System User DBC - Analytics Database - Teradata Vantage

Database Administration

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-11-03
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lifecycle
latest
Product Category
Teradata Vantageā„¢

The space allocation of system user DBC is used for the following:

DBC Space Purpose
PERM Provides ownership of the Teradata production database space, which must accommodate the maximum PERM space allocated to each user and database by its creator.

The allocated space is used to store the rows in the data tables created by each user, including the following items:

  • Primary data table rows
  • Join index table rows
  • Hash index table rows
  • LOB and XML subtable rows
  • Secondary index subtable rows
  • Optional permanent journal image rows
  • Optional fallback rows, which replicate the rows of primary data tables, index subtables, hash and join index tables, and permanent journals
Creates and maintains the WAL log/transient journal, storing a before-image copy of every row affected by data changes in all current sessions and Redo and Undo WAL records.
Stores in the Data Dictionary the definitions for system tables, indexes, macros, triggers, and views.
Provides permanent space for the following:
  • Table headers.

    Note that each materialized global temporary table also requires a minimum of 512 bytes from the PERM space of its containing database or user for its table header.

  • CRASHDUMPS database.
TEMP Provides temporary space for data inserted into materialized global temporary tables.
SPOOL Provides maximum defined SPOOL space to each user and database for the following uses:
  • Dynamic allocation and release of intermediate and final result sets during query processing.
  • Volatile temporary tables.