HDP Sandbox: New tables and databases not visible in DAS UI

@jhc 

I have downloaded a HDP 3.0 sandbox to try get aroung your problem. After suceesful deployment on Virtual box When you access DAS the default user is hive see screenshot DAS default user and on the beeline too

[root@sandbox-hdp ~]# su - hive
Last login: Sat Sep 21 08:07:40 UTC 2019
[hive@sandbox-hdp ~]$ hive
Connecting to jdbc:hive2://sandbox-hdp.hortonworks.com:2181/default;password=hive;serviceDiscoveryMode=zooKeeper;user=hive;zooKeeperNamespace=hiveserver2
19/09/21 08:38:06 [main]: INFO jdbc.HiveConnection: Connected to sandbox-hdp.hortonworks.com:10000
Connected to: Apache Hive (version 3.1.0.3.0.1.0-187)
Driver: Hive JDBC (version 3.1.0.3.0.1.0-187)
Transaction isolation: TRANSACTION_REPEATABLE_READ
Beeline version 3.1.0.3.0.1.0-187 by Apache Hive
0: jdbc:hive2://sandbox-hdp.hortonworks.com:2> show databases;
INFO : Completed executing command(queryId=hive_20190921083816_c231488f-8a6f-4fb1-bdfb-48493a3cb98e); Time taken: 0.064 seconds
INFO : OK
+--------------------------+
| database_name            |
+--------------------------+
| default                               |
| foodmart                         |
| information_schema |
| sys                                       |
+-------------------------+
4 rows selected (0.443 seconds)

Now to demonstrate I will create a new database  JHC using DAS as the default user hive [See Create DB with DAS],

 You will see warning waiting for the database to be created it should succeed and now it should be available in the drop-down list see   [JHC database]

 Now choose this database to populate it with tables sample table Cloudera [see create_table_cloudera]

The DAS view should update with the table  [cloudera ] in [ jhc] database

While the beeline also proves the successful creation of the database and table therein

0: jdbc:hive2://sandbox-hdp.hortonworks.com:2> show databases;  
INFO : OK
+-------------------------+
| database_name            |
+-------------------------+
| default                               |
| foodmart                          |
| information_schema |
| jhc                                        |
| sys                                       |
+---------------------+
5 rows selected (0.092 seconds)
0: jdbc:hive2://sandbox-hdp.hortonworks.com:2> use jhc;
0: jdbc:hive2://sandbox-hdp.hortonworks.com:2> show tables;
+-----------+
| tab_name |
+-----------+
| cloudera |
+-----------+
0: jdbc:hive2://sandbox-hdp.hortonworks.com:2> describe cloudera;
INFO : OK
+-------------+-------------+------------+
| col_name    | data_type | comment |
+-------------+-------------+------------+
| id                    | tinyint        |                        |
| username | tinyint         |                        |
| position     | tinyint         |                        |
| dept             | tinyint        |                         |
+------------+-------------+-------------+
4 rows selected (0.173 seconds)

DAS view now shows the new table Cloudera in JHC database. Now getting back to your question  "When you query the databases the table doesn't appear in the drop-down list " Are you sure you selected the same DB where you created the table?"
I realized I had to wait for the refresh maybe you should manually refresh 🙂

Hope that helps, please revert