From 8af62810b69d5a6374efbed4a95685302f98d4aa Mon Sep 17 00:00:00 2001 From: Ryan Date: Wed, 14 Jun 2023 16:12:54 +0800 Subject: [PATCH] Auto saved by Logseq --- pages/总复习2023t1.md | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md index 3fd3bdb..51ba6df 100644 --- a/pages/总复习2023t1.md +++ b/pages/总复习2023t1.md @@ -959,7 +959,7 @@ - LATER review lab2 - LATER SQL join - LATER Block 2 - - LATER EER + - DONE EER - Most useful additional concept of EER model: specialization/generalization. - Specialization @@ -1007,11 +1007,11 @@ - DONE Block 3 - DONE DB transaction management - anomalies - - DONE ACID (Atomicity, Consistency, Isolation, Durability): A set of properties that guarantee the reliability and integrity of database transactions. - - Atomicity: The property that ensures a transaction is treated as a single, indivisible unit of work. It either executes all its operations successfully or rolls back to the initial state if any operation fails. - - Consistency: The property that ensures a transaction transforms the database from one consistent state to another consistent state. It maintains data integrity and adheres to defined business rules. - - Isolation: The property that ensures concurrent transactions do not interfere with each other. Each transaction operates in isolation until it completes, preventing interference or conflicts. - - Durability: The property that ensures committed changes made by a transaction are permanently saved and will survive any subsequent system failures or crashes. + - DONE ACID (Atomicity, Consistency, Isolation, Durability): A set of properties that guarantee the reliability and integrity of database transactions. #flashcard + - Atomicity: :-> The property that ensures a transaction is treated as a single, indivisible unit of work. It either executes all its operations successfully or rolls back to the initial state if any operation fails. + - Consistency: :-> The property that ensures a transaction transforms the database from one consistent state to another consistent state. It maintains data integrity and adheres to defined business rules. + - Isolation: :-> The property that ensures concurrent transactions do not interfere with each other. Each transaction operates in isolation until it completes, preventing interference or conflicts. + - Durability: :-> The property that ensures committed changes made by a transaction are permanently saved and will survive any subsequent system failures or crashes. - DONE Concurrency control - DONE Meaning of serialisability. - DONE How locking can ensure serialisability.