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108
second/semester1/logseq-stuff/logseq/bak/pages/Database System Introduction/2022-10-10T11_59_52.373Z.Desktop.md Normal file
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- #[[CT230 - Database Systems I]]
- No previous topic
- **Next Topic:** [[The Relational Model]]
- **Relevant Slides:** ![Lecture01.pdf](../assets/Lecture01_1662845512365_0.pdf)
-
- What is a **database**? #card
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card-repeats:: 3
card-ease-factor:: 2.56
card-next-schedule:: 2022-10-10T17:12:15.766Z
card-last-reviewed:: 2022-09-30T12:12:15.767Z
card-last-score:: 3
- A **database** is ^^a collection of related data.^^
-
- What is the **Database Approach**? #card
card-last-interval:: 4
card-repeats:: 2
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T10:35:42.411Z
card-last-reviewed:: 2022-10-07T10:35:42.412Z
card-last-score:: 3
- A **single repository** of data (which may be distributed) is maintained that is **defined once** and then accessed by various users via a **DBMS**.
- ## Database Management Systems
- What is a **DBMS**? #card
card-last-interval:: 8.32
card-repeats:: 3
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T18:42:02.196Z
card-last-reviewed:: 2022-10-03T11:42:02.196Z
card-last-score:: 3
- The **DataBase Management System (DBMS)** is a collection of programs that facilitates the process of ^^defining, constructing, & manipulating^^ databases for various applications.
- ### DBMS Capabilities #card
card-last-interval:: 9.28
card-repeats:: 3
card-ease-factor:: 2.32
card-next-schedule:: 2022-10-12T20:27:57.126Z
card-last-reviewed:: 2022-10-03T14:27:57.127Z
card-last-score:: 3
- 1. **Define** database (DDL)
2. **Manipulate** database (SQL)
3. **Control** redundancy
4. **Restrict** unauthorised access
5. **Enforce** integrity constraints
6. Provide multiple user interfaces / **views**
7. Provide **concurrent access**
8. Provide mechanism for **recovery**
9. Provide **back-up**
10. Allows representation of complex relationships between data (For efficiency & optimisation reasons)
-
- ### Disadvantages of DBMS approach #card
card-last-interval:: 10.24
card-repeats:: 3
card-ease-factor:: 2.56
card-next-schedule:: 2022-10-11T18:17:45.706Z
card-last-reviewed:: 2022-10-01T13:17:45.707Z
card-last-score:: 5
- Strict schema & multiple tables / relations
- Complexity
- Size
- Cost of DBMS
- Additional hardware costs
- Cost of conversion
- Performance
- Higher impact of failure
- ### DBMS Users #card
card-last-interval:: 4
card-repeats:: 2
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T10:38:38.838Z
card-last-reviewed:: 2022-10-07T10:38:38.839Z
card-last-score:: 3
- **Administrators (DBA)** - accounts, passwords, privileges. Requiring constant vigilance
- **System Analysts** - "What's required to solve a problem? What does the business need?"
- **Designers** - ER diagrams, mapping ER diagrams to tables
- **Application Programmers** - creating tables, adding data, creating queries
- **End users**
-
- What is **Database Abstraction**? #card
card-last-interval:: 9.28
card-repeats:: 3
card-ease-factor:: 2.32
card-next-schedule:: 2022-10-10T19:18:04.573Z
card-last-reviewed:: 2022-10-01T13:18:04.573Z
card-last-score:: 3
- **Database Abstraction** refers to the hiding of the details of data storage that are not needed by most database users.
- The aim is to separate user's views of the database from the way that it is "physically" represented.
