394.Which of the following statements is true regarding the initialization parameter DIAGNOSTIC_DEST?
A. The default value is the value of the environment variable $ORACLE_HOME;
if $ORACLE_HOME isn't set,then the default is set to $ORACLE_BASE.
B. The default value is the value of the environment variable $ORACLE_BASE;
if $ORACLE_BASE isn't set,then it is set to $ORACLE_HOME.
C. DIAGNOSTIC_DEST is always equal to $ORACLE_HOME.
D. DIAGNOSTIC_DEST is always equal to $ORACLE_BASE.
Answer: B
题目解答
Automatic Diagnostic Repository (ADR)一个存放数据库诊断日志、跟踪文件的目录，
称作ADR base.
对应初始化参数DIAGNOSTIC_DEST.
如果设置了ORACLE_BASE环境变量，DIAGNOSTIC_DEST等于 ORACLE_BASE，
如果没有设置ORACLE_BASE，则等与ORACLE_HOME/log。
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