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Can we use transaction in select query?
2 Answers. In a highly concurrent application it could (theoretically) happen that data you’ve read in the first select is modified before the other selects are executed. If that is a situation that could occur in your application you should use a transaction to wrap your selects.
Does select need transaction?
You’re right: at the standard isolation level, read committed , you do not need to wrap select statements in transactions. Select statements will be protected from dirty reads whether you wrap them in a transaction or not.
Is transaction required for select query in hibernate?
(hibernate annotation docs) If the application is using optimistic locking, dirty reads are probably not that important, and there is no need to put the select in a transaction. When dirty reads are not acceptable, then a transaction for the select is appropriate.
Do we need a transaction for a single query statement?
If all you need to execute is a single SQL statement to corrrectly implement your application logic, then you do not need to explicitly place the SQL statement within a transaction. Your database engine should implictly create a transaction that contains only the single SQL statement your are executing.
How many types of transaction are there in hibernate?
There are four transactions in Hibernate ORM, and these are Atomicity, Consistency, Isolation, and Durability.
When to use transaction for read select statements?
However, you could use a transaction for READ select statements to: Make sure nobody else could update the table of interest while the bunch of your select query is executing. Have a look at this msdn post.
What happens if SELECT statement is inside explicit transaction?
If the single SELECT statement is inside an explicit transaction without altering the isolation levels, I’m pretty sure that will have no effect at all. Individual statements are, by themselves, transactions that are auto-committed or rolled back on error.
How are select statements used in SQL Server?
My procedure has three simple select queries, two of which use the returned value of the first. In a highly concurrent application it could (theoretically) happen that data you’ve read in the first select is modified before the other selects are executed.
When do you use transactions in SQL Server?
Transactions are usually used when you have CREATE, UPDATE or DELETE statements and you want to have the atomic behavior, that is, Either commit everything or commit nothing. Make sure nobody else could update the table of interest while the bunch of your select query is executing. Have a look at this msdn post.