THE ADR ROOT DIRECTORY (ALSO KNOWN AS THE ADR BASE) IS SET BY THE PARAMETER DIAGNOSTIC_DEST

6. þ D. The ADR root directory (also known as the ADR base) is set by the

parameter DIAGNOSTIC_DEST. If it is not set, Oracle sets DIAGNOSTIC_

DEST to the environment variable ORACLE_BASE. If ORACLE_BASE is not

set, then the ADR root directory is set to $ORACLE_HOME/log.

ý A, B, and C. All three locations are not assigned, given the values of

DIAGNOSTIC_DEST, ORACLE_BASE, and ORACLE_HOME.