Some Useful Basis T-codes

SU01 - User maintainance

SU3 - Logged in User maintainance

SU10 - Mass user maintainace

SM04 - Shows list of logged in users with T-codes executed on a server

AL08 - Shows list of logged in users globally in all the instances which are active

SM02 - To send system messages

SM36 - To create Background jobs

SM37 - To monitor Background jobs

SMX - To view the status of Background jobs

RZ04 - To create Operation Modes

RZ03 - To switch Operation Modes

SM63 - To define Time table for Operation Modes

SM21 - System log. Log for all the transactions are captured here

SM22 - To view ABAP run-time errors

PFCG - Roles and Profile Maintainance

STMS - To configure Transport Management System

STMS_IMPORT - To import a Transport request

SM59 - To create RFC's

SM58 - To create transactional RFC

SM21 - To create Queued RFC

RZ10 - To create/edit any paramenter

RZ11 - To view individual parameter by name

SA38 - To view list of all the parameters

SE38 - ABAP editor screen

SE16 - To view table entries

SE93 - To create/edit any T-Code

SCC4 - To create Client

SCCL - Local Client Copy

SCC7 - Client Import

SCC8 - Client Export

SCC9 - Remote Client Copy

SCC5 - To delete a Client

SCC3 - To view Client copy logs

PFUD - Mass User comparison

SU56 - To display user context data

SU53 - To display user authorization data

SUIM - To view user change history

ST01 - System trace

ST02 - Memory tune summary

ST03 - Workload Monitor

ST05 - Performance analysis

ST06 - Operating System Monitoring

ST22 - Workprocesses Trace, Message Service Trace and Dispatcher Trace

SE06 - To view system change options

SE11 - ABAP dictionary

SE80 - Object Navigator

SCOT - To configure SMTP

SOST - To monitor External send messages

SBWP - Business Workplace

SPAM - Support Packages Manager

SAINT - To install add-ons or plugins

SM50 - Workprocesses overview

SM51 - List of SAP Servers

SPAD - To add a printer

SP01 - Spool requests are displayed

SP02 - Output requests are displayed

SM12 - To check lock entries

SM13 - To view update requests

SM28 - To check for any errors after install

SICK - To check for any errors after install

SLICENSE - To install a permanent license

SNAP - ABAP dumps are stored

SE01 - To create a transport request

SE09 - To create a change request

SE10 - To create a change request

RZ70 - To connect ABAP to SLD

RZ20 - CCMS Monitoring

RZ21 - CCMS Remote Monitoring

SGEN - Load Generator

SMSY - To generate Solution Manager Key