Remark 36.17.4. Let $X$ be a quasi-compact and quasi-separated scheme. Let $T \subset X$ be a closed subset such that $X \setminus T$ is quasi-compact. Let $G$ be a perfect object of $D_{\mathit{QCoh}, T}(\mathcal{O}_ X)$ which is a generator for $D_{\mathit{QCoh}, T}(\mathcal{O}_ X)$. By Lemma 36.15.4 there is at least one of these. Combining the fact that $D_{\mathit{QCoh}, T}(\mathcal{O}_ X)$ has direct sums with Lemma 36.17.3 and with Derived Categories, Proposition 13.37.6 we see that $G$ is a classical generator for $D_{perf, T}(\mathcal{O}_ X)$.

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