Сделана 10 лаба

Lab10/Task1.sql

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+/*
+Starts a transaction to read the record of 
+Linda Gonzales and update her first name. 
+Second select shows the uncommitted update. 
+@@trancount shows the number of open transactions.
+*/
+
+USE AdventureWorks
+
+-- START TRANSACTION HERE
+BEGIN TRANSACTION
+  SELECT @@trancount AS 'Transaction Count'
+  SELECT FirstName, MiddleName, LastName FROM Person.Contact WHERE ContactID = 342
+  UPDATE Person.Contact SET FirstName = 'Lin' WHERE ContactID = 342
+-- END TRANSACTION HERE
+COMMIT TRANSACTION
+
+SELECT FirstName, MiddleName, LastName FROM Person.Contact WHERE ContactID = 342
+SELECT @@trancount AS 'Transaction Count'

Lab10/Task2.sql

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+/*
+Starts a transaction to read the record of 
+Dominic Gonzalez and update his first name. 
+Second SELECT shows the uncommitted update.
+@@trancount showS the number of open transactions.
+Then the transaction is rolled back and the record read again.
+*/
+
+USE AdventureWorks
+
+BEGIN TRANSACTION
+  SELECT @@trancount AS 'Transaction Count'
+  SELECT FirstName, MiddleName, LastName FROM Person.Contact WHERE ContactID = 7454
+  UPDATE Person.Contact SET FirstName = 'Dom' WHERE ContactID = 7454
+  SELECT FirstName, MiddleName, LastName FROM Person.Contact WHERE ContactID = 7454
+  SELECT @@trancount AS 'Transaction Count'
+-- END TRANSACTION HERE
+ROLLBACK TRANSACTION
+
+  SELECT FirstName, MiddleName, LastName FROM Person.Contact WHERE ContactID = 7454
+  SELECT @@trancount AS 'Transaction Count'

Lab10/Task3.sql

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+SELECT resource_type, request_mode, request_type, request_status,
+request_session_id
+FROM sys.dm_tran_locks
+
+/*
+Update a record in the Person.Contact table in the AdventureWorks database.
+*/
+
+USE AdventureWorks
+
+BEGIN TRANSACTION
+  UPDATE Person.Contact
+    SET FirstName = 'Fran'
+    WHERE ContactID = 6
+-- For the purpose of the exercise, COMMIT TRANASACTION or ROLLBACK TRANSACTION are not used.
+
+SELECT @@spid AS 'spid'
+-- Use the SPID to identify the connection when using sys.dm_tran_locks.
+
+ROLLBACK TRANSACTION

Lab10/Task4.sql

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+/*
+Read and update a record in the Person.Contact table in the AdventureWorks database.
+*/
+
+USE AdventureWorks
+
+SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
+
+SET lock_timeout 5000
+
+BEGIN TRANSACTION
+  SELECT * FROM Person.Contact WHERE ContactID = 10
+  UPDATE Person.Contact SET FirstName = 'Frances' WHERE ContactID = 6
+-- For the purpose of the exercise, COMMIT TRANSACTION or ROLLBACK TRANSACTION are not used.
+
+SELECT @@spid AS 'SPID'
+-- Use the SPID to identify the connection when using sp_lock.
+
+-- ROLLBACK TRANSACTION

Lab10/Task4_1.sql

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+SELECT resource_type, request_mode,request_type, request_status, request_session_id
+FROM sys.dm_tran_locks