SAP Buffers can be reset with below commands :

1.    /$SYNC        - Resets the buffers of the application server
2.    /$CUA          - Resets the CUA buffer of the application server
3.    /$TAB          - Resets the TABLE buffers of the application server
4.    /$NAM          - Resets the nametab buffer of the application server
5.    /$DYN        - Resets the screen buffer of the application server
6.    /$ESM          - Resets the Exp./ Imp. Shared Memory Buffer of the application server
7.    /$PXA          - Resets the Program (PXA) Buffer of the application server.

 **Please Note : Resetting of the buffers could change the performance of the entire system.