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1. Deadlock

   • Time out
   • Detection
   • Prevention
     • Wound wait
     • Wait die

2. Graph based

   • Partial order
   • Exclusive lock
   • Protocol

3. Timestamp based

   • Restart
   • Read
   • Thomas Write Rules
   • White

4. Operations

   • Unlock
   • Lock
     • Shared
     • Exclusive

5. Two Phase Locking

   • Plain
   • Strict
   • Rigorous
   • Practical Protocol