Differences between Change Capture stage and Difference stage in DataStage
I'm trying to implement SCD Type1 loading using Change Capture and Difference stages in DataStage. Both these jobs are working fine without any errors, but i would like to know what was differences between these two stages and which one will deliver a better performance?
I had tried several test cases to find the differences few that i had found were
- In Change capture stage we need to have both the inputs with same number of columns and same column names with similar datatypes but that was not the case in Difference stage.
Could someone help me to figure out what the actual important analogy between these 2 stages. (Any related web links are welcome)
Thank you.
datastage
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
add a comment |
I'm trying to implement SCD Type1 loading using Change Capture and Difference stages in DataStage. Both these jobs are working fine without any errors, but i would like to know what was differences between these two stages and which one will deliver a better performance?
I had tried several test cases to find the differences few that i had found were
- In Change capture stage we need to have both the inputs with same number of columns and same column names with similar datatypes but that was not the case in Difference stage.
Could someone help me to figure out what the actual important analogy between these 2 stages. (Any related web links are welcome)
Thank you.
datastage
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
add a comment |
I'm trying to implement SCD Type1 loading using Change Capture and Difference stages in DataStage. Both these jobs are working fine without any errors, but i would like to know what was differences between these two stages and which one will deliver a better performance?
I had tried several test cases to find the differences few that i had found were
- In Change capture stage we need to have both the inputs with same number of columns and same column names with similar datatypes but that was not the case in Difference stage.
Could someone help me to figure out what the actual important analogy between these 2 stages. (Any related web links are welcome)
Thank you.
datastage
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
I'm trying to implement SCD Type1 loading using Change Capture and Difference stages in DataStage. Both these jobs are working fine without any errors, but i would like to know what was differences between these two stages and which one will deliver a better performance?
I had tried several test cases to find the differences few that i had found were
- In Change capture stage we need to have both the inputs with same number of columns and same column names with similar datatypes but that was not the case in Difference stage.
Could someone help me to figure out what the actual important analogy between these 2 stages. (Any related web links are welcome)
Thank you.
datastage
datastage
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
asked Nov 28 '18 at 14:18
Adithya AlapatiAdithya Alapati
617
617
add a comment |
add a comment |
1 Answer
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Performance is not the point - they should be compareable - more important is the functionality point of view.
The DIFFERENCE stage returns the "before" columns and after columns only in some situations (if they are not part of the key or value columns and are named differently)
The CHANGE CAPTURE stage returns the "after" columns. BEfore columns are only available for Deletes
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
Thanks MichaelTiefenbacher for answering, but is it all about what the output columns that we are getting from the stage or any other differences?
– Adithya Alapati
Nov 29 '18 at 4:33
Well there are more differences - like options to configure the stage or the returned codes are slightly different (per default). With Change Capture you have the "All Keys, Explicit Values" etc. options to configure its behaviour. Personally I user the Change Capture more frequently in scenarions where I need to determine deltas.
– MichaelTiefenbacher
Nov 29 '18 at 6:10
add a comment |
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1 Answer
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oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Performance is not the point - they should be compareable - more important is the functionality point of view.
The DIFFERENCE stage returns the "before" columns and after columns only in some situations (if they are not part of the key or value columns and are named differently)
The CHANGE CAPTURE stage returns the "after" columns. BEfore columns are only available for Deletes
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
Thanks MichaelTiefenbacher for answering, but is it all about what the output columns that we are getting from the stage or any other differences?
– Adithya Alapati
Nov 29 '18 at 4:33
Well there are more differences - like options to configure the stage or the returned codes are slightly different (per default). With Change Capture you have the "All Keys, Explicit Values" etc. options to configure its behaviour. Personally I user the Change Capture more frequently in scenarions where I need to determine deltas.
– MichaelTiefenbacher
Nov 29 '18 at 6:10
add a comment |
Performance is not the point - they should be compareable - more important is the functionality point of view.
The DIFFERENCE stage returns the "before" columns and after columns only in some situations (if they are not part of the key or value columns and are named differently)
The CHANGE CAPTURE stage returns the "after" columns. BEfore columns are only available for Deletes
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
Thanks MichaelTiefenbacher for answering, but is it all about what the output columns that we are getting from the stage or any other differences?
– Adithya Alapati
Nov 29 '18 at 4:33
Well there are more differences - like options to configure the stage or the returned codes are slightly different (per default). With Change Capture you have the "All Keys, Explicit Values" etc. options to configure its behaviour. Personally I user the Change Capture more frequently in scenarions where I need to determine deltas.
– MichaelTiefenbacher
Nov 29 '18 at 6:10
add a comment |
Performance is not the point - they should be compareable - more important is the functionality point of view.
The DIFFERENCE stage returns the "before" columns and after columns only in some situations (if they are not part of the key or value columns and are named differently)
The CHANGE CAPTURE stage returns the "after" columns. BEfore columns are only available for Deletes
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
Performance is not the point - they should be compareable - more important is the functionality point of view.
The DIFFERENCE stage returns the "before" columns and after columns only in some situations (if they are not part of the key or value columns and are named differently)
The CHANGE CAPTURE stage returns the "after" columns. BEfore columns are only available for Deletes
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
answered Nov 28 '18 at 19:21
MichaelTiefenbacherMichaelTiefenbacher
2,3072715
2,3072715
Thanks MichaelTiefenbacher for answering, but is it all about what the output columns that we are getting from the stage or any other differences?
– Adithya Alapati
Nov 29 '18 at 4:33
Well there are more differences - like options to configure the stage or the returned codes are slightly different (per default). With Change Capture you have the "All Keys, Explicit Values" etc. options to configure its behaviour. Personally I user the Change Capture more frequently in scenarions where I need to determine deltas.
– MichaelTiefenbacher
Nov 29 '18 at 6:10
add a comment |
Thanks MichaelTiefenbacher for answering, but is it all about what the output columns that we are getting from the stage or any other differences?
– Adithya Alapati
Nov 29 '18 at 4:33
Well there are more differences - like options to configure the stage or the returned codes are slightly different (per default). With Change Capture you have the "All Keys, Explicit Values" etc. options to configure its behaviour. Personally I user the Change Capture more frequently in scenarions where I need to determine deltas.
– MichaelTiefenbacher
Nov 29 '18 at 6:10
Thanks MichaelTiefenbacher for answering, but is it all about what the output columns that we are getting from the stage or any other differences?
– Adithya Alapati
Nov 29 '18 at 4:33
Thanks MichaelTiefenbacher for answering, but is it all about what the output columns that we are getting from the stage or any other differences?
– Adithya Alapati
Nov 29 '18 at 4:33
Well there are more differences - like options to configure the stage or the returned codes are slightly different (per default). With Change Capture you have the "All Keys, Explicit Values" etc. options to configure its behaviour. Personally I user the Change Capture more frequently in scenarions where I need to determine deltas.
– MichaelTiefenbacher
Nov 29 '18 at 6:10
Well there are more differences - like options to configure the stage or the returned codes are slightly different (per default). With Change Capture you have the "All Keys, Explicit Values" etc. options to configure its behaviour. Personally I user the Change Capture more frequently in scenarions where I need to determine deltas.
– MichaelTiefenbacher
Nov 29 '18 at 6:10
add a comment |
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