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12c Default Values Shown Incorrectly (Doc ID 2109390.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

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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In this Document
Symptoms
Cause
Solution
References

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