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| | AARM95 - Sequential and Direct Files |
 | | For sequential access, the file is viewed as a sequence of values that are transferred in the order of their appearance (as produced by the program or by the external environment). | | | For direct access, the file is viewed as a set of elements occupying consecutive positions in linear order; a value can be transferred to or from an element of the file at any selected position. | | | A file object to be used for sequential access is called a sequential file, and one to be used for direct access is called a direct file. |
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http://www.ada-deutschland.de/AdaTourCD2004/dokumente/AARMHTM/AA-A-8.html
(488 words)
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| | Introduction to Direct Access Files |
| | Since disk access is one of the slowest things we can do in computing this is very wasteful of computer time when only a few records are involved. | | | Because Indexed files are direct access files they must be stored on direct access media such as a hard or floppy disks. | | | Because Relative files are direct access files they must be stored on direct access media such as a hard or floppy disks. |
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http://www.csis.ul.ie/COBOL/Course/Intro2DirectAccess.htm
(2730 words)
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| | File Access with Visual Basic |
| | Sequential access is used to work with files that are just plain text files. | | | Because of the number of steps required to make modifications to a file opened for sequential access, it may not be the most efficient method for modifying data in a text file particularly if the text file is relatively large. | | | A trade-off in using variable-length field and binary access instead of fixed-length fields and random access is that the entire record could be written with a single function call using random-access. |
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http://www.students.eng.wayne.edu/~af2604/be1010/fileiohelp.html
(3071 words)
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| | Random and Sequential Data Access |
| | Accessing data sequentially is much faster than accessing it randomly because of the way in which the disk hardware works. | | | Comparing random versus sequential operations is one way of assessing application efficiency in terms of disk use. | | | Because reading randomly involves a higher number of seek operations than does sequential reading, random reads deliver a lower rate of throughput. |
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http://www.microsoft.com/resources/documentation/Windows/2000/server/reskit/en-us/core/fnee_exa_kfys.asp?frame=true
(327 words)
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| | Chapter 7 |
| | Sequential access files work best when you need to process 100 records or less or a large file where records are always processed in consecutive order. | | | Our text describes three different types of data files: sequential, random, and binary. | | | To use the data file objects you must include the #include header. |
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http://www.wcnet.net/quicksilver/cosc1420/T13SequentialAccessFiles.htm
(847 words)
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| | DEFINE STGPOOL (Define a Storage Pool) |
| | Sequential access storage pools use device classes that you define for tape devices, optical devices, files on disk (FILE device type), and storage on another server (SERVER device type). | | | Specifies the name of the sequential access device class to which this copy storage pool is assigned. | | | The DEFINE STGPOOL command takes three forms, depending on whether you are defining a primary storage pool assigned to random access devices, defining a primary storage pool assigned to sequential access devices, or defining a copy storage pool (always assigned to sequential access devices). |
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http://www-backup.univie.ac.at/bookmgr/books/bookspdf/TSM51/sun/html/reference/anrsrf99.htm
(6207 words)
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| | Administrator's Guide |
| | Random access device types store data in blocks of storage that can be scattered across the available space on a disk. | | | For tape and optical sequential devices, the device class also specifies a library. | | | FILE is an ADSM sequential device type that allows the administrator to create sequential volumes by creating files on disk storage. |
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http://www.umiacs.umd.edu/~jhu/DOCS/ADSM/admgde/a45eaa22.htm
(457 words)
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| | 7.4 Random Access Files |
| | Windows and Linux don't differentiate sequential and random access files anymore than the CPU differentiates byte and character values in memory; it's up to your application to treat the files as sequential or random access. | | | The problem with sequential files is that they are, well, sequential. | | | As such, you use many of the same functions to manipulate random access files as you use to manipulate sequential access files; you just use them differently is all. |
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http://webster.cs.ucr.edu/AoA/Windows/HTML/Files3.html
(2174 words)
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| | [No title] |
