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Questions and Answers
A direct/hashed file organization uses sequential ordering to access records.
A direct/hashed file organization uses sequential ordering to access records.
False
A pile organization is the most complex form of file organization and is suitable for many applications.
A pile organization is the most complex form of file organization and is suitable for many applications.
False
Indexed files utilize multiple indexes, which makes them ideal for applications requiring quick data retrieval.
Indexed files utilize multiple indexes, which makes them ideal for applications requiring quick data retrieval.
True
The read operation in a file system allows a process to perform operations on an existing file.
The read operation in a file system allows a process to perform operations on an existing file.
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A file system interacts with applications and can utilize caching, buffering, and asynchronous ______ to avoid latency.
A file system interacts with applications and can utilize caching, buffering, and asynchronous ______ to avoid latency.
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In file organization, a ______ file collects data in arrival order and is considered the least complex form.
In file organization, a ______ file collects data in arrival order and is considered the least complex form.
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An ______ file organization improves random access by adding a file index and an overflow file.
An ______ file organization improves random access by adding a file index and an overflow file.
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The ______ operation in a file system allows a process to define and position a new file within the structure.
The ______ operation in a file system allows a process to define and position a new file within the structure.
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The ______ attribute of a file includes the creation, last modification, and last access times.
The ______ attribute of a file includes the creation, last modification, and last access times.
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Study Notes
File Management
- A file system organizes data into files and directories, controlling access through interfaces and permissions.
- File systems interact with applications using caching, buffering, and asynchronous I/O to prevent disk latency.
- Key properties of a file system include long-term storage, sharability between processes, a good structure for specific applications.
File System Terms
- Field: The basic data element with a fixed or variable length and data type. Fields can contain values like dates, names, or sensor readings.
- Record: A collection of related fields treated as a unit by applications. Records can have fixed or variable lengths Examples include employee records.
- File: A collection of similar records treated as a single entity. Files have a name and are referenced by name. Access control restrictions often apply at the file level.
- Database: A collection of related data with explicit relationships. Used for projects, or organizations. A database can be composed of one or more files.
File Operations
- Create: Establishing a new file in the file structure.
- Delete: Removing a file from the structure, potentially obliterating it.
- Open: Allowing a process to perform operations on an existing file.
- Close: Preventing a process from further interacting with the file.
- Read: Retrieving data from a file, possibly in parts.
- Write: Modifying a file by adding or changing data, potentially changing the file's size.
File Attributes
- File Name: A human-readable name for the file.
- Identifier: A unique tag identifying the file within the system.
- File Type: Information for systems supporting different file types.
- Location: A pointer to the file's location on a device.
- File Size: The current size of the file in bytes, words, or blocks.
- Protection: Access control details determining permitted operations (read, write, execute) and who can perform them.
- Timestamp: Creation, last modification, and last access times.
File Organization
- Pile organization: The simplest form, where data are collected chronologically, less efficient for most applications.
- Sequential organization: A fixed-length structure. Records have identical format. Records are ordered, useful for batch processing.
- Indexed Sequential organization: Combines sequential order with an index to locate records faster. Uses an index for quick location, and an overflow file for records that don't fit the sequence.
- Indexed organization: Uses multiple indexes (one for each searchable field) for rapid random access, Records are accessed solely through the indexes.
- Direct/Hashed organization: Records are accessed directly by address. Suitable for frequent access and fixed-length records.
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Description
This quiz covers the essentials of file management and the principles of file systems. Explore key terms such as fields, records, files, and databases, as well as their roles in organizing and accessing data efficiently. Ideal for anyone looking to understand how data is structured and managed in computing environments.
