Sapinst.log - Specifies the installation success / failure
Sapinst_dev.log - also provides similar log in case of installation is aborted
.tsk file specifies the table/ index etc that needs to be created on the DB.
Each task is commanded by .cmd file and during the process they writes into .log file
Sapappl0.str - Structure of the DB
Keydb.xml -Helps to restart installation from the point where it is failed.