BEGIN OPTIMIZE Command | Specifying Data Temperatures | Teradata Vantage - 17.10 - BEGIN OPTIMIZE - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - Teradata® Virtual Storage

Advanced SQL Engine
Teradata Database
Release Number
Release Date
July 2021
Content Type
Publication ID
English (United States)

Initiates immediate, high-priority migrations necessary to move cylinders modified by the FORCE command to appropriate classes of storage. Normal migration is a background process with a lower priority.

BEGIN OPTIMIZE initiates optimization on all nodes and all tables of the system, not just the tables on which the FORCE command was recently used.

Optimization can cause extremely heavy loads on system resources, and have a negative impact on system performance. If BEGIN OPTIMIZE is used on a production system, it should be used only during scheduled maintenance windows.



Usage Notes

Migrations resulting from BEGIN OPTIMIZE occur at the maximum possible speed, without regard to potential impacts to existing workloads. Because cylinders marked HOT or COLD using the FORCE command are at the maximum temperature extremes, these cylinders are likely to be the first selected for migration, depending on available space.

If space on storage media of appropriate performance grade is not available, some cylinders are moved out of FAST and SLOW storage locations to make room for the HOT and COLD table data, respectively.