Description of the illustration cncpt308.eps

The top icon shows Table Parent. To the upper left is a lock icon. The table contains Row 1 with column Key 1, Row 2 with column Key 2, Row 3 with column Key 3, Row 4 with column Key 4. Row 3 is shaded. To the left of Row 3 is a lock icon labeled exclusive row lock (TX) acquired. The row is shaded because it is being deleted. To the right of the table is an Index icon with Key 1, Key 2, Key 3 (shaded), and Key 4. There is a lock next to Key 3.

Underneath Table Parent is Table Child. To the upper left of Table Child is a lock icon. The table contains Row 1 with column Key 1, Row 2 with Key 1, Row 3 with Key 2, Row 4 with Key 2, Row 6 with Key 2. The row lock is labeled as an exclusive row lock (TX).