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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Transaction Model ,[object Object],Write data to a file, a table, or otherwise WRITE Read data from a file, a table, or otherwise READ Kill the transaction and restore the old values ABORT_TRANSACTION Terminate the transaction and try to commit END_TRANSACTION Make the start of a transaction BEGIN_TRANSACTION Description Primitive
The Transaction Model ,[object Object],[object Object],BEGIN_TRANSACTION reserve WP -> JFK; reserve JFK -> Nairobi; reserve Nairobi -> Malindi full => ABORT_TRANSACTION (b) BEGIN_TRANSACTION reserve WP -> JFK; reserve JFK -> Nairobi; reserve Nairobi -> Malindi; END_TRANSACTION (a)
Distributed Transactions ,[object Object],[object Object]
Writeahead Log ,[object Object],[object Object],Log [x = 0 / 1] [y = 0/2] [x = 1/4] (d) Log [x = 0 / 1] [y = 0/2] (c) Log [x = 0 / 1] (b) x = 0; y = 0; BEGIN_TRANSACTION; x = x + 1; y = y + 2 x = y * y; END_TRANSACTION; (a)
Concurrency Control (1) ,[object Object]
Serializability ,[object Object],[object Object],(d) BEGIN_TRANSACTION x = 0; x = x + 3; END_TRANSACTION (c) BEGIN_TRANSACTION x = 0; x = x + 2; END_TRANSACTION (b) BEGIN_TRANSACTION x = 0; x = x + 1; END_TRANSACTION (a) Illegal x = 0; x = 0; x = x + 1; x = 0; x = x + 2; x = x + 3; Schedule 3 Legal x = 0; x = 0; x = x + 1; x = x + 2; x = 0; x = x + 3; Schedule 2 Legal x = 0; x = x + 1; x = 0; x = x + 2; x = 0; x = x + 3 Schedule 1
Two-Phase Locking (1) ,[object Object]
Two-Phase Locking (2) ,[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 

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