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

Are these savings significant enough to warrant letting go of the established, battle-proven UNIX servers from Sun Microsystems and HP This is a question that each individual organization has to answer, based on their needs and their expectations regarding performance For example, a research institution would be more justified in plunging headlong into the Linux world than a commercial financial service providing online services to a large number of customers Despite all the hype, remember that Linux is still busy gradually incorporating features that have been well established in UNIX servers for years These features include improving I/O throughput and memory utilization, as well as Symmetric Multi-Processor (SMP) scalability..

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Several UNIX operating systems have their own system-monitoring tools. For example, on the HP-UX operating system, GlancePlus is a package that is commonly used by system administrators and DBAs to monitor memory, disk I/O, and CPU performance. Figure 3-3 shows a typical GlancePlus session in text mode, invoked with the following command: $ glance -m The CPU, memory, disk, and swap usage is summarized in the top section. The middle of the display gives you a detailed memory report, and at the bottom of the screen you can see a short summary of memory usage again.

Note that this session shows memory usage in detail because GlancePlus was invoked with the -m option (glance -c would give you a report on CPU usage, and glance -d would give you a disk usage report).

Displaying a Range of Fields (Alternate Method)

GlancePlus also has an attractive and highly useful GUI interface, which you can invoke by using the command gpm.

Besides monitoring the CPU and memory on the system, you need to monitor the network to make sure there are no serious traffic bottlenecks. The netstat utility comes in handy for this purpose, and it works the same way on UNIX as it does on the Windows servers.

The topic of physical storage and using the disk system in UNIX is extremely important for the DBA the choice of disk configuration has a profound impact on the availability and the performance of the database. Some Oracle databases benefit by using raw disk storage instead of disks controlled by the UNIX operating system. The Oracle Real Application Clusters (RACs) can only use the raw devices; they can t use the regular UNIX-formatted disks. All the UNIX files on a system make up its file system, and this file system is created on a disk partition, which is a slice of a disk, the basic storage device.

Console::WriteLine("{0}, {1}, {2}", base->iInternal, base->iPublicProtected, base->iPublic); } void TestVisibility(Derived^ derived) { // all except private members can be accessed via Derived1^ Console::WriteLine("{0}, {1}, {2}, {3}, {4}", derived->iInternal, derived->iProtectedPrivate, derived->iProtected, derived->iPublicProtected, derived->iPublic); } }; public ref class Unrelated { void TestVisibility(Base^ base) { // only internal, public protected and public members can be accesed via Base^ Console::WriteLine("{0}, {1}, {2}", base->iInternal, base->iPublicProtected, base->iPublic); } }; The member visibility outside of an assembly is shown in the next block of sample code, which depends on the previous one: // TestExternalVisibility.cpp // CL /LD /clr:safe TextExternalVisibility.cpp #using "TestVisibility.dll" using namespace System; public ref class ExternalDerived : Base { public: void TestVisibility(Base^ base) { // only public members an be assecced via Base^ Console::WriteLine("{0}", base->iPublic); } void TestVisibility(ExternalDerived^ derived) { // all except private, protected private and internal members // can be accessed via ExternalDerived^ Console::WriteLine("{0}, {1}, {2}", derived->iProtected, derived->iPublicProtected, derived->iPublic); }