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Question 29/82
Your company runs end-of-the-month accounting reports. While the reports run, other financial records are updated in the database.
Users report that the reports take longer than expected to run.
You need to reduce the amount of time it takes for the reports to run. The reports must show committed data only.
What should you do?
Users report that the reports take longer than expected to run.
You need to reduce the amount of time it takes for the reports to run. The reports must show committed data only.
What should you do?
Correct Answer: E
Explanation/Reference:
Explanation:
Snapshot isolation enhances concurrency for OLTP applications.
Once snapshot isolation is enabled, updated row versions for each transaction are maintained in tempdb.
A unique transaction sequence number identifies each transaction, and these unique numbers are recorded for each row version. The transaction works with the most recent row versions having a sequence number before the sequence number of the transaction. Newer row versions created after the transaction has begun are ignored by the transaction.
References: https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/snapshot-isolation-in-sql- server
Explanation:
Snapshot isolation enhances concurrency for OLTP applications.
Once snapshot isolation is enabled, updated row versions for each transaction are maintained in tempdb.
A unique transaction sequence number identifies each transaction, and these unique numbers are recorded for each row version. The transaction works with the most recent row versions having a sequence number before the sequence number of the transaction. Newer row versions created after the transaction has begun are ignored by the transaction.
References: https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/snapshot-isolation-in-sql- server
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