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The hash join method is typically used for longer running join queries.
The original query will be subdivided into hash join steps.
Each
hash join step will be optimized and processed separately. Debug messages
which explain the implementation of each hash join step follow this message
in the joblog.
The list below shows the names of the files
or the table functions used in this query. If the entry is for a file, the
format of the entry in this list is the number of the hash join step, the
filename as specified in the query, the member name as specified in the query,
the filename actually used in the hash join step, and the member name actually
used in the hash join step. If the entry is for a table function, the format
of the entry in this list is the number of the hash join step and the function
name as specified in the query.
If there are two or more
files or functions listed for the same hash step, then that hash step is implemented
with nested loop join. |