I am new to Koha, we installed KOHA 2.2.9 and working on this. But when we add data (entry) simultaneously 3-4 peoples, system becames very slow.Kindly send me also ISBD format for AACR-2 and for accession No for rerieval form. How we control/protect duplicate entry on KOHA. At what level we make provision for this. Thanking you Mange Ram Incharge Central Library DEI(Deemed Univ), Dayalbagh, Agra-5