oracle 关于等待事件“enq: RO - fast object reuse”

数据库版本oracle 11.2.0.4
现象:数据库在drop 、truncate 操作时出现大量“enq: RO - fast object reuse””等待事件,drop表耗时从0.0几秒增加到3-5分钟。
根据官方资料该等待事件属于 oracle bug 需要打补丁,根据官网查询需要打补丁,补丁下载地址https://support.oracle.com/epmos/faces/PatchResultsNDetails?_adf.ctrl-state=1b76ev1t45_332&releaseId=80112040&requestId=22229176&patchId=27734982&languageId=0&platformId=226&searchdata=%3Ccontext+type%3D%22BASIC%22+search%3D%22%26lt%3BSearch%26gt%3B%26lt%3BFilter+name%3D%26quot%3Bpatch_number%26quot%3B+op%3D%26quot%3Bis%26quot%3B+value%3D%26quot%3B27734982%26quot%3B%2F%26gt%3B%26lt%3B%2FSearch%26gt%3B%22%2F%3E&_afrLoop=524047172134969

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