diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index a01046f..2070881 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -1005,9 +1005,9 @@
 							- The instances of a potential subclass participate in a relationship unique to that subclass.
 			- DONE Block 3
 				- DONE DB transaction management
-					- NOW anomalies
+					- DONE anomalies
 					  :LOGBOOK:
-					  CLOCK: [2023-06-14 Wed 16:41:52]
+					  CLOCK: [2023-06-14 Wed 16:41:52]--[2023-06-14 Wed 16:49:14] =>  00:07:22
 					  :END:
 						- DONE Deadlock and how it can be resolved. #flashcard
 							- A deadlock is a situation in which two or more transactions are unable
@@ -1015,6 +1015,7 @@
 							  resulting in a circular dependency and a system halt. It is a form of
 							  resource contention that can occur in concurrent systems, including
 							  database management systems.
+						- Cascading rollback #flashcard
 					- DONE ACID (Atomicity, Consistency, Isolation, Durability): A set of properties that guarantee the reliability and integrity of database transactions. #flashcard
 					  collapsed:: true
 						- 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.
@@ -1022,7 +1023,7 @@
 						- 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
-						- LATER Meaning of serialisability.
+						- DONE Meaning of serialisability. #flashcard
 							- The objective of serialisability is to find nonserial schedules that are equivalent to some serial schedule. Such a schedule is called serialisable.
 						- DONE How locking can ensure serialisability. #flashcard
 							- Locking achieves serializability by using locks to control access to