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Oracle Patching Guide: CPU, RU, RUR, and 2026's New Monthly CSPU
Oracle's patching terminology has evolved: legacy CPU and PSU gave way to RU and RUR, with RUR deprecated in 2023. In 2026, Oracle added monthly Critical Security Patch Updates (CSPUs) alongside quarterly RUs. The article clarifies the current best practice: apply the latest RU quarterly and use MRP or CSPU for interim fixes.
Meridian48 take
The guide is a useful reference for DBAs, but the real story is Oracle's shift to monthly security patches — a response to rising vulnerability pressure that adds operational complexity.
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Oracle Patching, Demystified: CPU, RU, RUR — and What Changed in 2026 →
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