- 3 ways in which data can be described:
- **External:** user's view
- **Conceptual:** logical structure as seen by DBA
- **Internal:** DBMS and OS view of data
- What is the database **schema**? #card
card-last-interval:: 9.28
card-repeats:: 3
card-ease-factor:: 2.32
card-next-schedule:: 2022-10-09T18:10:33.547Z
card-last-reviewed:: 2022-09-30T12:10:33.548Z
card-last-score:: 3
- The database **schema** is the ^^logical structure of the database.^^
- What is the database **instance**? #card
card-last-interval:: 11.2
card-repeats:: 3
card-ease-factor:: 2.8
card-next-schedule:: 2022-10-14T18:29:01.333Z
card-last-reviewed:: 2022-10-03T14:29:01.333Z
card-last-score:: 5
- The database **instance** is ^^the actual content of the database at some point in time.^^
-
-

108
second/semester1/logseq-stuff/logseq/bak/pages/Database System Introduction/2022-10-20T09_05_57.932Z.Desktop.md Normal file
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@ -0,0 +1,108 @@
- #[[CT230 - Database Systems I]]
- No previous topic
- **Next Topic:** [[The Relational Model]]
- **Relevant Slides:** ![Lecture01.pdf](../assets/Lecture01_1662845512365_0.pdf)
-
- What is a **database**? #card
card-last-interval:: 10.24
card-repeats:: 3
card-ease-factor:: 2.56
card-next-schedule:: 2022-10-10T17:12:15.766Z
card-last-reviewed:: 2022-09-30T12:12:15.767Z
card-last-score:: 3
- A **database** is ^^a collection of related data.^^
-
- What is the **Database Approach**? #card
card-last-interval:: 4
card-repeats:: 2
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T10:35:42.411Z
card-last-reviewed:: 2022-10-07T10:35:42.412Z
card-last-score:: 3
- A **single repository** of data (which may be distributed) is maintained that is **defined once** and then accessed by various users via a **DBMS**.
- ## Database Management Systems
- What is a **DBMS**? #card
card-last-interval:: 8.32
card-repeats:: 3
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T18:42:02.196Z
card-last-reviewed:: 2022-10-03T11:42:02.196Z
card-last-score:: 3
- The **DataBase Management System (DBMS)** is a collection of programs that facilitates the process of ^^defining, constructing, & manipulating^^ databases for various applications.
- ### DBMS Capabilities #card
card-last-interval:: 9.28
card-repeats:: 3
card-ease-factor:: 2.32
card-next-schedule:: 2022-10-12T20:27:57.126Z
card-last-reviewed:: 2022-10-03T14:27:57.127Z
card-last-score:: 3
- 1. **Define** database (DDL)
2. **Manipulate** database (SQL)
3. **Control** redundancy
4. **Restrict** unauthorised access
5. **Enforce** integrity constraints
6. Provide multiple user interfaces / **views**
7. Provide **concurrent access**
8. Provide mechanism for **recovery**
9. Provide **back-up**
10. Allows representation of complex relationships between data (For efficiency & optimisation reasons)
-
- ### Disadvantages of DBMS approach #card
card-last-interval:: 10.24
card-repeats:: 3
card-ease-factor:: 2.56
card-next-schedule:: 2022-10-11T18:17:45.706Z
card-last-reviewed:: 2022-10-01T13:17:45.707Z
card-last-score:: 5
- Strict schema & multiple tables / relations
- Complexity
- Size
- Cost of DBMS
- Additional hardware costs
- Cost of conversion
- Performance
- Higher impact of failure
- ### DBMS Users #card
card-last-interval:: 4
card-repeats:: 2
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T10:38:38.838Z
card-last-reviewed:: 2022-10-07T10:38:38.839Z
card-last-score:: 3
- **Administrators (DBA)** - accounts, passwords, privileges. Requiring constant vigilance
- **System Analysts** - "What's required to solve a problem? What does the business need?"
- **Designers** - ER diagrams, mapping ER diagrams to tables
- **Application Programmers** - creating tables, adding data, creating queries
- **End users**
-
- What is **Database Abstraction**? #card
card-last-interval:: 9.28
card-repeats:: 3
card-ease-factor:: 2.32
card-next-schedule:: 2022-10-10T19:18:04.573Z
card-last-reviewed:: 2022-10-01T13:18:04.573Z
card-last-score:: 3
- **Database Abstraction** refers to the hiding of the details of data storage that are not needed by most database users.
- The aim is to separate user's views of the database from the way that it is "physically" represented.
