Select the most appropriate statement from the following:

The two-phase commit protocol may introduce:

After a transaction completes successfully, the changes made to the database are reflected even if there are system failures This is referred to as:

If in relation r, values x and y are only dependent on the primary key and not on each other, then they are said to be:

A phase when a transaction may obtain locks but may not release any lock is:

Head Crash on the disk is:

Once a transaction commits, its update survives even if there is a subsequent system crash This is:

A Decision Table facilitates conditions to be related to:

The cost of physically linking the sites in the system is:

Rollback causes the current transaction to:

The candidate key which is not a primary key is said to be: