This topic provides frequently asked questions (FAQs) and solutions for data governance in DataWorks.
Question categories
Data Map
Data Security Guard
Why are queries sometimes desensitized and sometimes not in Data Security Guard?
Why is there a large difference between the storage amount on the Data Map overview page and the storage trend chart?
The storage amount is a real-time value. The storage trend chart is a line chart that displays a snapshot from a specific point in time. A difference between these two values is expected if your current computing workload is low and generates few temporary tables.
Why can't I find a new table in Data Map?
If the table status in Data Map is inconsistent with its actual status, you can use the manual sync feature in Data Map to synchronize the latest table status. This applies to the following cases:
The table schema is not updated in Data Map.
A new table cannot be found in Data Map.
A new table cannot be found in data integration.
How do I notify downstream dependencies about business logic changes to a table?
You can use the section on the Data Map Table Details page to send batch email notifications to the owners of relevant downstream dependencies.
Which types of Hive tables support data preview in Data Map?
Data preview is supported only for specific types of Hive tables in E-MapReduce. If you cannot preview data from a Hive table, contact the cluster administrator to confirm that the cluster type and storage class meet the following requirements.
indicates that preview is supported. 
indicates that preview is not supported.
EMR cluster type | Metastore type | Data storage class: OSS | Data storage class: OSS-HDFS | Data storage class: HDFS |
Data Lake cluster (DataLake) | Data Lake Formation (DLF) |
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RDS instance |
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MySQL |
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Custom cluster (Custom) | Data Lake Formation (DLF) |
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RDS instance |
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MySQL |
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Other clusters | -- |
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Why are queries sometimes desensitized and sometimes not in Data Security Guard?
Desensitization is applied only when at least 80% of the data matches the specified rule.