Adicionado capítulo sobre Migração de Banco Dados Relacionais #14
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Como a migração de banco de dados relacionais é uma possível etapa de um deploy em produção, criei este texto com a descrição de um processo seguro para aplicação de alterações sem resultar em tempo de indisponibilidade do software.
O conteúdo descrito é baseado em estudos (como citado Pramod Sadalage e Martin Fowler no artigo "Evolutionary Database Design") e vivência de mercado.