Today, we we were doing database upgrade from 11.2.0.4 to 19c. 19c binaries installation was clean, while upgrade 107 phases was clean to until we got error during datapatch. Let me provide the error reported – Database connect failed with: ORA-12547: TNS:lost contact (DBD ERROR: OCIServerAttach) ISSUE Error: prereq checks failed! is known issue when…
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