17.00 - PERMANENT - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.00
Release Date
September 2020
Content Type
Programming Reference
Publication ID
B035-1144-170K
Language
English (United States)

Number of bytes to be reserved for permanent storage for this user. The space is taken from unallocated space in the database or user of the immediate owner.

You must specify a value for this option. There is no default.

A global temporary table requires a minimum of 512 bytes from the PERM space of its containing user or database. This space is used for its table header.

You cannot specify any other options for the new user until after you specify the PERMANENT and PASSWORD options.

The only significant difference between a user and a database is that you can specify a password for a user, but not for a database.
n
You can enter the number of bytes as an integer, decimal, or floating point value or as a constant expression whose evaluation determines the number of bytes. You can also enter the value using exponential notation. For example, you can write one thousand as either 1000 or 1E3.
To create a user without database component, specify a value of 0 bytes for PERMANENT space. You must still specify a SPOOL space value for the user.
constant_expression
Any SQL expression that does not make any column references. Specifying an appropriate constant expression for the PERM space size of a user enables Vantage to assign an optimal quantity of PERM space that scales to the size of your system by allocating PERM space on a per AMP basis.
When you specify a PERM space size based on a constant expression, the assigned size does not automatically scale if, for example, you add more AMPs to your system.
BYTES
Optional keyword that redundantly specifies the unit for the amount of space allowed.
SKEW
Keyword that you use to specify a skew limit for PERMANENT space. You can specify a skew limit percentage that allows the maximum AMP space usage to be above the per-AMP quota, that is, the system maximum space limit divided by the number of AMPs.
constant_expression
Constant expression or constant from 0 through 10000. Specify a value from 1 to 9999 to indicate an AMP-level limit, which is the per-AMP quota * (1+permskewlimit/100). Specify 0 to set space accounting to the per-AMP level, that is, no skew. A value of 10000 indicates unlimited skew, up to the system maximum space limit.
DEFAULT
Use the value of DBS Control DefaultPermSkewLimitPercent.
PERCENT
Optional keyword that you can include for readability to indicate that the constant_expression or DEFAULT keyword specifies a percentage of allowable skew.