Indexed sequential access method (ISAM)
ISAM method is an advanced sequential file organization. In this method, records are stored in the file using the primary key. An index value is generated for each primary key and mapped with the record. This index contains the address of the record in the file.
If any record has to be retrieved based on its index value, then the address of the data block is fetched and the record is retrieved from the memory.
Pros of ISAM:
Cons of ISAM