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NOTE The one exception where the IP and MAC addresses don t change between the appliances when a failover occurs is when using LAN-based failover (LBF) the LBF interface itself will keep the original IP/MAC addresses; however, the data interfaces will have their addresses swapped between the two units LBF is discussed in the Failover Cabling section

The McGraw Hill Companies, 2001

In the active/active implementation of failover, both appliances in the failover pair process traffic To accomplish this, two contexts are needed, as is depicted in the right side of Figure 23-3 On the left appliance, CTX1 performs the active role and CTX2 the standby role the roles are reversed for the two contexts on the other appliance Then, static routes on the connected routers are used to load-balance traffic between the two contexts, assuming they are running in routed mode If the contexts are running in transparent mode, then the connected routers could use a dynamic routing protocol to learn of the two equal-cost paths through the contexts to the routers on the other side NOTE Failover can occur if a context fails (context based) or if the entire appliance fails (unit based)

ory, which is important in systems where multiple queries may be running at the same time Graefe et al [1998] describes the use of hash joins and hash teams, which allow pipelining of hash-joins by using the same partitioning for all hash-joins in a pipeline sequence, in the Microsoft SQL Server Graefe [1993] presents an excellent survey of query-evaluation techniques An earlier survey of query-processing techniques appears in Jarke and Koch [1984] Query processing in main memory database is covered by DeWitt et al [1984] and Whang and Krishnamurthy [1990] Kim [1982] and Kim [1984] describe join strategies and the optimal use of available main memory

The McGraw Hill Companies, 2001

Two types of connections can be used for failover: Failover cable or link Stateful cable or link

Query optimization is the process of selecting the most ef cient query-evaluation plan from among the many strategies usually possible for processing a given query, especially if the query is complex We do not expect users to write their queries so that they can be processed ef ciently Rather, we expect the system to construct a query-evaluation plan that minimizes the cost of query evaluation This is where query optimization comes into play One aspect of optimization occurs at the relational-algebra level, where the system attempts to nd an expression that is equivalent to the given expression, but more ef cient to execute Another aspect is selecting a detailed strategy for processing the query, such as choosing the algorithm to use for executing an operation, choosing the speci c indices to use, and so on The difference in cost (in terms of evaluation time) between a good strategy and a bad strategy is often substantial, and may be several orders of magnitude Hence, it is worthwhile for the system to spend a substantial amount of time on the selection of a good strategy for processing a query, even if the query is executed only once

The following sections will discuss the differences between these two types of cables or links, as well as how to cable up the appliances

Consider the relational-algebra expression for the query Find the names of all customers who have an account at any branch located in Brooklyn This expression constructs a large intermediate relation, branch 1 account 1 depositor However, we are interested in only a few tuples of this relation (those pertaining to branches located in Brooklyn), and in only one of the six attributes of this relation Since we are concerned with only those tuples in the branch relation that pertain to branches located in Brooklyn, we do not need to consider those tuples that do not

The failover link is used to replicate appliance commands and to share information about the status of failover between the failover pair This link must be a dedicated connection between the two appliances, where no user traffic is allowed There are two kinds of failover links: Serial LAN-based failover (LBF)