| | For example, you might randomly access a particular record and then process the records after it in the file sequentially until a particular condition is met. | | | Essentially that means that there will be a data file and an index file used to access the data. | | | Organization indexed means that it is an indexed file with a primary index and possible alternate indexes that can be used to access the records. |
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http://www.bristol.mass.edu/pgrocer/cis51/Presentations/indexedbasic/indexedbasic.PPT
(524 words)
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| | topic6 |
| | Open a sequential access file for Output when you want to create a new file and then write data to it. | | | Both sequential files and menus are used frequently in developing Visual Basic programs. | | | An advantage to using sequential access files is that they are easy to create. |
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http://www.templejc.edu/dept/cis/jgarrett/vb/topic6.html
(1313 words)
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| | Overview: Volumes in Storage Pools |
| | Random access storage pools are always associated with the DISK device class, and all volumes are fixed-size files on a disk. | | | Volumes in sequential access storage pools include any supported device type to which the server writes data sequentially. | | | For scratch volumes that were acquired in a FILE device class, the space that the volumes occupied is freed by the server and returned to the file system. |
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http://webdocs.caspur.it/ibm/tsm-5.1.5/pase/html/guide/anrpgd5060.htm
(1924 words)
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| | Forced sequential access to specified domains in a computer network - Patent 6301618 |
| | The user has access to the computer networks through a work station or host computer 12. | | | The user of the host computer 12, having established such a connection, has the ongoing capability to access the specified domain until the connection is terminated either at the directive of the user or by error in data transmission. | | | An access point 14 is essentially an external location capable of permitting authorized users to access external computer networks, typically the access point consists of a series of Network Access Servers (NASs) and other related hardware, software and/or firmware. |
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http://www.freepatentsonline.com/6301618.html
(6948 words)
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| | Migration of Files in a Storage Pool Hierarchy |
| | You cannot migrate data from a sequential access storage pool to a disk storage pool. | | | Caching is a method of minimizing access time to files on disk storage, even if the server has migrated files to a tape storage pool. | | | If you need to move data from a sequential access storage pool to a disk storage pool, use the MOVE DATA command. |
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http://baserv.uci.kun.nl/documentatie/manuals/tsm/aix/html/guide/anragd84.htm
(3801 words)
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| | Creating a Sequential Access File - C++ |
| | As soon as your program is finished accessing the file, the file should be closed. | | | Closing the file writes any data remaining in the buffer to the file, releases the file from the program, and updates the file directory to reflect the file's new size. | | | Always close your files as soon as you are finished accessing information. |
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http://mathbits.com/MathBits/CompSci/Files/Create.htm
(326 words)
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| | Understanding IMS-DL/I Essentials : Physical Databases and Program Views |
| |
is a root-segment database, residing in main storage, which can be accessed to a field level. | | |
To create access and view descriptors to be used by the SAS/ACCESS interface to IMS-DL/I, you need to know how the DBA has defined the database fields. | | | A SAS task using the SAS/ACCESS interface to access an IMS-DL/I database must reference one and only one PSB. |
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http://cropandsoil.oregonstate.edu/sasdocs/books/acesims/phydbs.htm
(1888 words)
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| | Larken Sequential/Random Editor |
| | When a file is opened as a RND type, the file data pointer will be set to the start of the file so that the first data accessed will be the first in the file. | | | It's possible to read random access files while the write protect is on, but you won't be able to write new data to them. | | | Before you can use these commands to access a file on disk, you must first use the OPEN # command to create a file on the disk or re-open an existing file. |
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http://www.timexsinclair.org/2068/peripherals/Larken/larkenseq.html
(3922 words)
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| | Opening Files for Sequential Access (Visual Basic .NET) |
| | When you open a file for sequential access, you must specify whether to input characters from the file (Input mode), output characters to the file (Output mode), or append characters to the file (Append mode). | | | When you open a sequential file for Input, the file must already exist; otherwise an error occurs. | | | It is also more secure to write data to user directories than to the root directory or the Program Files directory. |
