Hi Ramesh,
This is not Database logs problem.
Check below tables and see how many entries are there both tables
So you need to schedule the report SBAL_DELETE in each client as a background because these table client dependent or
you can use SLG2 tcode as below sap note.
BALHDR is Application log: log header table
and
BALDAT is Application Log: Log data table
before and after deleting data you check these tables size and number of rows using DB02 txn.code.
SBAL_DELETE report will delete entry from both table,
195157 - Application log: Deletion of logs
Thanks
Siva