Correctness
Explore the role of isolation levels in PostgreSQL to manage transaction consistency and control business logic placement. Understand default settings like Read Committed and alternatives such as Repeatable Read and Serializable to avoid data anomalies and ensure reliable query results.
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When using multiple statements, it’s necessary to set up the isolation level correctly. Also, the connection and transaction semantics of our code should be tightly controlled. Our code snippet here does neither because it uses a default isolation level setting and doesn’t focus on transactions.
Isolation levels in SQL
The SQL standard defines four isolation levels, and PostgreSQL implements three of them, leaving out dirty reads. The isolation level determines which side effects from other transactions our transaction is sensitive to. The PostgreSQL documentation section entitled ...