Specific protection for the data in a table is provided by the FALLBACK, JOURNAL, and CHECKSUM options.
FALLBACK causes a duplicate, or fallback, copy to be maintained by Teradata Database. The fallback copy is used if the primary copy becomes unavailable.
JOURNAL provides data protection through system-generated BEFORE- and AFTER-journals that contain the before and after images of data that changes as a result of any INSERT, UPDATE, or DELETE operations.
These journals are used by the database either to restore a table or to roll back the changes that were made to a table.
The CHECKSUM option provides disk I/O integrity checking of primary table data rows, fallback table data rows, and secondary index subtable rows.