Inversion - Reversal
Enhanced Definition
In the mainframe context, "Inversion" primarily refers to the creation and use of **inverted files** or **inverted indexes** to facilitate rapid data retrieval based on non-primary key fields. "Reversal," on the other hand, refers to the process of undoing a previously completed transaction or data modification, ensuring data integrity and consistency. While distinct, both concepts are critical for efficient data management and robust transaction processing on z/OS.
Key Characteristics
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- Inversion (Inverted Files/Indexes): Provides fast access paths to data records by creating a secondary index that maps specific field values to the addresses of records containing those values. This is a form of secondary indexing.
- Inversion (Inverted Files/Indexes): Often