dbs/db4/alternate_qaqqinilib is a SAP Parameter attribute which is used to control Library that contains alternate QAQQINI file 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 .
See SAP Note 485420 for details and documentation. For SAP NW BI also
see SAP note 501572.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.