Ecosyste.ms: Awesome
An open API service indexing awesome lists of open source software.
https://github.com/faisalsaifii/dbms
Database Management System Notes
https://github.com/faisalsaifii/dbms
dbms mysql
Last synced: 17 days ago
JSON representation
Database Management System Notes
- Host: GitHub
- URL: https://github.com/faisalsaifii/dbms
- Owner: faisalsaifii
- Created: 2022-12-15T06:09:22.000Z (about 2 years ago)
- Default Branch: master
- Last Pushed: 2022-12-15T10:36:04.000Z (about 2 years ago)
- Last Synced: 2024-11-05T21:17:47.870Z (2 months ago)
- Topics: dbms, mysql
- Homepage: https://faisalsaifii.github.io/DBMS/
- Size: 3.91 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# DataBase Management System
- [Unit 1 Introduction](./README.md/#unit-1-introduction)
- [Unit 2 Relational Data Model](./README.md#unit-2-relational-data-model)
- [Unit 3 Database Design and Normalisation](./README.md#unit-3-database-design-and-normalisation)
- [Unit 4 Transaction Processing Unit](./README.md#unit-4-transaction-processing-unit)
- [Unit 5 Concurrency Control Techniques](./README.md#unit-5-concurrency-control-techniques)
## Unit 1 Introduction
### What is DBMS?
- Software used to manage database
- Example, MySQL & Oracle (Commercial DB)
- Provides interface to perform operations like:
- Creation of Database
- Storage of Data
- Updation of Data
- Creation of table in Database
- Provides protection and security to DB
- Maintains data consistency (in case fo multiple users)
### Tasks Allowed using DBMS
1. **Data Definition:** Creation, modification, removal of DB objects
2. **Data Updation:**
3. **Data Retrieval:**
4. **User Administration:**
### Advantages of DBMS
1. **Database Redundancy:**
2. **Data Sharing:**
3. **Easy Maintenance:**
4. **Time Reduction**
5. **Backup**
6. **Multiple User Interface:**
### Disadvantages of DBMS
1. **Cost of h/w & s/w:**
2. **Size:**
3. **Complexity:**
4. **Higher impact of failure:**
### DB Users: Use and take benefits of DB
### Types of DB Users
1. **Application Programmers:**
2. **Sophisticated Users:**
3. **Specialized Users:**
4. **
### Super vs Candidate vs Primary Key
| Super Key | Candidate Key | Primary Key |
| --------- | ------------- | ----------- |
| Attribute | Minimal set of super key | Minimal set of attributes that uniquely identifies rows in a relation |
| Can be null | Can be null | Cannot be null |
### Generalisation
- Process of combination of 2 lower level entities to form higher level entity
- Bottom up approach
- Used to emphasise similarities among lower level entity sets & to hide the differences
### Specialization
### Aggregation
## Unit 2 Relational Data Model
### Relational Model
1. **Collection of Conceptual tool For describing data, data relationships, data semantics and consistency constraints.**
2. **Primary data model for commercial data processing applications.**
3. **uses collection of tables to represent both data and the relationships among those data.**
4. **Each table has multiple columns and each column has a unique name.**
## Unit 3 Database Design and Normalisation
## Unit 4 Transaction Processing Unit
## Unit 5 Concurrency Control Techniques
### Oracle
### SQL Plus
- Front end tools for Oracle
- Looks similar to DOS
- White background like Notepad
- Allows typing in our statements
### SQL Net
### SQL Loader