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Which two statements are true regarding the Automatic Diagnostic Repository (ADR) in Oracle Database 11g? (Choose two.)
Correct Answer: A,C
Explanation/Reference: Explanation: The ADR root directory is known as ADR base. Its location is set by the DIAGNOSTIC_DEST initialization parameter. If this parameter is omitted or left null, the database sets DIAGNOSTIC_DEST upon startup as follows: If environment variable ORACLE_BASE is set, DIAGNOSTIC_DEST is set to the directory designated by ORACLE_BASE. If environment variable ORACLE_BASE is not set, DIAGNOSTIC_DEST is set to ORACLE_HOME/log Within ADR base, there can be multiple ADR homes, where each ADR home is the root directory for all diagnostic data-traces, dumps, the alert log, and so on-for a particular instance of a particular Oracle product or component. For example, in an Oracle Real Application Clusters environment with Oracle ASM, each database instance, Oracle ASM instance, and listener has an ADR home.