Dear Customer,

The job log is saved under /usr/sap/QSB/SYS/global/JOBLG.
In order to clean up the useless job log file under
/usr/sap/QSB/SYS/global/ JOBLG, you should schdule and run
housekeeping SAP standard job SAP_REORG_JOBS(program RSBTCDEL2) to
delete the useless job and the job log.

It is possible that there are some job logs are not for any job.  you
can refer to following sap notes, using RSTS0043 report to delete the
"orphaned" job logs.
#666290 Deleting "orphaned" job logs
#1272528 RSTS0043: All orphaned logs are not deleted
#1247412 RSTS0043: All job logs are recognized as incorrect
#1246731 RSTS0043: Some of the job logs are not recognized
#1411877 New standard jobs

At last, For job log, please refer to following wiki page:
http://wiki.scn.sap.com/wiki/x/PIkRG

For nnnBDCLG directory, please create a new incident to BC-ABA-SC
component.

Best regards,
Shi Feng
SAP Active Global Support
SCN WIKI/FORUM CONTRIBUTOR

#2118508 - What kind of incident belongs to BC-CCM-BTC component
https://service.sap.com/sap/support/notes/2118508

SAP Background Processing Troubleshooting Wiki Space:
http://wiki.scn.sap.com/wiki/display/SI/SAP+Background+Processing
(Typical Issue Troubleshooting Guide List, Frequent Question List, etc.)
     New SAP xSearch http://service.sap.com/xsearch
     One search, multiple knowledge base repositories - SDN, SAP Notes,
         Wikis, Blogs and many others.

Dear customer,

Please be informed that this incident has been forwarded to BC-CCM-BTC
component for further check.
My colleagues will update you shortly.

Best regards,
Taylor

Dear sap:
our dev,qas,and prd systems's global filesystem are full,
The nnnJOBLG and nnnBDCLG derectory are very large,
I want to delete those unnecessary files,But I don't know how to do
this,
I have read "note 16513 - File system full - what can you do?"，
but this note did not provide a detailed solution，please help
me,thanks.

Dear customer,

Please also provide some screenshots to show your issue.

Best regards,
Taylor

Dear customer,

Thank you for contacting SAP Product Support.
Seems that all the characters in problem description are garbled and I
could not know what the issue is.
Please kindly check.

Best regards,
Taylor