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Understanding audit data
Understanding audit data
When Object auditing is enabled for a particular type of object, any changes to objects of that type generate audit data in a few different tables.
TCHANGEOPERATION
A row is added to the TCHANGEOPERATION table each time a change occurs. TCHANGEOPERATION contains the following information:
| CHANGE_TYPE | The type of change (update, delete, etc.). |
|---|---|
| QUERY_PARAMETERS | The JPQL query parameters (in the case of a delete). |
| QUERY_STRING | The JPQL query that persisted the change (in the case of a delete). |
| ROOT_OBJECT_GUID | The GUID of the top-level object that was modified. |
| ROOT_OBJECT_NAME | The name (usually the fully-qualified class name) of the top-level object that was modified. |
| TYPE | Whether the change was part of a bulk operation or a single change. |
| CHANGE_TRANSACTION_UID | Foreign key on TCHANGETRANSACTION. |
TCHANGETRANSACTION
A row is added to the TCHANGETRANSACTION table each time a change occurs. It contains a timestamp indicating the date and time the change occurred.
TCHANGETRANSACTIONMETADATA
One or more rows are added to the TCHANGETRANSACTIONMETADATA table each time a change occurs. One row is added containing the GUID of the Change Sets that contains the modified object.
TDATACHANGED
For auditing purposes, the most useful information from a business perspective is in the TDATACHANGED table. Usually at least two rows are added each time a change occurs. Each row contains details about specific data that was changed during the operation. TDATACHANGED contains the following information:
| CHANGE_OPERATION_UID | Foreign key on TCHANGEOPERATION. |
|---|---|
| CHANGE_TYPE | The type of change (update, delete, etc.). |
| FIELD_NAME | The name of the field on the class containing the changed value. |
| FIELD_NEW_VALUE | The value of the field after the change. |
| FIELD_OLD_VALUE | The value of the field before the change. |
| OBJECT_GUID | The GUID of the object that was modified. If the object does not have a GUID, this column contains NULL. |
| OBJECT_NAME | The name (usually the fully-qualified class name) of the top-level object that was modified. |
For example, if a CM client user modifies the brand and the display name of a product object, the following information would be stored in TDATACHANGED.
In this case, the top-level object that was changed is a ProductImpl, but the displayName field is stored in a sub-object (LocaleDependantFieldsImpl).