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Data & Analytics · Intermediate

Read Committed

An isolation level in which a transaction sees only committed data, though values may change between reads.

Definition

Read Committed is the default in SQL Server, Oracle and PostgreSQL. It prevents dirty reads but allows non-repeatable reads and phantoms. Snowflake supports only Read Committed for tables.

Exam tip

Read Committed is the most common default; it still allows non-repeatable reads.

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