12c Default Values Shown Incorrectly (Doc ID 2109390.1)

Last updated on AUGUST 09, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.
***Checked for relevance on 09-Aug-2017***

Symptoms

1. The default value for some of the initialization parameters is different between what the database shows and what 12c documentation says.

For example, according below documentation, the default value for deferred_segment_creation is false.
http://docs.oracle.com/database/121/REFRN/toc.htm
Oracle Database Reference, 12c Release 1 (12.1)
E41527-20

However, when checked in database, it shows the value as TRUE :

 

2. Also, some of the parameters show a differce between v$system_parameter.value and v$system_parameter.default_value even when the v$system_parameter.isdefault column is TRUE.

NAME VALUE DEFAULT_VALUE ISDEFAULT
------------------------------ -------------------------------- -------------------------------- ---------
max_string_size STANDARD NULL TRUE
db_block_checking FALSE NULL TRUE
db_block_checksum TYPICAL NULL TRUE
parallel_io_cap_enabled FALSE TRUE TRUE

 

Cause

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