Usually db2look ignores the DB2 internal objects as it can recreate back those objects on it's own. The user defined objects are more important to extract as DB2 don't have any knowledge about how to regenerate those back otherwise. SYSTOOLS schema have mostly system defined objects. So db2look will ignore all objects under SYSTOOLS schema except user-defined functions and stored procedures. Also, from source level to destination level the internal objects might have minor differences. ...
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Tags: 
db2look
systools
stmg_dbsize_info
db2