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DESCRIPTIONS
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In order to permit implementation and use of a system by a number of people some documentation will have to exist to describe both the static aspects, the database structure, and the procedural aspects, the computations, which carry out the data transformations A picture of the data in terms of les, records, elds, and the relation between items of data contained in these elements is appropriate for the static aspect Concepts to guide the development of such descriptions are presented in Chap 7 Such a data-structure de nition may take the form of a document to be used by the people who program the le operations on this database It is even better to materialize the structure de nitions in the form of a collection of computer-readable codes, a schema which guides le processes automatically Much of the content of this book will be concerned with the design and use of such schemas Examples of schemas are presented in Chap 8 The procedural description may be given as a formula, a description of program sections to be executed, or a owchart In many commercial programming groups much e ort is put into systems analysis which prepares process descriptions in minute detail for subsequent implementation by coders It is easy for errors to develop because of communication problems between systems analysts and coders The analyst may assume that the coders are aware of conditions which are beyond their knowledge Coders, on the other hand, may program for cases which cannot occur The determination of critical sections is often a source of di culty No formal methods are yet adequate to fully verify correctness for interacting processes We therefore prefer detailed static data descriptions for the development of databases
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Static versus Procedural Descriptions
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De nitions and Introduction
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The static and procedural aspects often occur together when we describe les For many simple data-processing problems, however, no process descriptions are needed In those cases the computation is indirectly described by providing two pictures of a le, specifying the form and contents before and after the computation This method is also applicable to the movement of data between two separate les of a database The programmer uses the before and after layout charts to write the code Dispensing with the coding entirely is the intent of report generators, which accept the description of the source les and a layout of the output report which is desired Most processing steps are implied and created by the report generator system The same idea is the basis for many high-level query systems where an information-retrieval request is stated as a formula and its resolution is the task of a retrieval system Aspects of these approaches will be presented in Chap 9 At other times one may nd that the data organization is implicitly de ned by a listing of the steps of the process which puts the data into the database Much analysis is needed when new programs want access to data that have only been de ned procedurally The two choices available are implied in the existence of two terms for the description of storage structures: file organization versus access methods Special data elements, described and kept in the database, can be used to control program dynamics A data element of a database could state that a particular le has been completely updated by some computation Such information can be used to assure a correct execution sequence of programs that share data Data elements kept with each record may specify that certain records have not been updated yet, maybe because of lack of input data, such as hours worked by some employees Some computations could be programmed to decide not to proceed at all in that case; other processes would not be impeded unless they require one of the records which have not yet been brought up to date We refer to data which describe the state of the database for the control of computations as control data We see that there is a relationship between the quality or completeness of our description of the data and our ability to specify the program sections which are combined to form data-processing computations
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Flowcharts In order to describe complex processes and data ow, we sometimes have to resort to a graphic description of the dynamics of an algorithm, a flowchart as shown in Fig 1-7 In these we will distinguish three types of activity: Control ow, the sequence of instruction executed by the processing unit under various conditions This sequence is described when owcharts are used to document a programming algorithm Control-data ow, the ow of data elements whose e ect is on the control ow of the computations Typical examples are counts, references, control switches that indicate whether an operation is permitted, whether an area is full or empty, and so forth These may be set by one program and used by another program Data ow, the ow of the bulk of the coded data as it is moved, merged, and processed to generate information for the bene t of the users of the system This ow is typically between les, memory, and input or output devices
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Sec 1-6
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