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the nal row Next, we use the linear scale on balance to nd out similarly to which column the search key maps In this case, the balance 500000 maps to column 6 Thus, the search-key value ( Brighton , 500000) maps to the cell in row 0, column 6 Similarly, ( Downtown , 60000) would map to the cell in row 1 column 5 Both cells point to the same bucket (as indicated by the dotted box), so, in both cases, the system stores the search-key values and the pointer to the record in the bucket labeled Bj in the gure To perform a lookup to answer our example query, with the search condition of branch-name < Perryridge and balance = 1000 we nd all rows that can contain branch names less than Perryridge , using the linear scale on branch-name In this case, these rows are 0, 1, and 2 Rows 3 and beyond contain branch names greater than or equal to Perryridge Similarly, we nd that only column 1 can contain a balance value of 1000 In this case, only column 1 satis es this condition Thus, only the cells in column 1, rows 0, 1, and 2, can contain entries that satisfy the search condition We therefore look up all entries in the buckets pointed to from these three cells In this case, there are only two buckets, since two of the cells point to the same bucket, as indicated by the dotted boxes in the gure The buckets may contain some search keys that do not satisfy the required condition, so each search key in the buckets must be tested again to see whether it satis es the search condition We have to examine only a small number of buckets, however, to answer this query We must choose the linear scales in such a way that the records are uniformly distributed across the cells When a bucket call it A becomes full and an entry has to be inserted in it, the system allocates an extra bucket, B If more than one cell points to A, the system changes the cell pointers so that some point to A and others to B The entries in bucket A and the new entry are then redistributed between A and B according to the cells to which they map If only one cell points to bucket A, B becomes an over ow bucket for A To improve performance in such a situation, we must reorganize the grid le, with an expanded grid array and expanded linear scales The process is much like the expansion of the bucket address table in extensible hashing, and is left for you to do as an exercise It is conceptually simple to extend the grid- le approach to any number of search keys If we want our structure to be used for queries on n keys, we construct an ndimensional grid array with n linear scales The grid structure is suitable also for queries involving one search key Consider this query: select * from account where branch-name = Perryridge The linear scale on branch-name tells us that only cells in row 3 can satisfy this condition Since there is no condition on balance, we examine all buckets pointed to by cells in row 3 to nd entries pertaining to Perryridge Thus, we can use a grid- le index on.

By default the ARP inspection feature is disabled, which means that when the appliance sees an ARP query, it is flooded out the opposite interface Enabling ARP inspection is done with the arp-inspection command:

Figure 5-27 is an example of a variable commission rate featuring a hurdleWhile the payout schedule is not capped, the upside commission rates are not available unless the hurdle is met

SQL-based database systems use triggers widely, although before SQL:1999 they were not part of the SQL standard Unfortunately, each database system implemented its

ciscoasa(config)# arp-inspection logical_if_name enable [flood | no-flood]

The McGraw Hill Companies, 2001

ARP inspection is enabled on an interface-by-interface basis The flood parameter, which is the default if omitted, will flood all ARPs received on the interface The noflood parameter will not forward an ARP reply if it doesn t match a specific static ARP entry on the appliance Therefore, when using the no-flood parameter, you ll need to create static entries for the associated interface with the arp command:

create trigger overdraft-trigger after update on account referencing new row as nrow for each row when nrowbalance < 0 begin atomic insert into borrower (select customer-name, account-number from depositor where nrowaccount-number = depositoraccount-number); insert into loan values (nrowaccount-number, nrowbranch-name, nrowbalance); update account set balance = 0 where accountaccount-number = nrowaccount-number end Figure 63 Example of SQL:1999 syntax for triggers

If you don t configure this command and ARP flooding is disabled, devices will be unable to communicate with each other via IP across the associated interface

database systems) This trigger de nition speci es that the trigger is initiated after any update of the relation account is executed An SQL update statement could update multiple tuples of the relation, and the for each row clause in the trigger code would then explicitly iterate over each updated row The referencing new row as clause creates a variable nrow (called a transition variable), which stores the value of an updated row after the update The when statement speci es a condition, namely nrowbalance < 0 The system executes the rest of the trigger body only for tuples that satisfy the condition The begin atomic end clause serves to collect multiple SQL statements into a single compound statement The two insert statements with the begin end structure carry out the speci c tasks of creating new tuples in the borrower and loan relations to represent the new loan The update statement serves to set the account balance back to 0 from its earlier negative value The triggering event and actions can take many forms: The triggering event can be insert or delete, instead of update For example, the action on delete of an account could be to check if the holders of the account have any remaining accounts, and if they do not, to delete them from the depositor relation You can de ne this trigger as an exercise (Exercise 67) As another example, if a new depositor is inserted, the triggered action could be to send a welcome letter to the depositor Obviously a trigger cannot directly cause such an action outside the database, but could instead add a tuple to a relation storing addresses to which welcome letters need to be sent A separate process would go over this table, and print out letters to be sent

The McGraw Hill Companies, 2001

tion command Here s an example:

Component Link Variable Commission Hurdle Hurdle: All products must be at 75% of quota, before the second commission rate can be earned on any product Product Categories Digital Component Service Assemblies Contracts Products 4% 2% 10% 6% 3% 15%

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To see the status of ARP inspection and your configuration, use the show arp-inspecciscoasa# show arp-inspection interface arp-inspection miss ----------------------------------------------------

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Once you have enabled ARP inspection, to examine the local ARP table on the appliance, use the show arp command Here s an example: