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For ICMP, the following criteria are used to remove entries from the state table: The ICMP connection is idle for more than 2 seconds by default The connection is removed from the appliances tables with the clear xlate command

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Skew is a major problem, especially with increasing degrees of parallelism Balanced partitioning vectors, using histograms, and virtual processor partitioning are among the techniques used to reduce skew In interquery parallelism, we run different queries concurrently to increase throughput Intraquery parallelism attempts to reduce the cost of running a query There are two types of intraquery parallelism: intraoperation parallelism and interoperation parallelism We use intraoperation parallelism to execute relational operations, such as sorts and joins, in parallel Intraoperation parallelism is natural for relational operations, since they are set oriented There are two basic approaches to parallelizing a binary operation such as a join In partitioned parallelism, the relations are split into several parts, and tuples in ri are joined with only tuples from si Partitioned parallelism can only be used for natural and equi-joins In fragment and replicate, both relations are partitioned and each partition is replicated In asymmetric fragment-and-replicate, one of the relations is replicated while the other is partitioned Unlike partitioned parallelism, fragment and replicate and asymmetric fragment-and-replicate can be used with any join condition Both parallelization techniques can work in conjunction with any join technique In independent parallelism, different operations that do not depend on one another are executed in parallel In pipelined parallelism, processors send the results of one operation to another operation as those results are computed, without waiting for the entire operation to nish Query optimization in parallel databases is signi cantly more complex than query optimization in sequential databases

Up through version 6 of the operating system, the PIXs required you to define address translation policies to move traffic through the appliance: inbound and outbound The primary reason for this behavior is based on the very beginnings of the PIX operating system: it was designed as an address translation device And this was very apparent through version 6 of the OS Starting in version 7, address translation is optional and disabled by default However, once you require address translation, you must define a translation policy for all traffic that will flow through the appliance inbound or outbound otherwise the appliance will drop the traffic The one exception to this rule is if two interfaces have the same security level, and address translation is enabled; in this instance, you can optionally define translation policies for the two interfaces, or just have traffic moved between the interfaces without address translation When you enable address translation, the translations that represent a device or a connection are stored in a separate table, called a translation or, more commonly, an xlate table Entries are removed from this table when any of the following occur: Network Address Translation (NAT) entries are removed from the table once they are idle for a time (by default 3 hours) You can control this with the timeout xlate command Port Address Translation (PAT) entries are removed from the translation table when the corresponding connection in the state table expires NAT and PAT entries are both removed from the table when they match criteria in the clear xlate command

Decision-support queries I/O parallelism Horizontal partitioning Partitioning techniques Round-robin Hash partitioning Range partitioning Partitioning attribute Partitioning vector Point query

To illustrate how the appliance deals with translations and connections, examine Figures 5-3 and 5-5 I ll use telnet, which uses the TCP protocol, as an example, and I ll assume that address translation is required on the appliance Also, I ll assume the source (100111) is connected to the inside interface and that the destination (172262650) is beyond the outside interface In this example, I ll only focus on the things that occur during the TCP three-way handshake

The McGraw Hill Companies, 2001

Examine Figure 5-4: The first thing that happens is that the source opens a telnet connection to the destination, setting the SYN flag in the TCP header The other connection

Range query Skew Execution skew Attribute-value skew Partition skew Handling of skew Balanced range-partitioning vector Histogram Virtual processors Interquery parallelism Cache coherency Intraquery parallelism Intraoperation parallelism Interoperation parallelism Parallel sort Range-partitioning sort Parallel external sort merge Data parallelism Parallel join

120 110 100 90 80 638 475 313 15 98