File Management - IBM

externally described database file which has one field, or a program described
physical file. If the file has one field, the data type must be CHARACTER, IGC
OPEN, IGC EITHER, IGC ONLY, GRAPHIC, or variable length. The record
length of the import file should be long enough to contain the longest record of
the file being sent to the AS/400.
2. Send the data to the import file or from-file. Sending the data into the import
file causes the necessary ASCII to EBCDIC data conversions to occur. There are
several ways to import the data such as:
v TCP/IP file transfer (text transfer)
v CA/400 support (file transfer, ODBC)
v CPYFRMTAP command (copy from tape file)
3. Create a DB2 for AS/400 externally described database file, or DDM file, which
will contain the resultant data of the import file.
4. Use the CPYFRMIMPF command to copy (translate or parse the records) from
the import file to the to-file. For importing large files, you can choose to have
the import file split-up into multiple parts so that each part can be processed in
parallel on an N-way multi-processor system. See “Parallel data loader support
to use with the CPYFRMIMPF command” on page 143 for more information
about using multiple jobs during the copy.
5. You should also use the following “Tips to improve the performance of the
CPYFRMIMPF command”.
Tips to improve the performance of the CPYFRMIMPF command
Follow these steps to inprove the performance of the CPYFRMIMPFcommand:
1. Delete any logical keyed files based on the TOFILE.
2. Remove all constraints and triggers of the TOFILE.
3. Ensure the FROMFILE records will be copied correctly by attempting to copy a
few of the records. Copy a few of the records using the FROMRCD and
number of records option.
4. Use the ERRLVL(*NOMAX) parameter after you know you can copy the data
correctly.
5. When the ERRLVL(*NOMAX) parameter is used, record blocking increases
performance. If an error in writing a record occurs during record blocking, the
number of records listed as being copied in the completion message, CPC2955,
may not be accurate.
(CPYFRMIMPF) Importing data to AS/400 when the import file
is a stream file
142 File Management V4R5
If the import file is a stream file, use the following steps for importing data to the
AS/400:
1. Create a DB2 for AS/400 externally described database file, or DDM file, which
will contain the resultant data of the import file.
2. Use the CPYFRMIMPF command to copy (translate or parse the records) from
the import file to the to-file. For importing large files, you can have the import
file split-up into multiple parts. The multiple parts then process in parallel.
3. When the stream file (the import file) has records to copy to the externally
described database or DDM file (the to-file), a temporary file is created to
contain the job or jobs from that stream file. The temporary file, created by the
system, acts as an intermediate place for holding records, and then copying