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What is the biggest advantage of using transactions?
The primary benefit of using transactions is data integrity. Many database uses require storing data to multiple tables, or multiple rows to the same table in order to maintain a consistent data set. Using transactions ensures that other connections to the same database see either all the updates or none of them.
Are database transactions expensive?
So the conclusion is simple: transactions have no cost. Simply because there is no alternative to transactions.
How do you solve DB concurrency problems?
The general approach to handle a concurrency conflicts is:
- Catch DbUpdateConcurrencyException during SaveChanges .
- Use DbUpdateConcurrencyException.
- Refresh the original values of the concurrency token to reflect the current values in the database.
- Retry the process until no conflicts occur.
What does it mean when database is waiting?
Occurs during operations that change the state of a database, such as opening or closing a database. Occurs when a task is currently performing common language runtime (CLR) execution and is waiting for a particular autoevent to be initiated. Long waits are typical, and do not indicate a problem.
Why does SQL Server have a wait time counter?
This is because such a thread is first put on the queue of runnable workers and must wait for a quantum to run on the scheduler. In SQL Server the wait-time counters are bigint values and therefore are not as prone to counter rollover as the equivalent counters in earlier versions of SQL Server.
Why are there external waits in SQL Server?
External waits occur when a SQL Server worker is waiting for an external event, such as an extended stored procedure call or a linked server query, to finish. When you diagnose blocking issues, remember that external waits do not always imply that the worker is idle, because the worker may actively be running some external code.
When is a SQL Server worker thread not considered to be waiting?
Counters are reset to zero any time the database is moved or taken offline. A SQL Server worker thread is not considered to be waiting if any of the following is true: A resource becomes available. A queue is nonempty. An external process finishes.