This page lists known issues with Cloud DLP, along with ways you can avoid or recover from these issues.
Tables larger than 1 terabyte may cause quota issues
DlpJobs scanning tables larger than 1 terabyte are exhausting
TableDataService.List quota from BigQuery and may harm other
workflows, including Dataflow, running concurrently with the
Save findings to BigQuery does not populate row_number
field with the generated BigQuery table is inferred at the time the
table was scanned. Its value is nondeterministic, cannot be queried, and may be
null for inspection jobs.
If you need to identify specific rows where findings are present, specify
inspectJob.storageConfig.bigQueryOptions.identifyingFields at job creation
Identifying fields can be found in the generated BigQuery table under