17.10 - DisableSyncScan - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Database Utilities

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Configuration
Publication ID
B035-1102-171K
Language
English (United States)

Disables or enables caching portions of large tables for the purpose of synchronized full table scans. The amount of cache that can be used for synchronized scans is set using the SyncScanCacheThr field.

Field Group

Performance

Valid Settings

Setting Description
TRUE Disables synchronized full table scanning of large tables.
FALSE Enables synchronized full table scans.

Default

FALSE

Changes Take Effect

After the next database restart.

Usage Notes

The synchronized full-table scan feature of Teradata allows several table scanning tasks to simultaneously access the portion of a large table that is currently in the cache. Synchronized table scans happen only when full-table scans access similar areas of a large table. Synchronized table scans can improve database performance by reducing the required disk I/O. Synchronized table scans are available only to large tables undergoing full-table scans.

Related Information

See SyncScanCacheThr.