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le organization As a dependent part they will use logical segments, which are connected by next and prior pointers to the real segment instances to be indexed A plethora of additional options to control storage and linkage is available Traditional database education does little to prepare a programmer to make decisions which deal with systems of this complexity while attempting to provide reliable, responsive, and cost-e ective service to the folks who require the information hidden in the database The database administrator may need some automatic design tools 9-7 ADVANCES IN IMPLEMENTATION
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The systems we presented in this chapter have a long history Many of their design concepts were developed in the late 1960s or early 1970s They are important now because of their maturity They can handle nontrivial databases, have the backup and reliability mechanisms necessary in a multiuser environment, and are known to a wide range of data-processing professionals At the same time they tend to lack features we would like to see in more advanced systems We will discuss such features now without citing speci c systems It is hard to predict commercial success of any new system; much depends on marketing and nancing No new system we investigated includes all or even most of these features 9-7-1 Distribution of Databases If data are distributed, schemas at each site have to carry information about remote as well as about local data A local subschema has only to keep track of remote elements which may be requested by queries originating at the site of the subschema Such subschemas will contain de nitional entries for the data elements at other sites, but only the names and sites of attributes at remote sites have to be kept in the storage schema section Even then the distributed schemas may become large and di cult to maintain, since schema information is replicated over multiple sites Some of the data may be replicated onto more than one site A retrieval request needs only to be directed to the site which is easiest to reach or has the lowest load An update has to be directed to all copies of the data To execute a transaction which involves multiple sites, those portions of the transaction which cannot be executed locally will be transformed into subtransactions to be transmitted over the communication links for execution at the remote sites For optimization of transactions on distributed databases the following points need to be considered:
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Which sites contain the requested data elements
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What is the expected partial result or data-segment size for the subtransaction This question is repeated after each processing step
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Communication capability What are the data transmission capabilities, ie, the available data transfer rates, between the sites Processing capability What is the capability of various sites to carry out any required processing Especially joins or partial joins (see Sec 9-3-5) are important
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Sec 9-7
Result site
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Is the nal output required at the site of the request, at another site, or anywhere in the net The last case applies to subtransactions creating data segments for further processing If one node has all this information, the query can be preplanned at one site, and all the subtransactions can be generated and scheduled there Linear programming algorithms have been used to solve such problems, at least for the case without replicated data It can, however, be impractical to provide all other nodes with procedures for estimation of remote data-segment sizes, since the data volume and key distribution at a site will uctuate The global performance of these schemes is unfortunately critically dependent on data-segment sizes, since the transfer rates across communication links tend to be an order of magnitude slower than those of storage devices In that case only primitive retrieval subtransactions will be spawned, and optimization will proceed step by step, as the data-segment sizes become known Current systems tend to rely on programmer decision to handle such problems
9-7-2 Multimodel Capability We nd instances where programmed, navigational access appears to be appropriate to look for speci c instances in a database For a single user a hierarchical view is often clear and adequate Relational queries provide the most generality and manipulability Relational formulations may also be appropriate as an intermediate interface for queries stated in a natural language such as English or in an interactive manner on on-line terminals, perhaps with graphics Translation of navigational queries on a relational implementation is equally feasible, but e cient execution may be di cult We discuss such issues in Chap 10
9-7-3 Choice of Access Structures A database system should be able to support a wide variety of query types and the corresponding updates Most relational systems will process a query using indexes if indexes are available for the search arguments Similarly other access constructs which use locality, pointers, etc, can be used to permit general and e cient retrieval capability on any database structure We are aware that locality is central to good retrieval performance In order to increase locality for critical data, it is often desirable to replicate data elements Replication does increase update and storage costs, but its bene ts can outweigh these costs, especially for data which are read much more frequently than updated The database systems should deal formally with replicated data, so that updates will be correctly and completely executed Some experiments have been made on relational systems; the process was called denormalization, and demonstrated its feasibility In current systems this technique is used only in an ad hoc fashion during database design, and the correctness of updates has to be assured by user programs
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