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http://msdn.microsoft.com/library/en-us/vbcn7/html/vaconOpeningFilesForSequentialAccess.asp?frame=true
(275 words)
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| | Sequential File I/O |
| | On UNIX systems, opening a sequential file in Caché for “WL” write access generally has no effect on the behavior of non-Caché applications. | | | All operating systems consider disk I/O files as sequential files. | | | A more serious situation can occur as follows: If one of these non-Caché applications opens a file, then Caché opens, modifies, and closes the file, then the non-Caché application saves changes to the file, the changes made by both processes are saved, and the integrity of the file data could be compromised. |
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http://platinum.intersystems.com/csp/docbook/DocBook.UI.Page.cls?KEY=GIOD_rmsseqfiles
(2793 words)
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| | Sequential Access Files - NetworkingProgramming.com |
| | 2 - File AccessLesson 29 studies file access in C++ using the ofstream and ifstream classes from fstream.h. | | | Using ignore to sort data from a sequential access file: | | | Using the getline() method and a delimiter character to sort data from a sequential file: |
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http://www.networkingprogramming.com/1024x768/c30.html
(720 words)
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| | Record Selection |
| | With non-RIO access, the internal structure of RIO blocks is transparent. | | | Note that the file system assumes the record to be updated has just been accessed in some way. | | | Successful read returns CCE condition code and transfer length; file error results in CCL condition code; end-of-file results in CCG condition code and returns a transfer length of zero. |
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http://docs.hp.com/en/32650-90885/ch07s02.html
(860 words)
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| | Sequential Access Data Files |
| | I want the sequential file to have the pathname and filename and that to load the picture as the image. | | | The manager (I'm hoping) will write the information into the sequential file, or update it as necessary(which I'm told is frequently). | | | If I understand you correctly, you want to have a sequential file... |
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http://www.daniweb.com/techtalkforums/post89463.html
(627 words)
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| | Xtreme Visual Basic Talk - Reading a Record from a Sequential access file |
| | how and where abouts do i code this sequential file in all of this mnu_file cmd code to be displayed on the same frm as where the user would go to input information to add a new homeowner into the database ? | | | I'm having problems with reading a record from a sequential access file. | | | Because you ask for Sequential File, So that is the reason I mention only Seq. |
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http://www.visualbasicforum.com/t105883.html
(2758 words)
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| | Working with Random Access Files |
| | The input and output streams in this lesson so far have been sequential access streams--streams whose contents must be read or written sequentially. | | | Using this algorithm, on average, you'd have to read half the ZIP archive before finding the file that you wanted to extract. | | | , it will work on some sequential access files (the ones that implemented |
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http://java.sun.com/docs/books/tutorial/essential/io/rafs.html
(359 words)
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| | Computer Dictionary Definition of Indexed Sequential Access Method |
| | ISAM was followed by VSAM ({Virtual Storage Access Method}) and pre-dated {relational databases}. | | | (ISAM) An {IBM} file management system allowing records to be accessed either sequentially (in the order they were entered) or via an index. | | | Displaying all Computer dictionary definition of Indexed Sequential Access Method |
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http://www.realdictionary.com/computer/Computer/Indexed-Sequential-Access-Method.asp
(134 words)
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| | f77 - 14,182 sequential_access |
| | sequential access A method for retrieving or storing data in which the data (record) is read from, written to, or removed from a file based on the logical order (sequence) of the record in the file. | | | (The record cannot be accessed directly.) Contrast with direct_access. |
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http://www.public.iastate.edu/~fortran/decfortran-axp/14,182.html
(61 words)
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| | SCSI-2 Spec - Sequential-access devices |
| | When spacing over sequential filemarks (or setmarks), the count field is interpreted as follows: a) A positive value N shall cause forward movement to the first occurrence of N or more consecutive filemarks (or setmarks) being logically positioned after the Nth filemark (or setmark). | | | Sequential-access devices (called devices below) optimize their use in storing or retrieving user data in a sequential manner. | | | Since access is sequential, position changes typically take a long time, when compared to direct-access devices. |
