ADABASE the adaptable database, is a high-performance,

multithreaded, database management system for mainframe

platforms where database performance is a critical factor.

It is built on INVERTED LIST model.

Inverted List: it is used to resolve Adabas search commands

and read records in logical sequence, is built and

maintained for each field in an Adabas file that is

designated as a key field or “descriptor”.t is called

an “inverted” list because it is organized by descriptor

value rather than by ISN.

ADDRESS CONVERTOR:it contains the RABN's in ISN order. It

determines the physical location of a record. It is an

index that maps the logical identifier of a record (that

is, the ISN) to the relative Adabas block number (RABN) of

the Data Storage block where the record is stored.

DATA Storage:It stores the actual record in the order in

which it was entered