How to tune buffers in sap?

Execute  the tcode ST02 to check the buffer utilized by the SAP system. Check for the hit ration and swap memory column. The hit ratio should be more than 98% and swap memory should not have been used, if used little bit. If more swap memory has been used, check for the which Buffer the swap memory has been used, double click it on the specified buffer

Click on the current parameters for the buffer selected by you. This will display the parameters to be tuned for the specified buffer. Increase the value through RZ10 (Profile Maintenance). After increasing the size restart the server.