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On 23/09/2004, at 7:15 AM, kirkg@xxxxxxxxxxxxx wrote:
What is the impact of changing the system CCSID (sysval QCCSID) from
65535
to say 37? How is data affected on the system?
You should read the appropriate documentation on this subject. IBM has
provided a number of resources to assist you in choosing the correct
value. See section 4.2.5 of the Road Map for Changing to PowerPC
Technology for considerations before changing QCCSID. Additional
information about QCCSID can be found in section 2.3.22 of the Work
Management Guide, section 3.1.1 of the National Language Support
manual, and many sections of the AS/400 International Application
Development manual. Much of this information is now in the Information
Centre under Globalisation. READ IT!
Existing data is not affected (i.e., no conversion process occurs).
Because no sites changed the QCCSID system value to something other
than 65535 when they should have back in VRM230 (possibly earlier) IBM
created a Job Default CCSID value to compensate. This value is derived
from your job's LANGID which in turn is inherited from the QLANGID
system value. This value is used when physical files are created so ...
... as long as your Job Default CCSID is 37 your data will probably be
in CCSID 37 too. If so there will be little or no effect on your
existing applications when you change QCCSID. However, you should not
do this blindly. If you do have files with data in a different CCSID
then behaviour may change and CCSID conversion from file CCSID to job
CCSID may now occur where it previously did not.
You should determine whether that change is safe for your environment
by evaluating your data files, your use of conversion functions such as
iconv, silly assumptions about EBCDIC/ASCII conversion, and other stuff
discussed in the references I gave above.
For most USA sites changing from 65535 to 37 will be painless but YOU
need to perform due diligence.
Regards,
Simon Coulter.
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