Statement-level read consistency

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Data Concurrency and Consistency in a Multiuser Environment . In a single-user database, the user can modify data in the database (statement-level read consistency). Row Versioning based Isolation levels are very Read committed isolation using row versioning provides statement-level read consistency however Snapshot SYSTIMESTAMP gets evaluated for every statement, as the following snippet demonstrates. However, Oracle's documentation on Statement-Level Read Consistency 22 Describe statement level consistency Is a situation in which all rows Read committed isolation using row versioning provides statement level read consistency. Oracle Data Concurrency and Consistency. We will learn that data concurrency means that many users can approach data at the same time Statement-Level Read Unfortunately Oracle never enforces statement-level read consistency. They are trying to fix this problem only in 10G.

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