rsdb/min_blocking_factor is a SAP Parameter attribute which is used to control Min. split factor for FOR ALL ENTRIES queries information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter is only intended for internal use and must not be changed
without explicit instruction from SAP.
An internal table [itab] with entry data is always returned to an ABAP
SELECT query with the addition FOR ALL ENTRIES. If this parameter is set
to a value grater than "0" AND rsdb/prefer_fix_blocking is set to "1",
then two different blocking factors are used: A smaller factor
(min_blocking_factor) and a larger factor (max_blocking_factor).
However, the min_blocking_factor is only used if a few entries are found
in [itab]: Made simpler if "Entries([itab]) <(><<)> max_blocking_factor
/ 2" applies.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.