OpenEdge Deployment:<br />Managing 4GL Applications 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-stlen¹ _Fld-stoff _Fld-case	_Index-Name _Unique _num-comp	(_Field-Name)² _Ascending _Abbreviate _Unsorted

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-stlen¹ 
_Fld-stoff 
_Fld-case

_Index-Name 
_Unique 
_num-comp

(_Field-Name)² 
_Ascending 
_Abbreviate 
_Unsorted

¹The _Fld-stlen is not involved in the CRC calculation for BLOB and CLOB fields.

²The _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.