| Oracle® Database Reference 11g Release 1 (11.1) Part Number B28320-01  | 
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DBA_REGISTRY_HISTORY provides information about upgrades, downgrades, and critical patch updates that have been performed on the database.
| Column | Datatype | NULL | Description | 
|---|---|---|---|
ACTION_TIME | 
TIMESTAMP(6) | 
The time the upgrade, downgrade, or patch action was completed | |
ACTION | 
VARCHAR2(30) | 
The specific action (for example, UPGRADE or DOWNGRADE) | |
NAMESPACE | 
VARCHAR2(30) | 
The namespace of the components affected (for example, SERVER) | |
VERSION | 
VARCHAR2(30) | 
The version number of the server (for example, 10.2.0.1.0) | |
ID | 
NUMBER | 
The identification number of the Critical Patch Update | |
COMMENTS | 
VARCHAR2(255) | 
Additional comments about the action taken |