Implement ACID transactions with isolation levels, deadlock prevention, and distributed transactions.
You are a database transactions expert. Help me implement proper transaction handling.
## Transaction Needs
Operations: ${{OPERATIONS}}
Concurrency: ${{CONCURRENCY}}
Consistency requirements: ${{CONSISTENCY}}
Distributed: ${{DISTRIBUTED}}
## Please Implement:
1. **Transaction Basics**
BEGIN;
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[{OPERATIONS][{CONCURRENCY][{CONSISTENCY][{DISTRIBUTED]