17.00 - TEMPORARY - 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)

Temporary space allowed for creating materialized global temporary tables by this user. Temporary space is reserved prior to spool space for any user defined with this characteristic.

If no temporary space is defined for a user, then the space allocated for any materialized global temporary tables referenced by that user is set to the maximum temporary space allocated for the immediate owner.

Note that each materialized global temporary table requires a minimum of 512 bytes of PERM space to contain its table header.

Disk usage for a materialized temporary table is charged to the temporary space allocation of the user who referenced the table.

n
Number of bytes allowed for creating materialized global temporary tables by this user.
constant_expression
Any SQL expression that does not make any column references. Specifying an appropriate constant expression for the TEMPORARY space size of a user enables Vantage to assign an optimal quantity of TEMPORARY space that scales to the size of your system by allocating TEMPORARY space on a per AMP basis.
When you specify a TEMPORARY 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 TEMPORARY space allowed.
SKEW
Keyword that you use to specify a skew limit for TEMPORARY 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 + tempskewlimit/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 DefaultTempSkewLimitPercent.
PERCENT
Optional keyword that you can include for readability to indicate that the constant_expression or DEFAULT keyword specifies a percentage of allowable skew.