The COMMON block relates to general settings:
USE_LINKDB = (value range 0 or 1)
For large amounts of data, you have the option to manage the replacement files in a separate table "REPLACE_TABLE". This is activated with "1". The replacement files are either taken from the configuration file or the REPLACE_TABLE.
See also Section 1.6.3.2.1.3, “Own replacement table "REPLACE_TABLE" ”" Section 1.6.3.2.1.3, “Own replacement table "REPLACE_TABLE" ”.
In the COMMON(Role1) block, the feature can only be activated for certain roles or users. You can create as many role-specific blocks as you like.