Determine when to skip selected fragments
In certain circumstances, you might want the database
server to skip some fragments, but not others. This usually occurs
in the following situations:
- Fragments can be skipped because they do not contribute significantly to a query result.
- Certain fragments are down, and you decide that skipping these fragments and returning a limited amount of data is preferable to canceling a query.
When you want to skip fragments, use the ON dbspace-list setting to specify a list of dbspaces with the fragments that the database server must skip.