File System: Cylinder Split and Migrate Overhead Columns - Advanced SQL Engine - Teradata Database

Resource Usage Macros and Tables

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
17.00
Published
June 2020
Language
English (United States)
Last Update
2021-01-23
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dita:id
B035-1099
lifecycle
previous
Product Category
Teradata Vantageā„¢

These columns further identify file system cylinder split/migrate (CylMigr) overhead performed when cylinders can not accommodate new data.

Event counts are found in ResUsageSvpr Table Overview.

Only logical I/Os and the amount moved (KB) for data blocks are identified. Each cylinder migration event implies one logical read and three logical writes of the cylinder index. Only permanent tables (including append and transient journal tables) are migrated.

Column Name Mode Description Data Type
FileDbCylMigrKB count KB moved by FileDbCylMigrIOs. FLOAT
FileDbCylMigrIO count Number of data block logical I/Os due to cylinder migration. FLOAT