- 3 ways in which data can be described:
- **External:** user's view
- **Conceptual:** logical structure as seen by DBA
- **Internal:** DBMS and OS view of data
- What is the database **schema**? #card
card-last-interval:: 23.43
card-repeats:: 4
card-ease-factor:: 2.42
card-next-schedule:: 2022-11-02T21:44:54.610Z
card-last-reviewed:: 2022-10-10T11:44:54.610Z
card-last-score:: 5
- The database **schema** is the ^^logical structure of the database.^^
- What is the database **instance**? #card
card-last-interval:: 11.2
card-repeats:: 3
card-ease-factor:: 2.8
card-next-schedule:: 2022-10-14T18:29:01.333Z
card-last-reviewed:: 2022-10-03T14:29:01.333Z
card-last-score:: 5
- The database **instance** is ^^the actual content of the database at some point in time.^^
-
-

108
second/semester1/logseq-stuff/logseq/bak/pages/Database System Introduction/2022-11-09T13_03_58.102Z.Desktop.md Normal file
View File

@ -0,0 +1,108 @@
- #[[CT230 - Database Systems I]]
- No previous topic
- **Next Topic:** [[The Relational Model]]
- **Relevant Slides:** ![Lecture01.pdf](../assets/Lecture01_1662845512365_0.pdf)
-
- What is a **database**? #card
card-last-interval:: 23.43
card-repeats:: 4
card-ease-factor:: 2.42
card-next-schedule:: 2022-11-12T18:33:52.240Z
card-last-reviewed:: 2022-10-20T08:33:52.241Z
card-last-score:: 3
- A **database** is ^^a collection of related data.^^
-
- What is the **Database Approach**? #card
card-last-interval:: 4
card-repeats:: 2
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T10:35:42.411Z
card-last-reviewed:: 2022-10-07T10:35:42.412Z
card-last-score:: 3
- A **single repository** of data (which may be distributed) is maintained that is **defined once** and then accessed by various users via a **DBMS**.
- ## Database Management Systems
- What is a **DBMS**? #card
card-last-interval:: 8.32
card-repeats:: 3
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T18:42:02.196Z
card-last-reviewed:: 2022-10-03T11:42:02.196Z
card-last-score:: 3
- The **DataBase Management System (DBMS)** is a collection of programs that facilitates the process of ^^defining, constructing, & manipulating^^ databases for various applications.
- ### DBMS Capabilities #card
card-last-interval:: 9.28
card-repeats:: 3
card-ease-factor:: 2.32
card-next-schedule:: 2022-10-12T20:27:57.126Z
card-last-reviewed:: 2022-10-03T14:27:57.127Z
card-last-score:: 3
- 1. **Define** database (DDL)
2. **Manipulate** database (SQL)
3. **Control** redundancy
4. **Restrict** unauthorised access
5. **Enforce** integrity constraints
6. Provide multiple user interfaces / **views**
7. Provide **concurrent access**
8. Provide mechanism for **recovery**
9. Provide **back-up**
10. Allows representation of complex relationships between data (For efficiency & optimisation reasons)
-
- ### Disadvantages of DBMS approach #card
card-last-interval:: 10.24
card-repeats:: 3
card-ease-factor:: 2.56
card-next-schedule:: 2022-10-11T18:17:45.706Z
card-last-reviewed:: 2022-10-01T13:17:45.707Z
card-last-score:: 5
- Strict schema & multiple tables / relations
- Complexity
- Size
- Cost of DBMS
- Additional hardware costs
- Cost of conversion
- Performance
- Higher impact of failure
- ### DBMS Users #card
card-last-interval:: 4
card-repeats:: 2
card-ease-factor:: 2.08
card-next-schedule:: 2022-10-11T10:38:38.838Z
card-last-reviewed:: 2022-10-07T10:38:38.839Z
card-last-score:: 3
- **Administrators (DBA)** - accounts, passwords, privileges. Requiring constant vigilance
- **System Analysts** - "What's required to solve a problem? What does the business need?"
- **Designers** - ER diagrams, mapping ER diagrams to tables
- **Application Programmers** - creating tables, adding data, creating queries
- **End users**
-
- What is **Database Abstraction**? #card
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card-repeats:: 4
card-ease-factor:: 2.18
card-next-schedule:: 2022-11-08T08:37:10.629Z
card-last-reviewed:: 2022-10-20T08:37:10.629Z
card-last-score:: 3
- **Database Abstraction** refers to the hiding of the details of data storage that are not needed by most database users.
- The aim is to separate user's views of the database from the way that it is "physically" represented.
- 3 ways in which data can be described:
- **External:** user's view
- **Conceptual:** logical structure as seen by DBA
- **Internal:** DBMS and OS view of data
- What is the database **schema**? #card
card-last-interval:: 23.43
card-repeats:: 4
card-ease-factor:: 2.42
card-next-schedule:: 2022-11-02T21:44:54.610Z
card-last-reviewed:: 2022-10-10T11:44:54.610Z
card-last-score:: 5
- The database **schema** is the ^^logical structure of the database.^^
- What is the database **instance**? #card
card-last-interval:: 11.2
card-repeats:: 3
card-ease-factor:: 2.8
card-next-schedule:: 2022-10-14T18:29:01.333Z
card-last-reviewed:: 2022-10-03T14:29:01.333Z
card-last-score:: 5
- The database **instance** is ^^the actual content of the database at some point in time.^^
-
-