Mongo DB name max length

[jorgeeflorez]

Hi all, I hope you are all doing well...

According to the documentation
<https://docs.mongodb.com/v3.6/reference/limits/>, in MongoDB I can create
a database whose name is up to 64 characters. When I try to connect to a
repository (Oak 1.12.0) that does not exist and use a db name with 64
characters I am getting:

Exception in thread "main" com.mongodb.MongoCommandException: Command
failed with error 73 (InvalidNamespace): 'Invalid database name:
'repository123456789012345678901234567890123456789012345678901234'' on
server 192.168.200.1:37017. The full response is { "ok" : 0.0, "errmsg" :
"Invalid database name:
'repository123456789012345678901234567890123456789012345678901234'", "code"
: 73, "codeName" : "InvalidNamespace" }

After some debugging, I found out that the driver appends .$cmd to the
database name, and with that, exceeds the 64 limit. If I use a db name with
63 it appears to work.

My test class has the following :

    public static void main(String[] args) throws RepositoryException {
        String repositoryName =
"repository123456789012345678901234567890123456789012345678901234";
        OakFileDataStore fileDataStore = new OakFileDataStore();
        fileDataStore.setMinRecordLength(0);
        File repositoryFolder = new File("E:\\repos", repositoryName);
        fileDataStore.init(repositoryFolder.getAbsolutePath());

        DataStoreBlobStore dsbs = new DataStoreBlobStore(fileDataStore);

        MongoDocumentNodeStoreBuilder builder = new
MongoDocumentNodeStoreBuilder().
                setMongoDB("mongodb://forest:forest@192.168.200.1:37017",
repositoryName, 16).
                setClusterId(123456).
                setAsyncDelay(1000).
                setBlobStore(dsbs);

        DocumentNodeStore docStore = builder.build();

        Oak oak = new Oak(docStore);

        LuceneIndexProvider luceneProvider = new LuceneIndexProvider();

        Jcr jcr = new Jcr(oak)
                .with(new LuceneIndexEditorProvider())
                .with((QueryIndexProvider) luceneProvider)
                .with((Observer) luceneProvider)
                .withAsyncIndexing();


        Repository repository = jcr.createRepository();
        RepositoryImpl repImpl = (RepositoryImpl) repository;
        Session session = null;
        try {
            session = repImpl.login(new SimpleCredentials("admin",
"admin".toCharArray()), null, new HashMap<String, Object>());

            Node root = session.getRootNode();
            System.out.println(root.getPath());
        }
        finally {
            if(session != null) {
                session.logout();
            }

            repImpl.shutdown();
            docStore.dispose();
        }
    }

My question is: is there another way to "create" the database having 64
characters? or should I establish 63 (or maybe less) as the limit for db
names?

Thanks.

Regards.

Jorge Flórez