16.20 - Specifying Data Protection - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1184-162K
Language
English (United States)

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 Teradata 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.