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A record type is a data type that describes such values and variables. Most modern programming languages allow the programmer to define new record types. The definition includes specifying the data type of each field and an identifier (name or label) by which it can be accessed. In type theory, product types (with no field names) are generally ...
A self-contained collection of information about a single object; a record is made up of a number of distinct items, called fields. In record-oriented filesystems, a record is a basic unit of device-to-program data transfers. Files in record-oriented filesystems are structured collections of records. Records may have a fixed length or variable ...
Fields may be stored in a random access file. [7] A file may be written to or read from in an arbitrary order. To accomplish the arbitrary access, the operating system provides a method to quickly seek around the file. [8] Once the disk head is positioned at the beginning of a record, each file field can be read into its corresponding memory field.
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Any file containing an executable program file that is currently running on the computer system as a program (e.g. an EXE, COM, DLL, CPL or other binary program file format) is normally locked by the operating system itself, preventing any application from modifying or deleting it. Any attempt to do so will be denied with a sharing violation ...
Record-oriented filesystems can be supported on media other than direct access devices. A deck of punched cards can be considered a record-oriented file. A magnetic tape is an example of a medium that can support records of uniform length or variable length. In a record file system, a programmer designs the records that may be used in a file.
Records in a direct data set can contain user-specified recorded keys of up to 255 bytes—all keys in a file must be the same length. Reads and writes can specify a key in addition to a disk address, and BDAM will search starting at the requested block up to the entire area of the file for a record with a matching key. [2]
Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.