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scheme is to develop a scheme for generating unique timestamps Then, the various protocols can operate directly to the nonreplicated environment There are two primary methods for generating unique timestamps, one centralized and one distributed In the centralized scheme, a single site distributes the timestamps The site can use a logical counter or its own local clock for this purpose In the distributed scheme, each site generates a unique local timestamp by using either a logical counter or the local clock We obtain the unique global timestamp by concatenating the unique local timestamp with the site identi er, which also must be unique (Figure 192) The order of concatenation is important! We use the site identi er in the least signi cant position to ensure that the global timestamps generated in one site are not always greater than those generated in another site Compare this technique for generating unique timestamps with the one that we presented in Section 1923 for generating unique names We may still have a problem if one site generates local timestamps at a rate faster than that of the other sites In such a case, the fast site s logical counter will be larger than that of other sites Therefore, all timestamps generated by the fast site will be larger than those generated by other sites What we need is a mechanism to ensure that local timestamps are generated fairly across the system We de ne within each site Si a logical clock (LCi ), which generates the unique local timestamp The logical clock can be implemented as a counter that is incremented after a new local timestamp is generated To ensure that the various logical clocks are synchronized, we require that a site Si advance its logical clock whenever a transaction Ti with timestamp <x,y> visits that site and x is greater than the current value of LCi In this case, site Si advances its logical clock to the value x + 1 If the system clock is used to generate timestamps, then timestamps will be assigned fairly, provided that no site has a system clock that runs fast or slow Since clocks may not be perfectly accurate, a technique similar to that for logical clocks must be used to ensure that no clock gets far ahead of or behind another clock.

Many commercial databases today support replication, which can take one of several forms With master slave replication, the database allows updates at a primary site, and automatically propagates updates to replicas at other sites Transactions may read the replicas at other sites, but are not permitted to update them An important feature of such replication is that transactions do not obtain locks at remote sites To ensure that transactions running at the replica sites see a consistent

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Switching is a technology that reduces congestion You can purchase switches that support Ethernet, Token Ring, and other media types When upgrading from 10 Mbps Ethernet to 100 Mbps Ethernet, acquiring the compatible hubs, network interface cards (NICs), and cabling may be costly Switches provide an alternative solution to improve network performance by eliminating contention for the same bandwidth Prior to the introduction of switches, connections from each workstation were run to the network closet and then typically terminated in a hub or bridge Switches became popular in the mid-1990s as a way to create smaller collision domains on LANs These smaller collision domains reduce

The McGraw Hill Companies, 2001

In early DBMSs, there was a close connection between a database and computer programs that accessed the database Essentially, the DBMS was considered part of a programming language As a result, the database definition was part of the computer programs that ac cessed the database In addition, the conceptual meaning of a database was not separate from its physical implementation on magnetic disk The definitions about the structure of a database and its physical implementation were mixed inside computer programs The close association between a database and related programs led to problems in soft ware maintenance Software maintenance encompassing requirement changes, corrections, and enhancements can consume a large fraction of software development budgets In early DBMSs, most changes to the database definition caused changes to computer programs In many cases, changes to computer programs involved detailed inspection of the code, a labor-intensive process This code inspection work is similar to year 2000 compliance where date formats were changed to four digits Performance tuning of a database was dif ficult because sometimes hundreds of computer programs had to be recompiled for every change Because database definition changes are common, a large fraction of software maintenance resources were devoted to database changes Some studies have estimated the percentage as high as 50 percent of software maintenance resources

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contention for bandwidth on a LAN and thus improve performance A switch behaves similarly to a bridge but offers higher performance

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