Progress
Version 9
Product Update Bulletin


CRC Calculation

Table B–2 lists the metaschema fields that are involved in each CRC calculation.

Table B–2: Metaschema Fields In CRC Calculation 
Metaschema Table
_File
_Field
_Index
_Index–Field
_File–Name
_DB–lang
_Field–Name
_Data–Type
_dtype
_sys–field
_field–rpos
_Decimals
_Order
_Extent
_Fld–stdtype
_Fld–stlen
_Fld–stoff
_Fld–case
_Index–Name
_Unique
_num–comp
(_Field–Name)1
_Ascending
_Abbreviate
_Unsorted
  1. The _Field–Name for index fields is referenced in the _Field table using _Field–recid in _Index–Field.

CRC Calculation For Tables

All of the listed metaschema fields, participate in the CRC calculation for each database table. The resulting CRC is stored in the _CRC field of the _File record for each table. A change to any of these fields automatically changes the value of _CRC.


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