- Lock
- Data integrity
- Transaction control
- Exclusive or share
- Exclusive row level
- Table or row
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- Valid relationships between tables
- Mode of a lock
- A marker imposed on a table or row that|||prevents concurrent updates
- Level of a lock
- A command in PL/SQL to tell Oracl|||when a transaction starts or ends
- The implicit lock created on a ro|||when you update or delete it
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