HASH-TEST

Produces hashing statistics and optionally a histogram for a specified file based on a user-specified test modulo.

ISTAT is a similar command that provides hashing statistics for items in a selected file.

Command Class

English command.

Syntax

HASH-TEST file-specifier {item-list} {selection-criteria} {(options}
TEST MODULO:modulo

Syntax Elements

file-specifierThe file for which you want statistics.

item-listA list of items for which statistics are required (see Item Lists). This can be provided by a list-generating command executed immediately before HASH-TEST.

selection-criteria Item selection criteria. These can limit the items for which statistics are provided.

moduloThe test modulo value for which the file statistics are required.

Options

H Displays a histogram.

N Removes automatic paging of output to terminal.

P Sends output to printer.

Comments

HASH-TEST can be used to predict the group that a particular item resides in and the distribution of data within the file for a test modulo value.  This information is useful when you are trying resize files. 'IND.' in the report stands for 'indirect', meaning out-of-group.

Refer to the ISTAT command for a description of the information displayed by HASH-TEST.

Example

HASH-TEST ACCPAY (H

TEST MODULO:17

FILE: ACCPAY MOD: 19 SEP: 1 IIDs: Sensitive            12:52:16  30 Jun 2009
  BYTES ITMS
     537   8 *>>>>>>>>
     761   5 *>>>>>
      65   3 *>>>
     217   4 *>>>>
     265   5 *>>>>>
     665  11 *>>>>>>>>>>>
      73   4 *>>>>
    1033   9 *>>>>>>>>>
     665   8 *>>>>>>>>
     473   8 *>>>>>>>>
     161   8 *>>>>>>>>
     625  10 *>>>>>>>>>>
     665   5 *>>>>>
     473   8 *>>>>>>>>
     793   8 *>>>>>>>>
      65   3 *>>>
     609   5 *>>>>>

Item count=       112, byte count=      8128, avg. bytes/item=     72.5
avg. item/group=  6.5, std. deviation=   2.4, avg. bytes/group=   478.1
frames in use=     18, sec. framesS=       1, empty groups=           1
ind. items=        12, ind. frames=       14