Hi,

In the admin center, you can remove all orphans binaries via an action (cf. screencap)

When you remove a blob from a document, only the link is destroyed between the Nx document and the binary. (e.g. http://localhost:8080/nuxeo/site/automation/doc?id=Blob.Remove on your local Nuxeo server)

Here is the code doing the job:

import org.nuxeo.ecm.core.storage.sql.management.RepositoryStatus;

RepositoryStatus status = new RepositoryStatus();
if (!status.isBinariesGCInProgress()) {
    status.gcBinaries(true);
}