Auto saved by Logseq

pages/总复习2023t1.md

@@ -1066,7 +1066,7 @@
 							  transactions active at time of crash.
 				- DONE Normalization
 				  background-color:: yellow
-					- DONE Functional dependencies [g4g](https://www.geeksforgeeks.org/types-of-functional-dependencies-in-dbms/)
+					- DONE Functional dependencies [g4g](https://www.geeksforgeeks.org/types-of-functional-dependencies-in-dbms/) #flashcard
 						- In a relational database management, functional dependency is a concept
 						  that specifies the relationship between two sets of attributes where one
 						  attribute determines the value of another attribute. It is denoted as **X → Y**, where the attribute set on the left side of the arrow, **X** is called **Determinant** , and **Y** is called the **Dependent**.
@@ -1075,29 +1075,29 @@
 					  CLOCK: [2023-06-01 Thu 17:38:55]--[2023-06-01 Thu 17:38:56] => 00:00:01
 					  :END:
 					- DONE kinds of NF [tutorial](https://www.geeksforgeeks.org/normal-forms-in-dbms/)
-						- First Normal Form (1NF): This is the most basic level of
+						- First Normal Form (1NF): :-> This is the most basic level of
 						  normalization. In 1NF, each table cell should contain _only a single value, and each column should have a unique name_. The first normal form helps to eliminate duplicate data and simplify queries.
-						- Second Normal Form (2NF): 2NF eliminates redundant data by requiring that each _non-key attribute_ be dependent on the primary key. This means that _each column should be directly related to the primary key_, and not to other
+						- Second Normal Form (2NF): :->  2NF eliminates redundant data by requiring that each _non-key attribute_ be dependent on the primary key. This means that _each column should be directly related to the primary key_, and not to other
 						  columns.
-						- Third Normal Form (3NF): 3NF builds on 2NF by requiring
+						- Third Normal Form (3NF): :->  3NF builds on 2NF by requiring
 						  that _all non-key attributes are independent of each other._ This means that each column should be directly related to the primary key, and not to any other columns in the same table.
-						- Boyce-Codd Normal Form (BCNF): BCNF is a stricter form of 3NF that ensures that each determinant in a table is a candidate key. In other words, BCNF ensures that _each non-key attribute is dependent only on the candidate key._
+						- Boyce-Codd Normal Form (BCNF): :->  BCNF is a stricter form of 3NF that ensures that each determinant in a table is a candidate key. In other words, BCNF ensures that _each non-key attribute is dependent only on the candidate key._
 						- Fourth Normal Form (4NF): 4NF is a further refinement of BCNF that ensures that _a table does not contain any multi-valued dependencies._
 						- 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._
 			- LATER Block 4
 				- DONE Distributed DBMS
-					- DONE client server arch
+					- DONE client server arch #flashcard
 						- Computers (client) connected over wired or wireless local area network (LAN)
 						- The database itself and the DBMS are stored on a central device called the database server, which is also connected to the network.
-					- Distributed Database
+					- Distributed Database #flashcard
 						- A logically interrelated collection of shared data (and a description of this data), physically spread over a computer network.
-					- Distributed DBMS
+					- Distributed DBMS #flashcard
 						- Software system that permits the management of the distributed database and makes the distribution transparent to users.
-					- the key issues
+					- the key issues #flashcard
 						- Fragmentation
 						- Allocation
 						- Replication
-					- importance and different types of fragmentation
+					- importance and different types of fragmentation #flashcard
 						- Horizontal
 						- Vertical
 						- Mixed