dbs/ora/use_hints is a SAP Parameter attribute which is used to control Generierung von Optimizer Hints bei Oracle 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 .
The parameter determines whether hints for the cost-based optimizer are
generated for certain types of SQL statement.
Parameter value 0 means that no optimizer hints are generated. Hints are
usually generated for other values. The values '1' / '-1' activate hints
according to standard parameterization. You can also specify in detail,
as a parameter, when one of the supported hints is to be generated or
passed to the database.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.