How do I update Physical Layer

How to I update the table in the physical layer in the OBI admin tool when:
1. the data in the underlying database table changes (meaning the records/rows are added or deleted in the database)
2. the fields in the underlying database table change (meaning columns are added or deleted)
3. the size of the field changes (meaning the type or length of the columns change)
4. only the table names/column names in the underlying database change.
In which of the above cases do I have to import again through the connection pool. If I have to import again do I have to create physical joins in the physical layer and complex joins in the BMM layer and mapping to the new table as LTS and any expressions in the column mappings again?
Thanks for your input.

How to I update the table in the physical layer in
the OBI admin tool when:1. the data in the underlying database table changes
(meaning the records/rows are added or deleted in the
database):
You don't need to take any action here unless you are concerned with query caching. In that case use 'event polling table'. Lookup documentation for event polling table.
2. the fields in the underlying database table change
(meaning columns are added or deleted)
You will need to manually add those in physical layer and propogate to business and presentation layer.
3. the size of the field changes (meaning the type or
length of the columns change)
Go to utilities - update physical layer and select the affected presentation layer.
4. only the table names/column names in the
underlying database change.
You will need to manually change those in physical layer. No need to and propogate to business and presentation layer ans its is automatically taken care of.
In which of the above cases do I have to import again
through the connection pool. If I have to import
again do I have to create physical joins in the
physical layer and complex joins in the BMM layer and
mapping to the new table as LTS and any expressions
in the column mappings again?
No need in any case to import manually.
Thanks for your input.

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