Oracle patch也即是Oracle補丁。Oracle補丁又包含好幾個種類，小的補丁簡直是難以數計，難免讓人眼花繚亂。盡管如此，Oracle patch還是有序可循的。而且Oracle提供的opatch工具非常方便的用于安裝oracle patch，以及查看當前系統已經安裝的patch。本文列出了patch的幾種類型，以及主要描述通過opatch工具查看當前數據庫的patch應用的情況。對于如何apply patch可參考Oracle官方文檔。
1、Oracle patch類型
Critical Patch Update (CPU)
Bundled patches (For Windows and Exadata only)
PSR(Patch Set Release)/Patch Set Update(PSU)
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