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Database Systems/Notes.md
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@@ -14,7 +14,7 @@ my server crashed towards the end of the year, so most of the images are gone. I
- Database Management Systems (DBMS) - a software tool for storing/managing large amounts of data
- Database Server - a specific installation of a DBMS
- Database - a collection of data (often in a DBMS) organized for a specific application (also see [Database Section](https://cloud.ion606.com/apps/files/files#h-databases))
- Database - a collection of data (often in a DBMS) organized for a specific application (also see [Database Section](https://github.com/ION606/learn/blob/main/Database%20Systems/Notes.md#databases))
- Database Application - a software product that uses DBMSs to store one or more databases for a specific purpose
- Database Schema
- what types of data are valid to store
@@ -31,8 +31,8 @@ my server crashed towards the end of the year, so most of the images are gone. I
- rules about the data (Database Schema)
- design so that you hopefully never have to make changes, cause making changes later on is difficult
- Transaction - a program that changes data or a sequence of database operations that satisfies the ACID properties (which can be perceived as a single logical operation on the data)
- ACID - see [ACID Section](https://cloud.ion606.com/apps/files/files/34361?dir=/School/Senior%20Year/Datbase%20Systems&openfile=true#h-a-c-i-d)
- Relational Data Model - see [Relational Data Model](https://cloud.ion606.com/apps/files/files/34361?dir=/School/Senior%20Year/Datbase%20Systems&openfile=true#h-relational-data-model) section
- ACID - see [ACID Section](https://github.com/ION606/learn/blob/main/Database%20Systems/Notes.md#boyce-codd-normal-form-bcnf)
- Relational Data Model - see [Relational Data Model](https://github.com/ION606/learn/blob/main/Database%20Systems/Notes.md#relational-data-model) section
- Key - some attribute that determines other keys, you can have multiple keys
- minimal key - the minimum set of attributes needed to get the correct info
- super key - any superset containing the minimal key (any superset of the minimal key)
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- Database Schema + Database Instance + Application Logic
- Relational Data Model
- set of relations
- BCNF - see [BCNF](https://cloud.ion606.com/apps/files/files/34361?dir=/School/Senior%20Year/Datbase%20Systems&openfile=true#h-boyce-codd-normal-form-bcnf) section
- Entity-Relationship Models - See [ER](https://cloud.ion606.com/apps/files/files/34361?dir=/School/Senior%20Year/Datbase%20Systems&openfile=true#h-entity-relationship-models-er) section
- BCNF - see [BCNF](https://github.com/ION606/learn/blob/main/Database%20Systems/Notes.md#boyce-codd-normal-form-bcnf) section
- Entity-Relationship Models - See [ER](https://github.com/ION606/learn/blob/main/Database%20Systems/Notes.md#entity-relationship-er-models) section
### What Makes a DBMS
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## Query Processing
- SQL queries are converted to bag relational algebra queries to be implemented
Overall picture of the DBMS system components
![[Pasted image 20241201144514.png]]
MOVE TO NEXTCLOUD????
#### Disk Access Process (Overly Simplified)
- to process any data, it must first be brought to memory