I would like to understand what OLTP is

They asked me this question: What is OLTP? I ran home, opened google and started to "goolgar", so I came across these codes, which are said to have problems in OLTP environments and I do not understand bullying:

public JsonResult ListarAlocacoes(AlocacaoView alocacaoView)
{
    var contratosAlocacaoList = ObterContratosAlocacao(alocacaoView);

    /* ... */
}

private IList<AlocacaoJson> ObterContratosAlocacao(AlocacaoView alocacaoView = null)
{
    var contratoList = BaseContext.DbContext.Set<Contrato>().Include("ContratoValores").ToList();

    foreach (var contrato in contratoList.Where( /* ... */ ))
    {
        var alocacao = MontarAlocacao(contrato, alocacaoView.CompetenciaId);

        /* ... */
    }

    /* ... */
}

private AlocacaoJson MontarAlocacao(Contrato contrato, DateTime dataCompetencia, int? equipeId = null)
{
    var alocacao = new AlocacaoJson();

    /* ... */

    alocacao.Equipe = ObterEquipeContrato(contrato, equipeId);
    alocacao.CustoTotal = ObterCustoTotalContrato(contrato, dataCompetencia);

    /* ... */
}

private EquipeJson ObterEquipeContrato(Contrato contrato, int? equipeId)
{
    var equipe = BaseContext.DbContext.Set<Equipe>().Find(equipeId.Value);

    /* ... */
}

private CustoTotalJson ObterCustoTotalContrato(Contrato contrato, DateTime dataCompetencia)
{
    var competencia = BaseContext.DbContext.Set<Competencia>().Where(c => c.Data == dataCompetencia).First(); ;
    var alocacao = BaseContext.DbContext.Set<Alocacao>().Include("AlocacoesProjeto").Include("Contrato").Include("Equipe").SingleOrDefault(c => c.CompetenciaData == competencia.Data);

    var valorHora = BaseContext.DbContext.Set<Funcao>().Find( /* ... */ ).ValoresHoras.SingleOrDefault( /* ... */ );

    var custoTotal = (decimal)(valorHora.Valor * alocacao.QtdeHoras) /* ... */;

    /* ... */
}

In a production environment would this stick to an OLTP approach? Why?