Structural integrity during a system crash is maintained by InterSystems write image journal (WIJ) technology, as described in the chapter “ Write Image Journaling and Recovery”, and InterSystems IRIS's internal algorithms. To have structural integrity, the database blocks must be self-consistent and the globals traversable. Structural database integrity, or physical integrity, refers to the contents of the database blocks on disk. In general, there are two different levels at which integrity can be viewed: The DataCheck utility lets you compare the state of data that exists on two systems to determine whether they are consistent.Ĭopy link to this section Fundamental Data Integrity Protection Journaling and transaction processing maintain logical integrity and used together with backup and restore enable rapid recovery from physical integrity failures.
Write image journaling technology protects against structural integrity failures due to system crashes.īackup and restore strategies used together with journaling enable rapid recovery from physical integrity failures. The remaining chapters cover the following topics: This chapter explains how structural integrity is maintained and how to verify it. Together with a backup strategy, journaling provides rapid recovery from physical integrity failures. InterSystems IRIS write image journaling technology protects against structural integrity failures, while logical integrity is maintained by InterSystems IRIS journaling and transaction processing.
The integrity of the data in every InterSystems IRIS® database is protected from the consequences of instance and system failure by the features described in this guide. Integrity Verification and Recovery Mechanisms.
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