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http://dan.emsphone.com/scsi/SCSI2-10.html
(13844 words)
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| | ISAM - a Whatis.com definition - see also: Indexed Sequential Access Method |
| | ISAM (Indexed Sequential Access Method) is a file management system developed at IBM that allows records to be accessed either sequentially (in the order they were entered) or randomly (with an index). | | | ISAM was developed prior to VSAM (Virtual Storage Access Method) and relational databases. | | | ISAM - a Whatis.com definition - see also: Indexed Sequential Access Method |
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http://search390.techtarget.com/sDefinition/0,,sid10_gci214626,00.html
(177 words)
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| | Sequential Access Files |
| | It's more convenient to put the test data in a file and read it from there, or to write output to a file and examine it later. | | | Operating systems generally support two ways of accessing files on disk: random and sequential. | | | Sequential access restricts you to retrieving the information in order (sequentially) from the start of the file. |
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http://www.ucfv.bc.ca/cis/watkissc/200305/200305Comp150/files/files.htm
(220 words)
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| | QUERY MEDIA (Query Sequential Access Storage Pool Media) |
| | Use this command to display information about the sequential access primary and copy storage pool volumes moved by the MOVE MEDIA command. | | | Specifies that executable commands are built for the storage pool volumes processed by the QUERY MEDIA command. | | | If you do not specify a value for this parameter, output is not restricted by access mode. |
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http://webdocs.caspur.it/ibm/tsm-5.1.5/linux/html/reference/anrlrf50186.htm
(1520 words)
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| | ISAM - Indexed Sequential Access Method |
| | Indexed sequential access method — a means of storing data sequentially and retrieving it through use of a single index (as opposed to relational databases, which store data nonsequentially and may use many indexes to retrieve it). | | | More information about the definition of ISAM may appear below: | | | Definitions have been compiled from popular search engines and multiple results provided for your review. |
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http://www.auditmypc.com/acronym/ISAM.asp
(126 words)
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| | Storage Server for Processing Video Transactions through Sequential Access in Multimedia DBMS |
| | When the storage system serves multiple video stream requests, its bottlenecks come from the seeking delay caused by the random movement of disk head and from unfair disk access due to disk load unbalance among multiple disks.This paper presents a novel placement and retrieval policy for the storage system of multimedia DBMS. | | | So, the storage system of multimedia DBMS generally have the structure of disk array which consists of multiple disks. | | | The new policy retrieves the requested data through sequential access and maintaining disk load balance so that it can diminish the bottlenecks on retrieving and can provide the real time retrieval services for more users simultaneously. |
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http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/dante/1999/0496/00/0496toc.xml&DOI=10.1109/DANTE.1999.844956
(270 words)
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| | sequential-access |
| | of or pertaining to a storage medium, as magnetic tape, in which records must be accessed by reading or writing from the beginning of the file. | | | of or pertaining to file processing in which records are organized based on the sequence of keys contained in each record, and in which accessing a record necessitates first accessing all of the preceding records. |
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http://www.infoplease.com/ipd/A0646819.html
(78 words)
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| | Sequential access |
| | For example, a reel-to-reel[?] tape must be wound to the right position, whereas a pickup needle[?] can be immediately put down on any point of a long-playing vinyl record.----Sequential access is also an access type assigned to a computer file, for accessing records on a computer. | | | This is opposed to, say, indexed access, used for table look-up, and certain types of databases. | | | Sequential access is the property of a group of elements, that they must be accessed one after the other in a specific sequence. |
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http://www.termsdefined.net/se/sequential-access.html
(128 words)
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| | Sequential Access |
| | Positions the file, factor2, at the first record whose key is greater than or equal to value in factor1 | | | SETLL - Set Lower Limit - determines where access will start in reading records, positioning |
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http://www.dacc.cc.il.us/~janeb/rpg/CHAP6/sld004.htm
(34 words)
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| | Sequential access |
