Which timestamp is denoted by the W-timestamp (Q) of a transaction?

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

Rollback causes the current transaction to:

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

A Decision Table facilitates conditions to be related to:

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

Head Crash on the disk is:

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

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:

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

The two-phase commit protocol may introduce: