Write a short note on Indexed Sequential Access Method.

1.	Write a short note on Indexed Sequential Access Method.
Answer» Indexed Sequential Access Method (ISAM): This method combines both the feature of sequential and random organization. Records are accessed by using an index or a table. The index stores the address of each record corresponding to a key number of the record. The records within the file are stored sequentially but directly accessed to individual records. An indexed sequential access method (ISAM) consists of The main file storage A table to maintain the index Advantages: It combines both sequential and direct Suitable for sequential access and random access Provides quick access to records Disadvantage: it uses special software and is expensive extra time is taken to maintain index extra storage for index files expensive hardware is required

Answer»

Indexed Sequential Access Method (ISAM):

This method combines both the feature of sequential and random organization. Records are accessed by using an index or a table. The index stores the address of each record corresponding to a key number of the record.

The records within the file are stored sequentially but directly accessed to individual records.
An indexed sequential access method (ISAM) consists of

The main file storage
A table to maintain the index

Advantages:

It combines both sequential and direct
Suitable for sequential access and random access
Provides quick access to records

Disadvantage:

it uses special software and is expensive
extra time is taken to maintain index
extra storage for index files
expensive hardware is required

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Write a short note on Indexed Sequential Access Method.

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