Question 11 :
READ COMMITTED is the default isolation level.
Question 12 :
A differential backup makes a copy of the entire database.
Question 13 :
SQL Server supports three recovery modes: simple, full and Bulk.
SQL Server provides three different recovery models that allow you to specify the way SQL Server manages log files and prepares your enterprise for a disaster. Each of these models represents a different approach to balancing the tradeoff between conserving disk space and providing for granular disaster recovery options. The three disaster recovery models offered by SQL Server are:
1. Simple Recovery Model
2. Full Recovery Model
3. Bulk-logged Recovery Model
Question 14 :
SERIALIZABLE is the strictest isolation level.
Question 15 :
With SQL Server pessimistic locking, no lock is obtained until the user updates the data.