A string containing a comma-separated list of publications to check. An empty string (UL_SYNC_ALL macro) implies all tables
except tables marked as "no sync". A string containing just an asterisk (UL_SYNC_ALL_PUBS macro) implies all tables referred
to in any publication. Some tables may not be part of any publication and are not included if the pub-list string is "*".
Determines the maximum number of rows to count, thereby limiting the amount of time taken by the call. A threshold of
0 corresponds to no limit (that is, count all rows that need to be synchronized) and A threshold of 1 can be used to quickly
determine if any rows need to be synchronized.