SSSD cache credential's location

[seojeong kim]

/var/lib/sss/db/

I try to use SSSD offline authentication. 
under /var/lib/sss/db/
   cache_mydomain.ldb 
   ccache_mydomain.ldb 
   config.ldb
   fast_ccache_mydomain.ldb 
   sssd.ldb
   timestamps_mydomain.ldb

SSSD offline authentication works with the cached credential and credential will be stored after the  last successful login. 
How can I  check if SSSD credential cached properly after the successful login?  
Which file should I check ?