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1. Two Phase Locking

   • Practical Protocol
   • Plain
     • shrinking
     • Growing
   • Rigourous
     • Cascadeless
   • Strict
     • Recoverable

2. Deadlock

   • prevention
     • wait die
       • Non-premptive
     • would die
       • Preemptive
   • Timeout
   • Detection
     • Wait For Graph

3. operation

   • unlock
   • lock
     • exclusive
     • shared

4. Degree of isolation

   • phantom read
   • Unrepetable read
   • dirty read

5. Timestamp based

   • No Locks
   • restart
   • write max
   • read max
   • thomas write rule