| | With sequential access the device must read or move through all information up to the point it is attempting to read or write to. | | | Also known as serial access, sequential access is a type of method of retrieving data from a storage device. | | | A tape drive is an examples of a sequential access drive, where the drive must move the tape forward or backwards until it reaches its destination. |
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http://www.computerhope.com/jargon/s/sequacce.htm
(88 words)
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| | sequential access - Enterprise Storage Forum, Leading Edge Coverage of the Storage Industry |
| | Some programming languages and operating systems distinguish between sequential-access data files and random-access data files, allowing you to choose between the two types. | | | A disk drive, on the other hand, is a random-access device because the drive can access any point on the disk without passing through all intervening points. | | | Refers to reading or writing data records in sequential order, that is, one record after the other. |
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http://enterprisestorageforum.webopedia.com/TERM/S/sequential_access.html
(188 words)
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| | Programming: VB Sequential Access File For Favorites in Web Browser |
| | Programming: VB Sequential Access File For Favorites in Web Browser | | | Get instant answers from Experts Exchange knowledge base | | | Does anyone know how to create a sequential access file that allows users to add a favorite, and remove one if they wish. |
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http://www.experts-exchange.com/Programming/Q_20825485.html
(292 words)
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| | Visual Basic 4. |
| | Close statement A. use to close a random access file B. syntax: Close(filenumber), where filenumber, is the number used in the Open statement VIII.Put statement A. use to write a record to a random access file B. syntax: Put #filenumber,[recordnumber],variablename 1. | | | Open statement A. use to create or open a random access file B. syntax: Open filename[For mode] As #filenumber LEN=reclength 1. | | | Len function A. use to determine the length of a record variable B. syntax: Len(variablename), where variablename is the name of the record variable VII. |
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http://www.farmingdale.edu/~sapirr/bcs185/vb4no8a.html
(232 words)
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| | Sequential Access - Computer & Technology Definitions |
| | The Computer Dictionary has attempted to verify all computer, tech, network, and internet terms contained in our Computer Dictionary. | | | The other common behavior is called random access. | | | This is the way that a cassette or video tape will behave. |
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http://www.computerdictionary.info/computer-term-details/Sequential-Access
(101 words)
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| | Backing Up Storage Pools |
| | When files are expired, deleted, or moved from a volume, they are not actually erased from the volumes: The database references to these files are removed. | | | When you define or update a sequential access storage pool, you can use the REUSEDELAY parameter. | | | Thus the file data may still exist on sequential volumes if the volumes are not immediately reused. |
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http://www-backup.univie.ac.at/bookmgr/books/bookspdf/TSM51/mvs/html/guide/anrmg170.htm
(894 words)
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| | dBforums - Help! Sequential File Access |
| | I am working with a VB application which sends and retrieves data from a textfile - when I lookup a record to return to the VB form, I get a 'Input Past End of File (Error 62)' message? | | | If it still doesn't work, please provide the code and let's try to sort it out. | | | dBforums > Data Access, Manipulation & Batch Languages > Delphi, C etc > Help! |
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http://www.dbforums.com/t726775.html
(129 words)
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| | Sequential Access Files |
| | Sequential files contain data elements that are stored one after another in sequence. | | | Records must be processed (read or written) in order, from beginning to end. |
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http://www.ac.cc.md.us/~dennisb/vblesson/sld004.htm
(36 words)
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| | sa(4) - SCSI Sequential Access device driver |
| | SCSI devices of the sequential access class that are attached to the system through a supported | | | Control mode device (to examine state while another program is accessing the device, e.g.). | | | It should be noted that tape devices are exclusive open devices, except in the case where a control mode device is opened. |
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http://www.gsp.com/cgi-bin/man.cgi?section=4&topic=sa
(892 words)
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| | Sequential file access |
| | Sequential processing of all records in a file | | | : To find a record in a file using a sequential search. |
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http://www.theteacher99.btinternet.co.uk/theteacher/newalevel/cp2_7_5.htm
(79 words)
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