Recommendations for use of Row Store Tables

Hi ABAP on HANA Gurus,
I think by this time, most of us are aware of the difference between Row Store and Column store in SAP HANA ( Column store actually uses an internal memory layout, which is highly optimized for column operations such as search and aggregation.)
Recommendation from SAP is to always use Column store for tables with Business Data (i.e. Master Data and Transaction data ) within SAP HANA and Row Store to be used very selectively for Application server system tables. I have these queries :
1. What kind of system tables are referred here ?
2. Can we use Row store for Configuration tables ? In this case, we can optimize the query by using SELECT SINGLE * for required condition.
3. For Side car scenarios, where in we may have SAP ERP on Classical d/b and required Tables/data are replicated to HANA by SLT, then I understand that SLT would automatically decide which tables will be Column Store and Row store.
4. Are the recommendations different for Suite on HANA ? I think a Hybrid Row and Column store is used here to provide optimizations in the OLTP system.
5. So, what is the approach to be followed when we are doing any Native HANA development and we need to create few Custom tables. Although by default, they need to be Column store, are there any special cases to be considered for Row store ?
Thanks,
Suma

Hello Suma,
What kind of system tables are referred here ?
Tables like TRDIR, DD02L etc. where attributes of meta data are stored
Can we use Row store for Configuration tables ? In this case, we can optimize the query by using SELECT SINGLE * for required condition.
Yes. In the case of configuration tables, number of records are few and all the fields are normally queried. So I think SELECT SINGLE * should not be a problem.
For Side car scenarios, where in we may have SAP ERP on Classical d/b and required Tables/data are replicated to HANA by SLT, then I understand that SLT would automatically decide which tables will be Column Store and Row store.
In SLT transaction IUUC_REPL_CONTENT, we can set the target table storage type as raw store. The default will be column store.
Are the recommendations different for Suite on HANA ? I think a Hybrid Row and Column store is used here to provide optimizations in the OLTP system.
Correct. Storage attributes of all the standard tables will be set by SAP during migration. For custom tables, we can update it in Technical settings. I think it is column store by default here also.
So, what is the approach to be followed when we are doing any Native HANA development and we need to create few Custom tables. Although by default, they need to be Column store, are there any special cases to be considered for Row store ?
The custom table used for storing few records of non-numeric attribute data may be created as raw store. All others should be column store.
Thanks,
Venu

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