hash-test Command

The hash-test command produces a histogram, or graphic representation of item-ID distribution within a given file, according to a test modulo provided. The command is useful when performing file reallocation, providing insight into how the item-IDs hash into the file, as well as providing a suggested modulo.

Syntax

hash-test file.reference {item.list} {selection.criteria} {(options}

test modulo:modulo

Parameter(s)

options

s

Displays the summary statistics only.

Example(s)

hash-test testfile

test modulo:  3

file= testfile modulo= 3 10:07:24 14 Feb 2003

frames

bytes

items

 

 

1

444

1 *>

 

 

1

772

2 *>>

 

 

1

1742

2 *>>

 

 

3

 

 

 

 

Hash-Test/Istat Statistics

total item count

=

5

byte count =

2958

avg. bytes/item

=

591.6

avg. items/group =

1.6

std. deviation

=

.5

avg. bytes/group =

986.0

suggested modulo

=

3

 

 

This file has three groups, a total of five items. Each hash mark (>) indicates an item.

See Also

AQL Command Categories

File Reference

istat Command

item Command