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Data & Analytics · Intermediate

Read Uncommitted

The lowest isolation level, which takes no shared locks on reads and allows dirty reads.

Definition

Read Uncommitted maximizes concurrency at the cost of consistency. It is sometimes used for rough monitoring queries but is unsuitable for financial or exact reporting.

Example

SELECT * FROM Orders WITH (NOLOCK);

Exam tip

Read Uncommitted is the only standard level that permits dirty reads.

Related terms