July 2010
Intermediate to advanced
458 pages
9h 48m
English
Content preview from InfoSphere DataStage Parallel Framework Standard Practices
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Estimating the size of a parallel dataset
For the advanced user, this Appendix provides a more accurate and detailed way to estimate the size of a parallel dataset based on the internal storage requirements for each data type. We have listed the data types and their sizes in Table F-1 on page 412.
Table F-1 Data types and sizes
|
Data Type
|
Size
|
|
Integers
|
4 bytes
|
|
Small Integer
|
2 bytes
|
|
Tiny Integer
|
1 byte
|
|
Big Integer
|
8 bytes
|
|
Decimal
|
(precision+1)/2, rounded up
|
|
Float
|
8 bytes
|
|
VarChar(n)
|
n + 4 bytes for non-NLS ... |
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