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From within applications: The subscribing applications refresh the components that are subscribing to a master component. If you wanted only certain applications to have their subscribing components updated, you would refresh the components from within those applications. The following components can take part in the publish/subscribe feature: Authentication schemes Authorization schemes Lists of values Navigation bar entries Shortcuts Templates When you create any of these component types, you have the option of subscribing to an already existing component of the same type. For example, suppose you create a master application that has a named List of Values (LOV) component that uses the following query: select ename d, empno r from emp order by 1 Figure 1-14 shows the results of using this LOV in a select list.

One of the important tasks of a server is to save frequently used data in RAM. This process is called caching. The advantage of caching is that data can be used directly from your server s RAM and doesn t have to be copied from your server s hard drive first. Since RAM on a server is much faster than the speed of a hard drive, the speed of a server can be increased enormously if an efficient caching algorithm is used. The MONITOR parameters Original Cache Buffers and Total Cache Buffers give an indication of the availability of cache buffers on your server. First, there is the parameter Original Cache Buffers, which indicates how much cache was available just after the server was started and the NetWare kernel was loaded. With the parameter Total Cache Buffers, you can see how much memory is still available for caching at this moment. The available memory can be used for several different things: it can be used to cache files, but it can also be used to provide memory that is needed to load new NLMs on your server. To determine whether or not your server has enough available memory, use these two general rules: If less than 20 percent of the total memory is available for caching, more memory needs to be added. On an average server, about 50 percent of the server s RAM must be available for caching. The exact amount of memory available for caching, however, depends on server usage.

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Two parameters closely related to each other are the settings for packet receive buffers and service processes A packet receive buffer is a buffer in your server s RAM that is reserved for incoming packets These buffers are very important: they are the waiting room for those packets entering via your server You must always have enough of these buffers, but you should also take care never to have too much of them, because a server that has too many unused packet receive buffers is wasting precious resources At the moment a packet comes in on the network card of a server, there must be a packet receive buffer available If there isn t, the incoming packet is dropped and must be sent again If this happens too much, it can lead to congestion on the network.

In another application within the same workspace, you can create a new LOV and choose to create it based on an existing LOV, as shown in Figure 1-15. The LOV creation wizard will then allow you to select which application (in the same workspace) should be used to list the available LOVs to subscribe to, as shown in Figure 1-16.

public Product() { } public Product(int productID, int categoryID, string productName, decimal price, int quantity) { this.productID = productID; this.categoryID = categoryID; this.productName = productName; this.price = price; this.quantity = quantity; } public int ProductID { get { return this.productID; } set { this.productID = value; } } public int CategoryID { get { return this.categoryID; } set { this.categoryID = value; } }

If, on the other hand, you have too many allocated packet receive buffers, these unused buffers can t be used for the caching of files, and that s bad as well Closely related to the packet receive buffers are the service processes These handle all incoming packets from the packet receive buffers It may be clear that if you haven t enough service processes, packets are waiting too long in the packet receive buffers It may, however, appear that there is no possibility to allocate new service processes, because your server is overloaded Every service process needs time on the server s CPU to do its work, and if this CPU s utilization is up to 100 percent, there s no more room for new service processes In short, it s a chain you have to monitor.

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