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Which type of data file access allows access to any piece of data in the file without reading the data that comes before it?
Direct access. AS
What is a structural dependence?
A file system exhibits structural dependence, which means that access to a file is dependent on its structure. For example, adding a customer date-of-birth field to the CUSTOMER, Given this change, none of the previous programs will work with the new CUSTOMER file structure. Therefore, all of the file system programs must be modified to conform to the new file structure. In short, because the file system application programs are affected by change in the file structure, they exhibit structural dependence. Conversely, structural independence exists when it is possible to make changes in the file structure without affecting the application program’s ability to access the data.
What is structural dependence?
A file system exhibits structural dependence, which means that access to a file is dependent on its structure. For example, adding a customer date-of-birth field to the CUSTOMER, Given this change, none of the previous programs will work with the new CUSTOMER file structure. Therefore, all of the file system programs must be modified to conform to the new file structure. In short, because the file system application programs are affected by change in the file structure, they exhibit structural dependence. Conversely, structural independence exists when it is possible to make changes in the file structure without affecting the application program’s ability to access the data.
How data was stored before MS access and what were the disadvantages of that mannual file system?
By using file System...
Why should computers have a file structure in place?
Computers should have a file structure in place to organize and manage data efficiently. A file structure helps users easily locate and access files, improves system performance, and ensures data is stored in a logical and structured manner.
What is the file structure database that Microsoft originally designed for floppy disks?
The file structure database that Microsoft originally designed for floppy disks is called "Microsoft Access." However, it's important to note that Access itself was not specifically designed for floppy disks; rather, it evolved as a desktop database management system for Windows environments. Before Access, Microsoft developed the "dbase" file format for database management, which was popular during the early days of personal computing and was frequently used on floppy disks.
How does MS-DOS implement random access to file?
MS-DOS implements random access to files using a combination of file control blocks (FCBs) and the file system's structure. When a file is opened, the system retrieves its FCB, which contains information such as the file's size and current position. Random access is achieved by allowing the user to move the file pointer to any position within the file using commands like SEEK, enabling read and write operations from that specific location without needing to read through the entire file sequentially. This direct access is facilitated by the underlying disk structure and the way MS-DOS manages file I/O operations.
Which type of data access allows access to any piece of data in the file without reading the data that comes before it?
Direct access. AS
What is the difference between data dependency and structural dependency?
Structural dependence-Access to a file depends on its structure i.e. adding customer date-of-birth field to customer file require the five steps described in slide 29. the reason for this is that the file structure is coded within the programData dependence-Changes in database structure affect program's ability to access data i.e. changing field from integer to decimal required changes in all the files. the reason for this is that the file data characteristics are coded within the program.
How does unix access a file from a directory?
Unix accesses a file from a directory using a hierarchical file system structure. When a command is executed to access a file, the Unix kernel navigates through the directory tree, starting from the root directory, to locate the specified path. Each directory contains entries that map file names to their corresponding inode numbers, which store metadata and point to the actual data blocks on disk. By reading the inode, Unix can access the file's content efficiently.
What is structural independence?
exist when it is possible to make changes in the file structure without affecting the application program's ability to access the data.
A utility in access that should be run every day before closing the database file to make the file more efficient and manageable?
Compact and repair
