053试题 102 - ORACLE ADR

题目：

102.Examine the following values of the initialization parameters in the database having the SID ORCL:
BACKGROUND_DUMP_DEST=/u01/app/oracle/product/11.1.0/db_1/bdump
USER_DUMP_DEST=/u01/app/oracle/product/11.1.0/db_1/udump
CORE_DUMP_DEST=/u01/app/oracle/product/11.1.0/db_1/cdump
DIAGNOSTIC_DEST=
The environment variables have the following value:
ORACLE_BASE=/u01/app/oracle
ORACLE_HOME=/u01/app/oracle/product/11.1.0/db_1
What is the location of the Automatic Diagnostic Repository (ADR) home?
A. /u01/app/oracle/product/11.1.0/db_1
B. /u01/app/oracle
C. $ORACLE_HOME/bdump
D. $ORACLE_HOME/log

参考答案 B
参考文档：

https://docs.oracle.com/cd/E11882_01/server.112/e25494/diag.htm#ADMIN11008

Structure, Contents, and Location of the Automatic Diagnostic Repository

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.

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.

ADR homes reside in ADR base subdirectories that are named according to the product or component type. Figure 9-1 illustrates these top-level subdirectories.

Figure 9-1 Product/Component Type Subdirectories in the ADR

Description of "Figure 9-1 Product/Component Type Subdirectories in the ADR"

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来源：https://blog.csdn.net/xxzhaobb/article/details/99694368