A transaction is a unit of work that you want to treat as "a whole." It has to either happen in full or not at all. A classical example is transferring money from one bank account to another. To do that you have first to withdraw the amount from the source account, and then deposit it to the destination account. The operation has to succeed in full. If you stop halfway, the money will be lost ...
I understand how a transaction might be useful for co-ordinating a pair of updates. What I don't understand is wrapping single statements in transactions, which is 90% of what I've ever seen. In ...
I don't know how to say it any clearer. If you need the set to fail or succeed as a whole then wrap it in a transaction. The classic example is transfer of money from a checking to a savings account - if the deposit fails then I want the withdrawal to fail. If data out of synch because of a developer mistake is OK then don't use transactions.
The three key operations on a transactions are: BEGIN TRANSACTION: Tell the database that a transaction is beginning. All changes within the transaction are invisible to other users while the transaction is "active". COMMIT TRANSACTION: Make all the changes visible in the database. Conceptually, this happens instantaneously.
Do u think there is a better way to write a transaction in t-sql? Is there a better approach that improves maintainability and performance of the application that uses this transaction? -- Descri...
I think the best way to understand the difference between Transactional and Non-Transactional Data is through examples Non -Transactional (These information are relevant to enterprise for longer duration than Transactional Data.) Customer: Name, Preferences Product: Name, Hierarchy Site/Location: Addresses Account: Contracts Detail Transactional (Has a Time Dimension, and becomes historical ...
Participating transaction failed - marking existing transaction as rollback-only So I just stepped through my code to see where this line is generated and found that there is a catch block which did not throw anything.
Add a try/catch block, if the transaction succeeds it will commit the changes, if the transaction fails the transaction is rolled back: