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did you verify the DB2INSTANCE is set WITHIN the scope of the crontab-script ? (or did you only check on the commandline ?)
i suggest to extend your script to check it out
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echo "DB2INSTANCE is: $DB2INSTANCE" > /tmp/db2_backup.log
home/db2inst3/sqllib/bin/db2 force applications all
/home/db2inst3/sqllib/bin/db2 backup db dia to '/data/arraya/bck'
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