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

Writes modified data from the buffer cache to disk (data files) Writes redo log buffer contents to the online redo log files Updates the headers of all data files to record the checkpoint details Cleans up after finished and failed processes Performs crash recovery and coalesces extents Archives filled online redo log files Performs database-manageability-related tasks Performs tasks like capturing session history and metrics Coordinates the sizing of the SGA components Coordinates job queues to expedite job processes

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As mentioned before, it is a simplification to assume that references stored on the stack are always root references. It depends on the current point of execution whether a reference on the stack is considered a root reference or not. At first, it sounds straightforward that all references on the stack are roots, because each function can use the references in its stack frame. In fact, garbage collection would work correctly if all stack variables were considered to be root references until the method returns. However, the garbage collector is more optimized than that. Not all variables on the stack are used until the function returns. As an example, the following code shows a function that uses several local variables. In the comments, you can see when each of the references is used for the last time. using namespace System; int main() { Uri^ uri = gcnew Uri("http://www.heege.net/blog/default.aspx"); String^ scheme = uri->Scheme; String^ host = uri->Host; String^ localpath = uri->LocalPath; // variable "localpath" is not used afterwards int port = uri->Port; // variable "uri" is not used afterwards Console::WriteLine("Scheme: {0}", scheme); // variable "scheme" is not used afterwards Console::WriteLine("Host: {0}", host); // variable "host" is not used afterwards }

Oracle doesn t modify data directly on the disks all modifications of data take place in Oracle memory. The database writer (DBWn) process is then responsible for writing the dirty (modified) data from the memory areas known as database buffers to the actual data files on disk. It is the database writer process s job to monitor the use of the database buffer cache, and if the free space in the database buffers is getting low, the database writer process makes room available by writing some of the data in the buffers to the disk files. The database writer process uses the least recently used (LRU) algorithm (or a modified version of it), which retains data in the memory buffers based on how long it has been since someone asked for that data. If a piece of data has been requested very recently, it s more likely to be retained in the memory buffers. The database writer process writes dirty buffers to disk under the following conditions: 1. When the database issues a checkpoint 2. When a server process can t find a clean reusable buffer after checking a threshold number of buffers 3. Every 3 seconds

Now the script gathers information about the operating system and kernel, including their versions and release numbers. It also obtains the system uptime and outputs colorized text reporting the results.

Just because a user commits a transaction, it is not made permanent by the database writer process with an immediate write to the database files. Oracle conserves physical I/O by waiting to perform a more efficient write of batches of committed transactions at once.