Storage and file structure

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  • Database Management Systems: Chapter 1 - Disk Storage, Basic File Structures, and Hashing includes Disk Storage Devices, Files of Records, Operations on Files, Unordered Files, Ordered Files, Hashed Files, RAID Technology.

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  • Chapter 11: Disk Storage and Indexing Structures for Files provides about Disk Storage Devices, Files of Records, Indexing Structures for Files (Types of Single-level Ordered Indexes, Multilevel Indexes, Indexes on Multiple Keys).

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  • Database System: Chapter 9 - Disk Storage and Indexing Structures for Files presents about Disk Storage Devices (Preferred secondary storage device for high storage capacity and low cost, Data stored as magnetized areas on magnetic disk surfaces,...), Files of Records, Indexing Structures for Files.

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  • Chapter "Data storage and indexing structures for files" includes content: Storage hierarchy, storage of databases, storage area networks, indexes, Single-Level Ordered Indexes, Multi-Level Indexes,... Inviting you to refer lecture for more information.

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  • Chapter 11 probe below the higher levels as we describe various methods for implementing the data models and languages presented in preceding chapters. This chapter presents the following content: Overview of physical storage media, magnetic disks, raid, tertiary storage, storage access, file organization, organization of records in files, data­dictionary storage.

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  • Chapter 10 - Storage and file structure. In this chapter, we probe below the higher levels as we describe various methods for implementing the data models and languages presented in preceding chapters. We start with characteristics of the underlying storage media, such as disk and tape systems. We then define various data structures that allow fast access to data.

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  • Chương này trình bày các vấn đề liên quan đến vấn đề lưu trữ dữ liệu (trên lưu trữ ngoài, chủ yếu trên đĩa cứng). Việc lưu trữ dữ liệu phải được tổ chức sao cho có thể cất giữ một lượng lớn, có thể rất lớn dữ liệu nhưng quan trọng hơn cả là sự lưu trữ phải cho phép lấy lại dữ liệu cần thiết mau chóng. Các cấu trúc trợ giúp cho truy xuất nhanh dữ liệu được trình bày là: chỉ mục (indice), B+ cây (B+-tree), băm (hashing) ... ...

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  • File System Structure File System Implementation Directory Implementation Allocation Methods Free-Space Management Efficiency and Performance Recovery Log-Structured File Systems NFS File-System Structure File structure Logical storage unit Collection of related information File system resides on secondary storage (disks). File system organized into layers. File control block – storage structure consisting of information about a file. Operating System Concepts 12.1 Silberschatz, Galvin and Gagne ©2002 Operating System Concepts 12.

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  • Nhưng trên thực tế thì chúng ta đã ít nhiều lưu trữ dữ liệu cá nhân trực tuyến khi sử dụng các phần mềm, ứng dụng chia sẻ trực tuyến, tán gẫu, trò chuyện với bạn bè...

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  • Chapter 8 introduce Data storage and indexing structures for files. This chapter includes content: Storage hierarchy, storage of databases, storage area networks, indexes, Single-Level Ordered Indexes, Multi-Level Indexes,... Inviting you to refer lecture for more information.

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  • This chapter is primarily concerned with issues surrounding file storage and access on the most common secondary-storage medium, the disk. We explore ways to structure file use, to allocate disk space, to recover freed space, to track the locations of data, and to interface other parts of the operating system to secondary storage. Performance issues are considered throughout the chapter.

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  • This chapter is primarily concerned with issues surrounding file storage and access on the most common secondary-storage medium, the disk. We explore ways to structure file use, to allocate disk space, to recover freed space, to track the locations of data, and to interface other parts of the operating system to secondary storage. Performance issues are considered throughout the chapter.

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  • File-System Structure File-System Implementation Directory Implementation Allocation Methods Free-Space Management Efficiency and Performance Recovery Log-Structured File Systems NFS Example: WAFL File System To describe the details of implementing local file systems and directory structures To describe the implementation of remote file systems To discuss block allocation and free-block algorithms and trade-offs File-System Structure File structure Logical storage unit Collection of related information File system resides on secondary storage (disks) File system organized into...

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  • “The System.IO namespace allows you to interact with a machine’s file and directory structure. Over the course of this chapter, you will learn how to programmatically create (and destroy) a directory system as well as move data into and out of various streams (file based, string based, memory based, etc.). The latter part of this chapter examines the role of isolated storage, which allows you to persist per-user data into a safe sandbox, regardless of the security settings of a target machine. To understand certain aspects of the System.IO.

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  • Every aspect of a network-storage, file transfers, backup-depends on the filesystem for structure, functionality, and integrity. Surprisingly, UNIX-the operating system of choice for mission-critical networks-has historically had little documentation on its filesystem structures. Written by Steve Pate, a sen-ior member of the VERITAS Filesystems Group, this book sheds light on the inner workings of UNIX filesystems and gives you the know-how to fine-tune your UNIX filesystems for optimal performance.

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  • Types of Segments Segments are space-occupying objects in a database. They use space in the data files of a database. This section describes the different types of segments. Table A table is the most common means of storing data within a database. A table segment stores that data for a table that is neither clustered nor partitioned. Data within a table segment is stored in no particular order, and the database administrator (DBA) has very little control over the location of rows within the blocks in a table. All the data in a table segment must be stored in one tablespace.

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  • Physical storage device: HDD, DVD-ROM  sector, track, cylinder • HDDs can be divided into separate storage devices called partitions A filesystem is the methods and data structures that an operating system uses to keep track of files on a disk or partition (the way the files are organized on the disk) • ext3 (third extended filesystem) 4 .5 .

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  • Complete these extracts from an ICT textbook by typing in terms from Exercise 1. You may have to use the plural form. 1 Portable DVD players usually support playback; this means the user can watch a wider variety of different file types (DivX, MP4, etc.). 2 differ from magnetic ones, in terms of both internal structure and storage capacity. 3 CDs and DVDs are read using a red . In discs, however, it is blue-violet, hence the name. 4 Unlike a CD, a DVD can be and , giving it a capacity of up to 17GB. 5 DVD drives are , meaning...

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  • Tablespaces and Data Files Databases, tablespaces, and data files are closely related, but they have important differences: An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database’s data. Each tablespace in an Oracle database consists of one or more files called data files, which are physical structures that conform with the operating system in which Oracle is running. A database’s data is collectively stored in the data files that constitute each tablespace of the database.

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  • As a database management system, the management of Oracle file structures is critically important to the successful operation of any system. The Oracle administrator must understand all levels of Oracle file management, including data file management principles, tablespace management principles, and the storage of individual objects within the tablespaces. As Oracle has evolved into one of the world's most complex database management systems, it is imperative that all Oracle professionals understand how their information is stored both at the logical and physical level.

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