Oracle 11G OCP 1Z0-053 29

（29）Which two statements are true regarding the Automatic Diagnostic Repository(ADR) in Oracle Database 11g?(Choose two.)

A. A single ADR can support multiple ADR homes for different database instances.

B. The alert files are stored in XML file format in the TRACE directory of each ADR home.

C. If the environmental variable ORACLE_BASE is set,then DIAGNOSTIC_DEST is set to $ORACLE_BASE.

D.The BACKGROUND_DUMP_DEST initialization parameter overrides the DIAGNOSTIC_DEST initialization parameter for the location of the alert log file.

答案：（A、C）

解析：

參考《Concepts Concepts》  13.6.1.2

這個引數被Oracle 11g新引入的診斷架構所忽略,這個架構會將trace and core file放到由DIAGNOSTIC_DEST初始化引數所控制的位置上

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