I think C D.
The database, Oracle Automatic Storage Management (Oracle ASM), the listener, Oracle Clusterware, and other Oracle products or components store all diagnostic data in the ADR.
https://docs.oracle.com/database/121/ADMIN/diag.htm#ADMIN11260
A - false; default value for DIAGNOSTIC_DEST: If $ORACLE_BASE is not set, then derived from ORACLE_BASE as set by the Oracle Universal Installer. If ORACLE_BASE is not set, then $ORACLE_HOME/rdbms/log is used.
B - false; see answer A
C - true; Beginning with Oracle Database 11g and later releases, Oracle Automatic Storage Management (Oracle ASM), and other Oracle Database products or components store all diagnostic data in the ADR.
D - true; Review this content to understand clusterware-specific aspects of how Oracle Clusterware uses ADR.
E - false; data are not held inside an Oracle database schema
Sources:
A, B - Oracle documentation: 1.108 DIAGNOSTIC_DEST
C - Oracle documentation: 21.2 Definitions for Oracle Database ADRC
D - Oracle documentation: J Troubleshooting Oracle Clusterware
The correct answers are: A, E
If this parameter is omitted or left null, then the database sets DIAGNOSTIC_DEST upon startup as follows:
If environment variable ORACLE_BASE is set, then DIAGNOSTIC_DEST is set to the directory designated by ORACLE_BASE.
If environment variable ORACLE_BASE is not set, then DIAGNOSTIC_DEST is set to ORACLE_HOME/log
Following the url indicated by the correct answer of exam topic. We understand this is the same for Oracle 19
By exclusion:
A and B are wrong because the default path is ORACLE_HOME/log for this case:
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.
E is wrong because:
The Automatic Diagnostic Repository (ADR) is a directory structure that is stored outside of the database. It is therefore available for problem diagnosis when the database is down.
ref.
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/admin/managing-diagnostic-data.html#GUID-C78CCAD4-732B-4B14-9C6B-D47AC2A99E30
A, B - Wrong: The ADR root directory is known as the 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 SORACLE_BASE. If environment variable ORACLE_BASE is not set, DIAGNOSTIC_DEST is set to SORACLE_HOME/log.
C - Correct: For example, in an Oracle Real Application Clusters environment with Oracle ASM, each database instance, Oracle ASM instance, and listener has an ADR home.
D - Correct: Oracle Clusterware uses ADR and has its own Oracle home and Oracle base.
E - Wrong: The Automatic Diagnostic Repository (ADR) is a directory structure that is stored outside of the database. It is therefore available for problem diagnosis when the database is down.
From <https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/diagnosing-and-resolving-problems.html#GUID-951A06EE-DDF7-4C2A-B0BB-B24418BB2E33>
The ADR root directory is known as the 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 SORACLE_BASE.
If environment variable ORACLE_BASE is not set, DIAGNOSTIC_DEST iS set to SORACLE_HOME/log.
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