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Following are the disadvantage of DBMS:

• Complexity
• Size
• Cost of DBMS
• Additional hardware costs
• Cost of conversion
• Performance
• Higher impact of a failure

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Following are the advantages of DBMS:

1. Control of data redundancy.
2. Data consistency
3. More information from the same amount of data.
4. Sharing of data.
5. Improved data integrity.
6. Improved security.
7. Enforcement of standards.
8. Economy of scale.
9. Balanced conflicting requirements
10. Improved data accessibility and responsiveness
11. Increased productivity
12. Improved maintenance through data independence
13. Increased concurrency
14. mproved backup and recovery services
    

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1. Access: Provide one application to access many databases
2. Layers: Hide physical storage considerations from the user
3. Views: To provide only the data a user needs
4. Security: Restrict access to the data
5. Integrity: Preserve data integrity while supporting change
6. Recovery: Return the database to a consistent state after a failure of any kind
7. Concurrency: Offer simultaneous access to many users
8. Backup
   

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Allows users to:

• Store data
• Manage change (updates)
• Organize data
• Retrieve data
• Retain privacy (security)
  

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A database management system is a software system that enables users to define, create, and maintain the database and which provides controlled access to this database.

• Provides systematic method of creating, updating, storing, and retrieving data in a database
• It enables end users and application programmers to share data among multiple applications
• A DBMS also provides facilities for controlling data access, enforcing data integrity, managing concurrency control, and restoring a database