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

The following formula gives you the buffer cache hit ratio: 1 - ('physical reads cache') / ('consistent gets from cache' + 'db block gets from cache') You can use the following query to get the current values for all three necessary buffer cache statistics: SQL> SELECT name, value FROM v$sysstat WHERE where name IN ('physical reads cache', 'consistent gets from cache', 'db block gets from cache'); --------------------------------db block gets from cache -----------103264732.

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When delegates are used for event handling, it is the client s job to instantiate a delegate and pass it to the component The component can store a handle to the delegate object in a member variable and use it for the callback when the event needs to be fired So far, we have not discussed how a client can pass a delegate The CTS introduces a new kind of type member especially for the passing of event handler delegates This type member is called event The following code defines a PageDumped event in the FileDumper component: public ref class FileDumper : public Component { int pagesDumped; void DumpPage(StreamReader^ sr, String^% line) { /* .. same as before ...

The following command searches for occurrences of somedomain in the lines of the file and, on each line where this string is found, replaces all entries of somedomain with newdomain. ed Command

Once you configure a certain RAID level on your disk, you can t easily switch to a different configuration. You have to completely reload all your applications and the databases if you decide to change configurations.

In general, the following guidelines will serve you well when you are considering the RAID configuration for your disks: RAID 5 offers many advantages over the other levels of RAID. The traditional complaint about the write penalty should be discounted because of sophisticated advances in write caches and other strategies that make RAID 5 much more efficient than in the past. The RAID 5 implementations using specialized controllers are far more efficient than softwarebased RAID or RAID 5 implementations based on the server itself. Using write caches in RAID 5 systems improves the overall write performance significantly. Allow for a lot more raw disk space than you figure you ll need. This includes your expansion estimates for storage space. Fault tolerance requires more disks under RAID systems than other systems. If you need 400GB of disk space, and you are using a RAID 5 configuration, you will need seven disks, each with 72GB storage capacity. One of the seven drives is needed for writing parity information. If you want to have a hot spare on the system, you would need a total of eight disks. Stripe widths depend on your database applications. If you are using OLTP applications, you need smaller stripe sizes, such as 128KB per stripe. Data warehouses benefit from much larger stripe sizes. Know your application. Having a good idea about what you are trying to achieve with the databases you are managing will help you decide among competing RAID alternatives. Always have at least one or two hot spares ready on the storage systems.

If you have a RAID 5 configuration, you are still vulnerable to a malfunction of the disk controllers. To avoid this, you can configure your systems in a couple of different ways. First, you can mirror the disks on different controllers. Alternatively, you can use redundant pairs of disk controllers, where the second controller takes over automatically by using an alternative path if the first controller fails for some reason.

You can implement RAID in a number of ways. You could make a fundamental distinction between software-based and hardware-based RAID arrays. Software RAID implementation uses the host server s CPU and memory to send RAID instructions and I/O commands to the arrays. Software RAID implementations impose an extra burden on the host CPU, and when disks fail, the disks with the operating system may not be able to boot if you are using a software-based RAID system. Hardware RAID uses a special RAID controller, which is usually external to the server host-based controllers can also be used to provide RAID functionality to a group of disks, but they are not as efficient as external RAID controllers.

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