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Что (кто) такое Indexed Sequential Access Method - определение
FILE FORMAT
Indexed Sequential Access Method; Isam; Indexed sequential access method; Basic Indexed Sequential Access Method; Queued Indexed Sequential Access Method; Queued indexed sequential access method; Basic indexed sequential access method; QISAM; BISAM; BISAM (computing); Hierarchical Indexed Sequential Access Method; Hierarchical indexed sequential access method; HISAM (computing); HISAM
Найдено результатов: 3132
Indexed Sequential Access Method
<database> (ISAM) An IBM file management system allowing
records to be accessed either sequentially (in the order they
were entered) or via an index. Each index orders the records
on a different key.
ISAM was followed by VSAM (Virtual Storage Access Method)
and pre-dated relational databases.
(2003-07-13)
ISAM
ISAM (an acronym for indexed sequential access method) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved sequentially or randomly by one or more keys. Indexes of key fields are maintained to achieve fast retrieval of required file records in Indexed files.
HISAM
Hierarchical Indexed Sequential Acess Method (Reference: SAM)
ISAM
Index-Sequential Access Mode (Reference: DB, SAM)
Basic sequential access method
ACCESS METHOD TO READ AND WRITE DATASETS SEQUENTIALLY
Basic Sequential Access Method
In IBM mainframe operating systems, Basic sequential access method (BSAM) is an access method to read and write datasets sequentially. BSAM is available on OS/360, OS/VS2, MVS, z/OS, and related operating systems.
Sequential access
![Sequential access compared to [[random access]]](https://commons.wikimedia.org/wiki/Special:FilePath/Random vs sequential access.svg?width=200 "Sequential access compared to [[random access]]")
METHOD OF RETRIEVING AND PROCESSING INFORMATION IN THE ORDER STORED
Serial access; Sequential access method; Sequential read; Sequential write; Sequential I/O; Sequential memory access
Sequential access is a term describing a group of elements (such as data in a memory array or a disk file or on magnetic tape data storage) being accessed in a predetermined, ordered sequence. It is the opposite of random access, the ability to access an arbitrary element of a sequence as easily and efficiently as any other at any time.
multiple access
MEANS FOR MORE THAN TWO TERMINALS TO COMMUNICATE OVER ONE MEDIUM
Multiple access; Channel access; Multiple access method; Multiple-access protocol; Channel access methods; Multiple access protocols; Multiple access protocol; Power-division multiple access; Time and Frequency division multiple access
Virtual Storage Access Method
IBM DISK FILE STORAGE ACCESS METHOD
VSAM; Virtual Sequential Access Method; Virtual sequential access method; Virtual storage access method
<database> (VSAM) An IBM disk file storage scheme first used
in S/370 and virtual storage. VSAM comprises three access
methods: Keyed Sequenced Data Set (KSDS), {Relative Record
Data Set} (RRDS), and Entry Sequenced Data Set (ESDS).
Both IMS/DB and DB2 are implemented on top of VSAM and use
its underlying data structures.
["Storage" or "Sequential"? ]
(2002-07-26)
Channel access method
MEANS FOR MORE THAN TWO TERMINALS TO COMMUNICATE OVER ONE MEDIUM
Multiple access; Channel access; Multiple access method; Multiple-access protocol; Channel access methods; Multiple access protocols; Multiple access protocol; Power-division multiple access; Time and Frequency division multiple access
In telecommunications and computer networks, a channel access method or multiple access method allows more than two terminals connected to the same transmission medium to transmit over it and to share its capacity. Examples of shared physical media are wireless networks, bus networks, ring networks and point-to-point links operating in half-duplex mode.
Википедия
ISAM
ISAM (an acronym for indexed sequential access method) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved sequentially or randomly by one or more keys. Indexes of key fields are maintained to achieve fast retrieval of required file records in Indexed files. IBM originally developed ISAM for mainframe computers, but implementations are available for most computer systems.
The term ISAM is used for several related concepts:
- The IBM ISAM product and the algorithm it employs.
- A database system where an application developer directly uses an application programming interface to search indexes in order to locate records in data files. In contrast, a relational database uses a query optimizer which automatically selects indexes.
- An indexing algorithm that allows both sequential and keyed access to data. Most databases use some variation of the B-tree for this purpose, although the original IBM ISAM and VSAM implementations did not do so.
- Most generally, any index for a database. Indexes are used by almost all databases.
