17.00 - CHECKSUM - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.00
Release Date
September 2020
Content Type
Programming Reference
Publication ID
B035-1144-170K
Language
English (United States)

A table-specific disk I/O integrity checksum for detection of hardware read errors. The checksum level setting applies to primary data rows, fallback data rows, and all secondary index rows for the table.

For a system-defined join index, the integrity checking setting you specify for a base table also applies to any system-defined join indexes defined on that table. You cannot specify integrity checking for a system-defined join index directly.

The HIGH, MEDIUM, LOW settings are deprecated and are equivalent to specifying ON.
ON
Calculate checksums using the entire disk block. Sample 100% of the disk blocks to generate a checksum. ON is equivalent to ALL, which is deprecated.
OFF
Disables checksum disk I/O integrity checks. OFF is equivalent to NONE, which is deprecated.
DEFAULT
The default setting is the current DBS Control checksum setting specified for this table type.
IMMEDIATE
The checksum setting is updated immediately for this table, including all data blocks and cylinder indexes. If you do not specify this option, the checksum setting is updated the next time the data blocks and cylinder indexes are updated and written to disk.