What does ISAM stand for?

What does ISAM mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: ISAM.

We've found a total of 15 definitions for ISAM:

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ISAM

Indexed Sequential Access Method

Computing » General

   
ISAM

Indexed Sequential Access Methods

Miscellaneous » Unclassified

   
ISAM

Information Security Awareness Month

Computing » Security

   
ISAM

Information Security Awareness Month

Governmental » US Government

   
ISAM

Information Security Awareness Month

Governmental » Military

   
ISAM

Information Security Awareness Month

Governmental » NASA

   
ISAM

Inline Sequential Access Method

Miscellaneous » Unclassified

   
ISAM

Internet Server Application Module

Computing » Software

   
ISAM

Index Storage Access Method

Miscellaneous » Unclassified

   
ISAM

A Ibms Standard Access Method

Miscellaneous » Unclassified

   
ISAM

Improvement Of Safety Assessment Methodologies

Miscellaneous » Unclassified

   
ISAM

Ionic Self Assembled Monolayers

Miscellaneous » Unclassified

   
ISAM

Innovationsionic Self Assembled Monolayers

Miscellaneous » Unclassified

   
ISAM

Ilms Self Assembled Monolayer

Miscellaneous » Unclassified

   
ISAM

International Symposium on Advanced Materials

Community » Conferences

   

What does ISAM mean?

ISAM
ISAM stands for Indexed Sequential Access Method, a method for indexing data for fast retrieval. ISAM was originally developed by IBM for mainframe computers. Today the term is used for several related concepts: Specifically, 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 now 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, both relational and otherwise. In an ISAM system, data is organized into records which are composed of fixed length fields. Records are stored sequentially, originally to speed access on a tape system. A secondary set of hash tables known as indexes contain "pointers" into the tables, allowing individual records to be retrieved without having to search the entire data set. This is a departure from the contemporaneous navigational databases, in which the pointers to other data were stored inside the records themselves. The key improvement in ISAM is that the indexes are small and can be searched quickly, thereby allowing the database to access only the records it needs. Additionally modifications to the data do not require changes to other data, only the table and indexes in question.

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