ODS vs DWH vs DM

hi guru
whats diff between ODS vs DWH vs DM?
anand

hi anand
DSO
- Acts as source to populate DW and marts
- Often used for operational reporting
- Detailed, atomic data
- Huge data volumes
- Integrated, clean data
- Cross-functional and cross-departmental
- Supports data mining
- May use denormalized form modeling (NOT dimensional)
DWH
- Provides mgmt reporting
- Summarized data
- Tuned to optimize query performance
- Multiple departments or processes
- May act as staging area for data marts
- Uses dimensional data modeling
DMart
- Specific application or workgroup focus
- Narrow scope
- Customized or stand alone analysis
- Interactive query
- Highly summarized
- Single subject and department oriented
- Uses dimensional data modeling
jeeva

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