Extracting Watermarks

Prerequisites

• Access to cloud assets has been authorized. For details, see Allowing or Disallowing Access to Cloud Assets.

• An RDS or GaussDB(DWS) database has been authorized. For details, see Authorizing Access to a Database Asset.
• An MRS database has been authorized. For details, see Authorizing Access to Big Data Assets.
• You have configured the GaussDB(DWS) and MRS_Hive permissions. For details, see Configuring GaussDB(DWS) and MRS Hive.

Constraints

• The source file must be in CSV format and cannot be larger than 20 MB.
• The table may contain more than 1,500 rows of data.
• The CSV file content is encoded in UTF-8 mode. Ensure that the data is complete and correct.

Creating a Task

1. Log in to the management console.
2. Click in the upper left corner and select a region or project.
3. In the navigation pane on the left, click and choose Security & Compliance > Data Security Center.
4. In the navigation pane, choose Data privacy protection > Database Watermark.
5. Click the Extract Watermark tab.
6. Click Create Task. In the displayed dialog box, set parameters based on Table 1.
   Figure 1 Creating an extraction task
   

   Table 1 Creating a watermark extraction task

   Parameter	Description
   Task Name	Enter a task name.
   Source Files	The source file must be in CSV format and cannot be larger than 20 MB. The table may contain more than 1,500 rows of data. The CSV file content is encoded in UTF-8 mode. Ensure that the data is complete and correct.
   Extraction Mode	Select a watermark extraction mode from the drop-down list box. For lossy column embedding and lossless column embedding, extract watermarks by column. For lossless line embedding, extract watermarks by row.
   Delimiter	Delimiters in a file. For example: comma (,)

7. Click OK.

Viewing Results

1. Log in to the management console.
2. Click in the upper left corner and select a region or project.
3. In the navigation pane on the left, click and choose Security & Compliance > Data Security Center.
4. In the navigation pane, choose Data privacy protection > Database Watermark.
5. Click the Extract Watermark tab.
6. Locate a task and click View Result in the Operation column.

Deleting a Watermark Extraction Task

Watermark extraction tasks that are being executed cannot be deleted.

1. Log in to the management console.
2. Click in the upper left corner and select a region or project.
3. In the navigation pane on the left, click and choose Security & Compliance > Data Security Center.
4. In the navigation pane, choose Data privacy protection > Database Watermark.
5. Click the Extract Watermark tab.
6. Click Delete in the Operation column of the target task. You can also select multiple tasks and click Batch Delete to delete them.
   

   The deletion cannot be undone.