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ESSnet DataWareHousing - questionnaire 2
Questionnaire
Starting Point
• Data model perspective• Proces model perspective
• Meta data very important• Position of Business Register in system ??
• Needs of other NSIs
ESSnet DataWareHousing: questionnaire 3
Data model perspective
MAIN MOTIVATION: FLEXIBLE + CONSISTENT OUTPUT
ESSnet DataWareHousing Questionnaire 4
Process model perspective
Production processes
Input 1
Input 2
Data warehouse
The ‘process model’ perspective
Output 1
Output 2
Output 3
Known production processes, exploiting synergies or experience
processes
Knowninputs
Knownoutputs
Metadataattached to production process
MAIN MOTIVATION: EFFICIENCY IN PROCESS
ESSnet DataWareHousing Questionnaire 5
Questionaire
21.3.2011:- 21 responses (one per country considered); non-respons homogeneously distributed over Europe
- Many countries mention that “DWH” work is in progress or their system is partially implemented
- Inconsistencies in the answers, possibly related due to current vs. future situationdifferent perception of used terminology
- Most countries sent in a ‘common view’, but….. In case of >1 answer per country: answers on questions might differ
ESSnet DataWareHousing Questionnaire 7
Motivations for DWH
CONCLUSION:- data-integration,datalinking and efficiency are main motivations
ESSnet DataWareHousing Questionnaire 8
Questionnaire on perspectives
This suggests:- “Data model: ~ 9 countries- “ Process model” ~ 6 countries- “ mix of approaches” ~ 6 countries
ESSnet DataWareHousing Questionnaire 9
Questionnaire: answers on perspectives II
Two remarks:1.“ Process model” : 6 countries > one-to-one correspondences : 4 countries
2.if main characteristic of “data model perspectives” = flexibility in output, then most countries (17) have some “data model perspectives”in their system
ESSnet DataWareHousing Questionnaire 10
Questionnaire: answers on perspectives II
GENERAL IMPRESSION: preferred situation= data model perspectiveIn practice most countries start with a process data approach (and expand it at a later stage)
-> “data model” / “process model” perspective description do NOT discriminate between the practices
ESSnet DataWareHousing Questionnaire 11
Questionnaire: terminology
“data model” & “process model” perspectives were introduced two express that two main motivations may lead to starting a DWH- process efficiency- more flexible + consistent output
However, -questionnaire does not reveal a clear dinstinction between these motivations- models are not exclusive- in practice a mix is used (maybe related to “live phase” of the DWH
Proposal: use “data model perspective as ideal situation
?
ESSnet DataWareHousing Questionnaire 12
Meta data
Conclusion:Meta data are considered as important, but are not always integrated in the systems (yet ?)
Question: Which metadata to be used in DWH ?
ESSnet DataWareHousing Questionnaire 13
Conceptual differences II
Apparently differences in approaches
ESSnet DataWareHousing Questionnaire 14
Conceptual differences: active versus passive
surveys
Admin data
census
Cleaned input
Processed data I
Processed data II
Processed data III
Output data
Aggregate data
micro data
Time series
Active DWH: processing and storage NOT separated
Active DWH: proccessing steps between storage
Business register – not integral part
ESSnet DataWareHousing Questionnaire 15
Conceptual differences III
DWH model/system
Active(10)
Passive(11)
Business Reg. integral part
(5)
Business Reg. not integral part
(5)
Business Reg. integral part
(5)
Business Reg. not integral part
(6)
No relationship between (considered) active/passive datawarehouse and position of business register(in answers on questionnaire)
ESSnet DataWareHousing Questionnaire 16
Conceptual differences
CONCLUSION:- implicitly, doubts about business case ??????- output side: different statistical requirements are considered as complex
ESSnet DataWareHousing Questionnaire 17
Conclusions
Flexibility in output; data linking and efficiency in process are the main motivations for DWH ?
“data model” and “process model” descriptions were helpful for the questionnaire, but should be used differenly in future.
Meta data are – indeed – considered as important, and an interesting topic for this ESSnet to work out
Two opinions about DWH:- active vs. passive- position of business registerboth are not linked to each other: but interesting topics for ESSnet to work out
Different statistical requirements (=output ?) are considered as complicated and a possibly interesting topic for this ESSnet to work out
Data confidentiality hardly mentioned
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