. The database also remembers the sizes of these four components across database startup and shutdown so that it doesn't have to start all over again figuring out the right size for your instance each time. It does this via four double-underscore parameters: __db_cache_size, __java_pool_size, __large_pool_size, and __shared_pool_size. During a normal or immediate shutdown, the database will record these values to the stored parameter file and use them at startup to set the default sizes of each area.

tmp" i) let! pixels = inStreamReadAsync(numPixels) let pixels' = TransformImage(pixels,i) .. } Like the first line, the next line opens the output stream Using use guarantees that the stream is closed by the end of the workflow regardless of whether exceptions are thrown in the remainder of the workflow async { use inStream = FileOpenRead(sprintf "Image%dtmp" i) let! pixels = inStreamReadAsync(numPixels) let pixels' = TransformImage(pixels,i) use outStream = FileOpenWrite(sprintf "Image%ddone" i) .. } The final line of the workflow performs an asynchronous write of the image Once again, WriteAsync is an extension method added to the NET SystemIOStream class by opening the F# namespace MicrosoftFSharpControlCommonExtensions async { use inStream = FileOpenRead(sprintf "Image%dtmp" i) let! pixels = inStreamReadAsync(numPixels) let pixels' = TransformImage(pixels,i) use outStream = FileOpenWrite(sprintf "Image%ddone" i) do! outStream.

Note This last feature, of storing the recommended values for the pools, only works if you are using stored