ASP.NET Web PDF Document Viewer/Editor Control Library
Look up the tradeoff between a certain MTTR and total I/O in the Instance Recovery section. Turn archive logging on and off and enable and disable the automatic archiving of the redo logs, both through the Media Recovery section. Manage the flash recovery area (discussed in detail in 15), including its location and size, and enable and disable Flashback Database logging for fast database point-in-time recovery. You do all this from the Flash Recovery Area section.
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The online redo logs are Oracle s means of ensuring that all the changes made by the users are logged, in case there s a failure before those changes can be written to permanent storage. Thus, redo logs are fundamental for the recovery process. Oracle organizes its redo log files in redo log groups, and you need to have at least two different groups of redo logs with at least one member in each. You need to have at least two redo groups, because even when one redo log is being archived, the log writer should be able to write to an active redo log. Although your database will run just fine with only one member in each redo log group, Oracle strongly recommends that you multiplex the online redo logs. Multiplexing simply means that you maintain more than one member in each of your redo log groups. All members of a redo log group are identical multiplexing is designed to protect against the loss of a single copy of a log file. When you multiplex the online redo log files, the log writer writes simultaneously to all the members of a group.
Always multiplex the online redo log, as you can lose data if one of the active online redo logs is lost due to Tip a disk problem. The multiplexed redo logs should ideally be located on different disk drives under different disk controllers.
Mirroring will protect you from a disk failure, but it will not protect you against an accidental deletion of files. Multiplexing ensures that your files are protected soundly against such errors. If you lose an online redo log file before the redo information is written to the disk, you may lose valuable data, so under a multiplexed redo log system, the LGWR background process, which is in charge of writing redo log data from the redo log buffer, writes simultaneously to all the (identical) members of a multiplexed group. If there are problems writing to one member of a multiplexed group of redo logs, the writes to the other members continue unhindered.
It is also possible to load assemblies via explicit APIs. This is especially helpful for applications that support plug-ins. There is a variety of static functions in System::Reflection::Assembly that can be used to load an assembly dynamically. The two most important ones are as follows: Assembly^ Assembly::Load(String^ assemblyName); Assembly^ Assembly::LoadFrom(String^ url); Assembly::Load expects a string with the four-part assembly name as an argument. To determine the code base to the assembly, the assembly resolution algorithm is used in the same way as it is used for assemblies loaded during JIT compilation. Assembly::LoadFrom expects a string specifying a file name or a path to the assembly. This API is often used for unit tests. LoadFrom does not simply load the assembly from the specified location. Instead, it first opens the assembly file to determine the assembly s four-part assembly name. This assembly name is then passed to the assembly resolution algorithm. If an assembly is found via assembly resolution, the assembly will be loaded from the resolved location. Otherwise, the assembly will be loaded from the specified path. Even though this behavior sounds strange, it can prevent two assembly files with the same identity from being loaded. These problems existed in earlier versions of the CLR, in which LoadFrom simply loaded the assembly from the specified location.