Query para deletar as contas criadas no site que nunca logaram no servidor, recomendo utilizar a cada 3 meses.

DECLARE @Acc varchar(10), @Chars varchar(10), @test int
select @test = 0
DECLARE LISTA CURSOR LOCAL FOR
SELECT memb___id FROM MEMB_INFO
OPEN LISTA
FETCH NEXT FROM LISTA INTO @Acc
WHILE @@FETCH_STATUS = 0
begin
if (SELECT COUNT(*) FROM Character where AccountID=@Acc) = 0
begin
DELETE from MEMB_INFO where memb___id=@Acc
DELETE from VI_CURR_INFO where memb___id=@Acc
select @test = @test + 1
end

FETCH NEXT FROM LISTA INTO @Acc
end
CLOSE LISTA
DEALLOCATE LISTA
print @test
Lembrando claro de fazer backup antes de executar a query, para caso ocorra um problema vc não perder os dados.

Créditos: Alex Lima