For a Dirichlet series g, we study the Volterra operator Tgf(s)=-∫s+∞f(w)g′(w)dw,\documentclass[12pt]{minimal}
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\begin{document}$$T_g f(s)=-\int ^{+\infty }_{s} f(w)g'(w)dw,$$\end{document} acting on a class of weighted Hilbert spaces Hw2\documentclass[12pt]{minimal}
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\begin{document}$${{\mathcal {H}}^{2}_{w}}$$\end{document} of Dirichlet series. We obtain sufficient / necessary conditions for Tg\documentclass[12pt]{minimal}
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\begin{document}$$T_g$$\end{document} to be bounded (resp. compact), involving BMO and Bloch type spaces on some half-plane. We also investigate the membership of Tg\documentclass[12pt]{minimal}
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\begin{document}$$T_g$$\end{document} in Schatten classes. Moreover, we show that if Tg\documentclass[12pt]{minimal}
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\begin{document}$$T_g$$\end{document} is bounded, then g is in Hwp\documentclass[12pt]{minimal}
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\begin{document}$${{\mathcal {H}}}^p_w$$\end{document}, the Lp\documentclass[12pt]{minimal}
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\begin{document}$$L^p$$\end{document}-version of Hw2\documentclass[12pt]{minimal}
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\begin{document}$${{\mathcal {H}}^{2}_{w}}$$\end{document}, for every 0<p<∞\documentclass[12pt]{minimal}
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\begin{document}$$0<p<\infty $$\end{document}. We also relate the boundedness of Tg\documentclass[12pt]{minimal}
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\begin{document}$$T_g$$\end{document} to the boundedness of a multiplicative Hankel form of symbol g, and the membership of g in the dual of Hw1\documentclass[12pt]{minimal}
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\begin{document}$${{\mathcal {H}}}^1_w$$\end{document}.
