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2. The nested loop operation receives every row from the index seek, and asks for those same rows from the clustered index, calling the key lookup operation. Just ignore the compute scalar operation, as it s only handling a type conversion. 3. The nested loop assembles, or joins, the data from the index seek and key lookup and passes the data to the select operation, which returns the correct columns to the client. Note the following key pieces of information on the query plan: The type of operation. Key operations are listed later in Table 63-1. The object, listed below the operator and in the pop-up info box, is the actual index hit by the operation. The estimated number of rows, as the Query Optimizer uses the estimated number of rows to choose the best query execution plan. The estimated operator cost and the estimated subtree cost are relative values used by the Query Optimizer. When tuning a query, these are critical values to watch. I typically read the cost as cost times 1,000. For example, I ll read .0051234 as 5, or .3255786 as 325, to make it easier to think through the plans. Plans can also be saved to a plan le (.sqlplan) to be reexamined later. Re-opening a plan opens the graphical execution plan. The context menu has a new option to edit the SQL query, which opens the original SQL statement in a new Query Editor tab.

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(10 MHZ)

The notation @10 means to print the ten values that begin at ary. Say, on the other hand, that you want to print the five values stored in ary beginning with the first element. The command for this would be the following:

it can transmit up to 25 gigabits per second On the downside, ATM is more expensive than ISDN and DSL Switched hub technologies Switched hub technologies are often used to boost local area networks A switched hub can turn many small LANs into one big LAN A network need not be rewired nor adapter cards replaced when changes are made; all that is needed is the addition of a switching hub Switched hub technology can also add an ATM-like packet-switching capability to existing LANs, essentially doubling bandwidth SONET Synchronous optical network (SONET) is an interface standard for transporting digital signals over ber-optic links that allows the integration of transmissions from multiple vendors SONET de nes optical line rates, known as optical carrier (OC) signals The base rate is 5184 Mbps (OC-1), and higher rates are direct multiples of the base rate For example, OC-3 runs at 155.

Given that more than one type of bean exists, how do you decide which type is appropriate for a particular problem As we have shown, the main difference between session and entity beans is that the former represent business processes (workflow) whereas the latter represent business data. Obviously, a session bean may be used to interact with an entity bean. For example, consider the airline-reservation system shown in Figure 14-3. The system employs a session bean to enquire of the specific airline about the availability of seats on the plane requested by the tourist; the data returned by the session bean can then be displayed graphically at the client frontend. This particular interaction is a one-shot and the same client is not required to have subsequent interactions with the airline system to share information.

52 Mbps, or three times the rate of OC-1 T-carrier system The T-carrier system is a digital transmission system that de nes circuits that operate at different rates, all of which are multiples of the basic 64 Kbps used to transport a single voice call These circuits include T1 (1544 Mbps, equivalent to 24 channels); T2 (6312 Mbps, equivalent to 96 channels); T3 (44736 Mbps, equivalent to 672 channels); and T4 (274176 Mbps, equivalent to 4,032 channels) The T-carrier system uses a technique called multiplexing which enables multiple signals to share the telephone line The T1 line is the most popular; the T3 line, which is used for the Internet backbone, is 28 times faster than T1 ISDN.