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LBF was introduced in version 62 LBF uses one of the Ethernet interfaces on the appliance to communicate with its mate Cisco uses a proprietary IP protocol for the communications, where both appliances will need IP addresses on the LBF interface to communicate with each other This interface must be dedicated to failover it cannot be used for data functions; however, you could easily set up a trunk connection on an interface, where one VLAN would be dedicated to failover communications and other VLANs for data communications Cisco originally designed LBF for companies that do not want to place the paired appliances physically close to each other For example, if you have a campus network and the building the appliances are in loses power, failover doesn t do you any good; however, if you could place the appliances in different buildings, when one building loses power, you still have an appliance in the second building that can process traffic And since you can use fiber to connect the appliances in the two buildings (this would require a copper-to-fiber transceiver for RJ-45 Ethernet interfaces), the buildings could be separated by a few kilometers Given its advantages, LBF does have two limitations: first, unlike the serial cable, LBF cannot directly detect that a mated pair has lost power it must use keepalives to detect this (which is discussed later in the Failover Operation section) Therefore, failover will take a little bit longer to occur in this situation Second, certain kinds of failures cannot be detected if a crossover cable is used to connect the two appliances For example, when you re using a crossover cable and directly connecting the two appliances together, if an interface failure occurs on the failover link, the two appliances will be unable to determine which of the two interfaces is causing the problem Actually, in version 6, you couldn t use a crossover cable; this has been added in version 7 Cisco recommends that you connect the appliances together either via a switch, where the failover connection is in its own VLAN, or via a hub.

To implement the rst step, the query optimizer must generate expressions equivalent to a given expression It does so by means of equivalence rules that specify how to transform an expression into a logically equivalent one We describe these rules in Section 1431 In Section 144, we describe how to choose a query-evaluation plan We can choose one based on the estimated cost of the plans Since the cost is an estimate, the selected plan is not necessarily the least costly plan; however, as long as the estimates are good, the plan is likely to be the least costly one, or not much more costly than it Such optimization, called cost-based optimization, is described in Section 1442 Materialized views help to speed up processing of certain queries In Section 145, we study how to maintain materialized views that is, to keep them up-to-date and how to perform query optimization with materialized views

The cost of an operation depends on the size and other statistics of its inputs Given an expression such as a 1 (b 1 c) to estimate the cost of joining a with (b 1 c), we need to have estimates of statistics such as the size of b 1 c In this section we rst list some statistics about database relations that are stored in database system catalogs, and then show how to use the statistics to estimate statistics on the results of various relational operations One thing that will become clear later in this section is that the estimates are not very accurate, since they are based on assumptions that may not hold exactly A query evaluation plan that has the lowest estimated execution cost may therefore not actually have the lowest actual execution cost However, real-world experience has shown that even if estimates are not precise, the plans with the lowest estimated costs usually have actual execution costs that are either the lowest actual execution costs, or are close to the lowest actual execution costs

The stateful link, if stateful failover is enabled, is used to replicate state information between the appliances, like the conn and xlate tables, among other things The state link must be an Ethernet interface; on the PIXs, you can t use the serial interface Because of the amount of information that might have to be replicated, Cisco recommends that you don t use a data interface for this function Either use a dedicated interface or, if you are using LBF, have both LBF and the state information run on the same interface