DIAGNOSTIC_DEST

Thank you for visiting Spatial DBA - Oracle and ArcSDE.

Please visit Oracle DBA Tips (http://www.oracledbatips.com) for more Oracle DBA Tips.
==================================================================

Property	Description
Parameter type	String
Syntax	DIAGNOSTIC_DEST = { pathname | directory }
Default value	Derived from the value of ORACLE_BASE ($ORACLE_BASE). If the $ORACLE_BASE environment variable does not exist, then $ORACLE_HOME is used.
Modifiable	ALTER SYSTEM
Basic	No
Real Application Clusters	This parameter can be set on each instance. Oracle recommends that each instance in a cluster specify a DIAGNOSTIC_DEST directory location that is located on shared disk and that the same value for DIAGNOSTIC_DEST be specified for each instance.

As of Oracle Database 11g Release 1, the diagnostics for each database instance are located in a dedicated directory, which can be specified through the DIAGNOSTIC_DEST initialization parameter. The structure of the directory specified by DIAGNOSTIC_DEST is as follows:

<diagnostic_dest>/diag/rdbms/<dbname>/<instname>

This location is known as the Automatic Diagnostic Repository (ADR) Home. For example, if the database name is proddb and the instance name is proddb1, the ADR home directory would be /diag/rdbms/proddb/proddb1.
The following files are located under the ADR home directory:

· Trace files - located in subdirectory /trace

· Alert logs - located in subdirectory /alert. In addition, the alert.log file is now in XML format, which conforms to the Oracle ARB logging standard.

· Core files - located in the subdirectory /cdumd

· Incident files - the occurrence of each serious error (for example, ORA-600, ORA-1578, ORA-7445) causes an incident to be created. Each incident is assigned an ID and dumping for each incident (error stack, call stack, block dumps, and so on) is stored in its own file, separated from process trace files. Incident dump files are located in /incident/. You can find the incident dump file location inside the process trace file.

Note:
1. This parameter was introduced in 11g.
2. Finding alert.log file in 11g, see Metalink note 438148.1
3. Query for the current value of the parameter

select name, value, isdefault, isses_modifiable, issys_modifiable,

isinstance_modifiable, isdeprecated, description

from v$parameter where upper(name) = ‘DIAGNOSTIC_DEST’;

Oracle initializatoin parameters