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that both relations are sorted on the attributes R S Then, their join can be computed by a process much like the merge stage in the merge sort algorithm Figure 136 shows the merge join algorithm In the algorithm, JoinAttrs refers to the attributes in R S, and tr 1 ts , where tr and ts are tuples that have the same values for JoinAttrs, denotes the concatenation of the attributes of the tuples, followed by projecting out repeated attributes The merge join algorithm associates one pointer with each relation These pointers point initially to the rst tuple of the respective relations As the algorithm proceeds, the pointers move through the relation A group of tuples of one relation with the same value on the join attributes is read into Ss

ciscoasa# show resource usage context admin Resource Current Peak Limit Denied Telnet 1 1 5 0 Conns 44 55 N/A 0 Hosts 45 56 N/A 0 Context admin admin admin

The McGraw Hill Companies, 2001

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Once you have created your contexts, you can switch to them from the CLI or access them using ASDM to set up their configuration and security policies The following sections will discuss how to switch between contexts from the CLI, how to save the configuration file of a context, and how to delete a context

The algorithm in Figure 136 requires that every set of tuples Ss t in main memory; we shall look at extensions of the algorithm to avoid this requirement later in this section Then, the corresponding tuples (if any) of the other relation are read in, and are processed as they are read Figure 137 shows two relations that are sorted on their join attribute a1 It is instructive to go through the steps of the merge join algorithm on the relations shown in the gure Since the relations are in sorted order, tuples with the same value on the join attributes are in consecutive order Thereby, each tuple in the sorted order needs to be read only once, and, as a result, each block is also read only once Since it makes only a single pass through both les, the merge join method is ef cient; the number of block accesses is equal to the sum of the number of blocks in both les, br + bs If either of the input relations r and s is not sorted on the join attributes, they can be sorted rst, and then the merge join algorithm can be used The merge join algorithm can also be easily extended from natural joins to the more general case of equi-joins Suppose the merge join scheme is applied to our example of depositor 1 customer The join attribute here is customer-name Suppose that the relations are already sorted on the join attribute customer-name In this case, the merge join takes a total of 400 + 100 = 500 block accesses Suppose the relations are not sorted, and the memory size is the worst case of three blocks Sorting customer takes 400 (2 log2 (400/3) + 1), or 6800, block transfers, with 400 more transfers to write out the result Similarly, sorting depositor takes 100 (2 log2 (100/3) + 1), or 1300, transfers, with 100 more transfers to write it out Thus, the total cost is 9100 block transfers if the relations are not sorted, and the memory size is just 3 blocks With a memory size of 25 blocks, sorting the relation customer takes a total of just 400 (2 log24 (400/25) + 1) = 1200 block transfers, while sorting depositor takes 300 block transfers Adding the cost of writing out the sorted results and reading them back gives a total cost of 2500 block transfers if the relations are not sorted and the memory size is 25 blocks As mentioned earlier, the merge join algorithm of Figure 136 requires that the set Ss of all tuples with the same value for the join attributes must t in main memory.

From the CLI, to move between the system area and a context, use the changeto command:

An individual commission rate (ICR) provides each person with his or her own commission rateThe purpose of ICRs is to manage payouts to a similar target incentive amount even though territories are dissimilar in size Sales management creates an ICR for each salesperson by dividing that person s target incentive amount (which may be unique for him or her) by the unique quota sales volume expected for the territory Figure 5-31 illustrates how to calculate ICR

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