Data Modeling Standards | Modeling Data
Data Modeling standardization has been in practice for many years and the following section highlight the needs and implementation of the data modeling standards.
Standardization Needs | Modeling data:
Several data modelers may work on the different subject areas of a data model and all data modelers should use the same naming convention, writing definitions and business rules.
Nowadays, business to business transactions (B2B) are quite common, and standardization helps in understanding the business in a better way. Inconsistency across column names and definition would create a chaos across the business.
For example, when a data warehouse is designed, it may get data from several source systems and each source may have its own names, data types etc. These anomalies can be eliminated if a proper standardization is maintained across the organization.
Table Names Standardization:
Giving a full name to the tables, will give an idea about data what it is about. Generally, do not abbreviate the table names; however this may differ according to organization’s standards. If the table name’s length exceeds the database standards, then try to abbreviate the table names. Some general guidelines are listed below that may be used as a prefix or suffix for the table.
Lookup – LKP – Used for Code, Type tables by which a fact table can be directly accessed.
e.g. Credit Card Type Lookup – CREDIT_CARD_TYPE_LKP
Fact – FCT – Used for transaction tables:
e.g. Credit Card Fact – CREDIT_CARD_FCT
Cross Reference – XREF – Tables that resolves many to many relationships.
e.g. Credit Card Member XREF – CREDIT_CARD_MEMBER_XREF
History – HIST – Tables the stores history.
e.g. Credit Card Retired History – CREDIT_CARD_RETIRED_HIST
Statistics – STAT – Tables that store statistical information.
e.g. Credit Card Web Statistics – CREDIT_CARD_WEB_STAT
Column Names Standardization:
Some general guidelines are listed below that may be used as a prefix or suffix for the column.
Key – Key System generated surrogate key.
e.g. Credit Card Key – CRDT_CARD_KEY
Identifier – ID – Character column that is used as an identifier.
e.g. Credit Card Identifier – CRDT_CARD_ID
Code – CD – Numeric or alphanumeric column that is used as an identifying attribute.
e.g. State Code – ST_CD
Description – DESC – Description for a code, identifier or a key.
e.g. State Description – ST_DESC
Indicator – IND – to denote indicator columns.
e.g. Gender Indicator – GNDR_IND
Database Parameters Standardization:
Some general guidelines are listed below that may be used for other physical parameters.
Index – Index – IDX – for index names.
e.g. Credit Card Fact IDX01 – CRDT_CARD_FCT_IDX01
Primary Key – PK – for Primary key constraint names.
e.g. CREDIT Card Fact PK01- CRDT-CARD_FCT_PK01
Alternate Keys – AK – for Alternate key names.
e.g. Credit Card Fact AK01 – CRDT_CARD_FCT_AK01
Foreign Keys – FK – for Foreign key constraint names.
e.g. Credit Card Fact FK01 – CRDT_CARD_FCT_FK01
If you are joining in a company as a data modeler, first speak with DBAs or the software configuration management team to know the standards.