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3-0-1 File Directories Associated with a le is a directory The directory contains information describing the owner, the position, and the format of the records comprising the le Di erent types of le organization put di erent requirements on the contents of the le directory Much of the information kept in the directory is associated with storage allocation and is managed by the operating system The directory information also is kept in a le, since it must be persistent as well The owner of this le is the operating system itself, although it may permit read-access by others, for instance by the le management programs If multiple computers are used, the directory may be partially replicated in all computers so that the right computer can be selected if a particular le is needed

int compare(const CharType *str) const;

In this book, the operator name restrict is used to avoid confusion with the SQL SELECT statement The operator is more widely known as select

Table 3-0

Elements of a le directory Example Payroll "Joe Paymaster" Payroll dep 25DEC85 diskdrive disk5 T12B3000 ISAM 60 40 353 T23B2234 1JAN86

int compare(size_type indx, size_type len, const CharType *str, size_type len2 = npos) const;

Directory eld File name Owner Access group Create-date Device-type Device-name Begin-point Organization Maxsize Size allocated Size used End-of- le pointer Last-used date

3

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We show directory information, as typically kept for each le, in Table 3-0 The names of the owners and authorized users for the le are coded to match the access authorization mechanism for the computer system More on users and their access rights is presented in Chap 12-2 The allocation information speci es where and how much storage is allocated to a le The precise content and organization of a le directory varies greatly among operating systems Some of the information may be kept in a header record associated with the le rather than in the directory itself The important elements for access to a le are the name, the begin point, its size or end point, and its organization or structure The operating system mainly provides a space with a name attached Within this named space individual pages or blocks can be addressed, read, and stored Most operating systems permit les to grow, so that the size can vary over time Methods used by the operating system to keep track of the storage allocated to a le are presented in Chap 6-5-1

size_type copy(CharType *str, size_type len, size_type indx = 0) const;

Accessing the Directory A practical procedure to deal with directory records is to read these records once, when a computation begins using the le, and retain the information in memory for further reference Acquisition of directory information is performed during opening of a le When closing the le, the le directory will be updated if changes in the le have occurred that should be re ected in the directory System crashes can damage les by failing to update directory records Data recently stored may then not be accessible

Result of Restrict Operation on the Sample Offering Table (TABLE 34)

3-0-2 File Description and Use For each fundamental le organization we provide a description and the type of application it is suitable for In these descriptions de nitions will be encountered that are relevant for the subsequent le organization methods Some general criteria for organizing data are 1 Little redundancy 2 Rapid access 3 Ease of update 4 Simple maintenance 5 High reliability These criteria may con ict, and di erent le organizations will have a di erent balance of satisfying these criteria Reliability is the most complex of these issues and is treated separately in Chap 11 For economy of storage, we want to store data with little redundancy Redundancy exists when data elds are duplicated in multiple records Redundancy of data elements also increases the e ort required when values of data elements have to be changed, since we expect all copies of a data element to present a consistent description of the world Redundancy can be useful to provide rapid access to data; it is in fact the primary tool used to increase performance For instance, in Chap 5 we will use indexes, which repeat terms used in the le, to rapidly access records containing these terms, just as the index to this book is meant to be used

const CharType *data( ) const; bool empty( ) const;

Sec 3-0

CourseNo IS320 IS480 OffTerm SPRING SPRING OffYear 2006 2006 OffLocation BLM214 BLM302 OffTime 8:30 AM 10:30 AM FacSSN 098-76-5432 987-65-4321 OffDays MW MW

Table 3-1

Table 36-1

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