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pages/总复习2023t1.md

@@ -1163,7 +1163,7 @@
 								  where Ramesh is present. If during the update we miss any single row,
 								  then there will be two addresses of Ramesh, which will lead to
 								  inconsistent and wrong databases.
-			- LATER Block 4
+			- DONE Block 4
 				- DONE Distributed DBMS
 					- DONE client server arch #flashcard
 					  id:: 648974ba-9c11-4816-9d5e-0623dc4d4d45
@@ -1286,7 +1286,19 @@
 							  3.  Partition Tolerance → A query must have an answer, even if the system
 							      is partitioned (unless there is a global failure).
 						- BASE: #flashcard
-							-
+							- **Basically Available:**
+							   Instead of making it compulsory for immediate consistency, 
+							  BASE-modelled NoSQL databases will ensure the availability of data by 
+							  spreading and replicating it across the nodes of the database cluster.
+							- **Soft State:**
+							   Due to the lack of immediate consistency, the data values may change 
+							  over time. The BASE model breaks off with the concept of a database that
+							   obligates its own consistency, delegating that responsibility to 
+							  developers.
+							- **Eventually Consistent**:
+							   The fact that BASE does not obligates immediate consistency but it does
+							   not mean that it never achieves it. However, until it does, the data 
+							  reads are still possible (even though they might not reflect reality).
 			- DONE Terms in: [chatGPT](https://chat.openai.com/c/db2ea8df-3bd0-4404-98ae-266afdd8fec1)
 		- LATER Exercises
 			- DONE past year exercise 1