In the following table you will see the reference list of useful transaction codes for mostly used in SAP Basis related to security administration.
| Tcodes | Description |
SCC4 | Set Changeability of Clients |
SE03 | Set System Changeability |
SM01 | Lock Transactions |
SM18 | Delete Security Audit Log Files |
SM19 | Configure Security Audit Log |
SM20 | Analyze Security Audit Log (Global) |