MySQL + SQL · Lesson 1
File Processing Vs Dbms
What is a File Processing System?
A file processing system stores data in separate files managed by application programs. Each program has its own files and format. A DBMS stores all data centrally and manages it through one software layer.
File System vs DBMS
| Point | File System | DBMS |
|---|---|---|
| Redundancy | High — same data in many files | Controlled |
| Consistency | Hard to maintain | Maintained automatically |
| Data sharing | Difficult | Easy, multi-user |
| Security | File-level only | User & row level |
| Query | Manual coding | Simple SQL |
| Backup/Recovery | Manual | Built-in |
School Example
In a file system the fee clerk's file and the library file both store the student name. Change a name in one, and the other becomes wrong. A DBMS keeps the name once and links it with keys — change it once, correct everywhere.
Common Mistakes
- Thinking Excel = DBMS. Excel is a file system, not a managed database.
- Forgetting that file systems cause data inconsistency, the main exam point.
Summary
- File systems keep data in unconnected files; DBMS centralizes it.
- DBMS reduces redundancy, improves consistency, sharing, security and querying.
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