SAP basic transaction codes for ABAP, MM and SD

 The  following transaction codes are useful for Basis, ABAP, MM and SD modules.  The transaction code and its functions are: 

Transaction Code		Function
AL08	List of all Users Logged ON (about all Instances/Servers of the System)
DB01	Exclusive waits in Oracle database
DB02	Database performance ; tables and index
RZ10	Maintain system profiles
SA38	ABAP Reporting
SCC3	Client copy log
SCC4	Client copy administration
SCC5	Delete Clients
SCC6	Client import
SCC7	Client import--- post processing
SCC8	Client export
SCC9	Remote client copy
SCCL	Local client copy
SCDO	Change Document Object
SCMP	Table comparison
SCU3	Table History
SE06	Set up workbench organizer
SE09	Transport organizer
SE10	Customizing  organizer
SE11	Data dictionary maintenance`
SE12	Data dictionary display
SE15	Repository Info System
SE16	Display table content
SE17	General table display
SE37	ABAP Function Modules
SE38	ABAP Editor
SE41	Menu Painter
SE51	Screen Painter
SE71	Form Painter
SE80	Object Navigator
SE93	Maintain Transaction
SFT2	Maintain public holiday calendar
SFT3	Maintain factory calendar
SHDB	Transaction Recorder
SICK	Installation check
SM01	Lock Transactions
SM04	Overview of users
SM13	Update terminates
SM21	System Log
SM30	Maintain tables(not all tables can use SM30)
SM31	Maintain tables
SM59	RFC connection, maintain
SM63	Operations mode, maintain
SM66	Global work process overview
SM69	External operating system commands, maintain
SPAM	SAP Patch Manager
SPAU	Intersection SAP Transport/customer modifications
ST06	Operating system monitor
ST07	Application Monitor
ST09	Table call statistics
ST11	Display developer trace
ST12	Application monitor
SU01	User maintenance
SU02	Maintain authorization profiles
SU03	Maintain authorizations
SU10	Maintain change to user records
SU12	Delete all users
SU2	Maintain user parameters
SU53	Display authorization checked values
SM12	To unlock the locked entries
SE30	ABAP runtime analysis(Performance tuning)
SE61	SAP Documentation
SE63	Translation: Initial Screen ( to Translate Short / Long Text )
SE64	Terminology
smartforms	Smartforms