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pages/总复习2023t1.md

@@ -1007,6 +1007,7 @@
 							- The instances of a potential subclass participate in a relationship unique to that subclass.
 					- DONE Designing databases
 						- Understand Database Design Methodology #flashcard
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 							- Conceptual database design
 								- The process of constructing a model of the data used in an enterprise, independent of all physical considerations.
 							- Logical database design
@@ -1014,6 +1015,7 @@
 							- Physical database design
 								- The process of producing a description of the implementation of the database (tailored to specific DBMS);
 						- general steps for Database Design Methodology. #flashcard
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 							- Gather requirements
 							- Conceptual database design
 							- Logical database design
@@ -1021,6 +1023,7 @@
 					- DONE SQL
 						- purpose and importance of SQL.
 							- SQL is a transform-oriented language with 2
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 							  collapsed:: true
 							  major components: #flashcard
 								- A DDL for defining database structure.
@@ -1142,6 +1145,7 @@
 						- Fifth Normal Form (5NF): 5NF is the highest level of normalization and involves decomposing a table into smaller tables to _remove data redundancy and improve data integrity._
 					- Anomaly
 						- Update Anomalies #flashcard
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 							- Insertion anomalies
 								- If there is a new row inserted in the table and it creates the
 								  inconsistency in the table then it is called the insertion anomaly. For
@@ -1191,6 +1195,7 @@
 						- Transaction Transparency: Ensures that all distributed transactions maintain distributed database’s integrity and consistency.
 						- Performance Transparency: must perform as if it were a centralized DBMS.
 					- DONE advantages and disadvantages of distributed databases #flashcard
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 						- Advantages
 							- Reflects organizational structure
 							- Improved shareability and local autonomy
@@ -1286,6 +1291,7 @@
 							  3.  Partition Tolerance → A query must have an answer, even if the system
 							      is partitioned (unless there is a global failure).
 						- BASE: #flashcard
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 							- **Basically Available:**
 							   Instead of making it compulsory for immediate consistency, 
 							  BASE-modelled NoSQL databases will ensure the availability of data by