What is database isolation in SQL Server?Database isolation comes into play when we need to isolate the database and protect it from other things on the network. This protection is achieved using locks. The type of lock and the level of isolation level needed is referred as isolation level in SQL Server.
Types of isolation levels:
READ COMMITTED: Shared locks are held while any data is being read.
READ UNCOMMITTED: Specifies isolation level 0 locking. There are thus no shared locks or exclusive locks. Lease restrictive of all the isolation levels.
REPEATABLE READ: Locks are applied on all data being used by a query. However, new phantom rows can be inserted into the data set by another user and are included in later reads within the current transaction.
SERIALIZABLE: Issues a range lock on data set, preventing other users to update or insert data into dataset until the transaction is complete.
What is database isolation in SQL Server? Isolation in database defines how and when changes made by one transaction can be visible to other transactions.
Different isolation levels are:
- Repeatable read
- Read committed
- Read uncommitted