Xem 1-20 trên 29 kết quả Disk data files
  • 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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  • [ Team LiB ] Recipe 5.4 Serializing Data Problem You need to serialize the contents of a DataSet so that you can store the data on a disk or transfer it across a network. Solution You can serialize a DataSet into XML, binary, or SOAP formats and save the serialized DataSet to a stream (such as a file or network stream).

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  • OVER THE PAST 30 YEARS I’VE WRITTEN 18 BOOKS on various programming topics. You might wonder, why so many…? Didn’t I get it right the fi rst time? Well, no, I didn’t…not really. When I wrote my fi rst book more than 30 years ago, object-oriented programming (OOP) was obscure at best and unknown to most. Like so many others, I had to go through the OOP learning process before I could appreciate what OOP was all about. I have a feeling that there are a lot of people out there who still feel that way. Each time I teach a programming class, I learn new...

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  • Encryption is the process of protecting data by using an algorithm to scramble it. The data is unintelligible, undetectable, unreadable and irretrievable unless a key is used to reverse the encryption, or decrypt, the data. Encryption is used all the time, often without you even realising it. Whenever you buy something online and make a transaction, all your details are heavily encrypted until they reach the other end, making sure that no third party could be listening in.

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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.

    ppt47p tangtuy06 01-04-2016 4 1   Download

  • Operating Systems interpret user commands and instructions (like typing on the keyboard or clicking with the mouse) and send requests to the proper application or device. An OS not only provides a user interface (text or graphic) to access/organize/manipulate/store data, but can also provide security and multitasking capabilities. Generally the OS is made up of a few core files with additional files for extended functionality and backward capability.

    pdf93p vutrung 04-09-2009 361 98   Download

  • GlusterFS is a Cluster File System that aggregates multiple storage bricks over InfiniBand RDMA into one large parallel network file system. GlusterFS is MORE than making data available over a network or the organization of data on disk storage…. GlusterFS allows scaling of capacity and I/O using industry standard inexpensive modules!

    pdf28p hanguyen 07-07-2009 220 73   Download

  • For information to be saved permanently on a disk, you can use a file. The file is a stream of characters or a flow of related data. Streams enable you to write and read bytes to and from a storage medium, respectively. Streams can be used to perform fundamental operations such as read and write. This chapter introduces the concept of the file input and output operations. It explains the process of reading and writing in the text files and the binary files. It also explains the process of browsing through the Windows File System. ...

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  • Before installing PROKON, we recommend you take a moment to study the folder tree that will be created during installation. The main components are: The main suite folder: This is the folder enclosing all program folders and is always called ’Prokon’. The main program folder: The folder that contains all the executable programs and other files that make up the system. The folder has a child folder where the Dos components of the suite reside. The default data folder: This is the folder used for data storage.

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  • One of the most important parts of running any computer system is handling data on disk. We have already looked at UNIX file handling in Chapter 10. In this chapter, we’ll look at two ways to add another disk to your system, and what you should put on them. In addition, we’ll discuss disk error recovery on page 218.

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  • Export and Import Utilities The Export utility provides a simple way for you to transfer data objects between Oracle databases, even if they reside on platforms with different hardware and software configurations. When you run Export against an Oracle database, objects (such as tables) are extracted, followed by their related objects (such as indexes, comments, and grants), if any. The extracted data is written to an Export file, which is an Oracle binary-format dump file that is typically located on disk or tape.

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  • Cross Checks of RMAN Backups and Copies Performing a cross check provides you with a way to ensure that data about backup sets and image copies in the RMAN repository is synchronized with corresponding data on disk or in the media management catalog. You can use the LIST command to obtain a report of the backups and copies that you have made and then use the CROSSCHECK command to check that these files still exist. If RMAN cannot find a file, it updates the repository records to EXPIRED. You can determine which files are marked EXPIRED by issuing a LIST EXPIRED command....

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  • Database Systems: Lecture 10 - Overview of Database Design Process includes Data Storage (Disk Storage Devices, Files of Records, Operations on Files, Unordered Files, Ordered Files, Hashed Files, RAID Technology), Indexing Structures for Files.

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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 6B - Measuring and improving drive performance. This chapter define the term average access time and describe how it is measured, explain why file compression is a factor in drive performance, define the term data transfer rote and describe how it is measured, explain two steps you can take to optimize the performance of your computer’s hard disk, identify four drive interface standards commonly used in PCs.

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  • Chapter 14 - Implementations of file operations. This chapter discusses the physical organization used in file systems. It starts with an overview of I/O devices and their characteristics, and discusses different RAID organizations that provide high reliability, fast access, and high data transfer rates. The arrangements used to implement device-level I/O are then discussed, including use of buffers and caches to speed up I/O operations and use of disk scheduling policies to improve throughput of disk devices.

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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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  • Creating Databases Oracle Databases can be created either using the Database Configuration Assistant or a CREATE DATABASE statement. Using the DBCA is easier. Creating the database manually requires careful planning. Additional actions such as creating new users, tablespaces and data dictionary tables have to be performed in case the database is created manually. To create the database: Make sure that there is sufficient memory and disk space. Specify Oracle SID. $ ORACLE_SID = slx_db01; EXPORT ORACLE_SID; Create initialization parameter file by copying sample parameter file init.ora.

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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 .

    pdf41p longmontran 15-01-2010 110 26   Download

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