OCP-1Z0-053-V12.02-102题

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
Answer: B
答案解析：

如果ORACLE_BASE环境变量已设置，则DIAGNOSTIC_DEST被设置为$ORACLE_BASE

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

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.