It is highly advisable to increase the next extend´s  size of some tables and their indexes even before initial loadings

FI       BKPF, BSEG, BSIS, BSAD, BSAK, BSID and BSIK

CO     COEJ, COEP, COKS, COSS and T811*

AM     ANL*

MM     MKPF, MSEG and BSIM

SD       VBAP, VBAK, VBEP, VBPA, LIKP, LIPS, VBRK, VBRP, VBKD, VBUK, VBUP and  VBSS

PP       RESB and MDTB

Accross module
ATAB, TST03, TSP01, MCSI, KNVP, ACCTIT, COEP, APQD, RFBLG, CDCLS,  SDBAD and from S000 to S999

Introduction
Introduction To SAP

SAP Books :-
SAP FI, CO, MM, PP, SD, PM, PS, QM, SM, HR, WF, BW, APO, Basis,  ABAP/4, Certification, Books

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips