17.10 - AutoCylPackStyle - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - 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)

Determines whether the AutoCylPack (automatic background cylinder packing) task is restricted to packing data, unpacking data, or if it is unrestricted, and can both pack and unpack data to achieve the target free space percentage (FSP) on a cylinder.

The AutoCylPack task can pack cylinder data more tightly, to store more data on fewer cylinders. This can improve the efficiency of performing sequential scans of tables and also frees up cylinders to be used elsewhere.

Alternatively, the AutoCylPack task can unpack cylinder data, to free more space on a cylinder. This can improve the speed of updates to tables occupying those cylinders, at the cost of consuming more cylinders for the given amount of data.

Field Group

File System

Valid Settings

Setting Description
1 AutoCylPack is restricted to packing data more tightly on cylinders.
2 AutoCylPack is unrestricted, so can both pack and unpack data as necessary to achieve the target FSP.
3 AutoCylPack is restricted to unpacking data, arranging it more loosely on and between cylinders.

Default

2

Changes Take Effect

After the DBS Control Record has been written.

Related Information

For more information on… See…
AutoCylPack DisableAutoCylPack.
Free Space Percent FreeSpacePercent, SHOWFSP, Teradata Vantage™ - Database Administration, B035-1093.