Storage Manager

It serves as an interface between the data stored in the database and the application programs and queries submitted to the system.

It is responsible for:

  • interaction with the file manager (OS)

  • efficient storage, retrieval and updation of data

It has the following components:

  • Authorization/Integrity Manager: authenticates users and enforces integrity constraints

  • Transaction Manager: ensures atomicity of transactions

  • File Manager: keeps track of logical mapping between data and files

  • Buffer Manager: uses data buffering policies to speed up data access

It is responsible for storing data, data dictionary (that contains information about all the entities in the database) and indices.

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