cherrylzhao commented on issue #2362: {dataSource-1} inited takes a long time 
when use ORA12c
URL: 
https://github.com/apache/incubator-shardingsphere/issues/2362#issuecomment-493856436
 
 
   so I saw some tables don't contains "$", I think this is the reason. logic 
of loading metadata  is here
   ```
   try (Connection connection = connectionManager.getConnection(dataSourceName);
                ResultSet resultSet = 
connection.getMetaData().getTables(catalog, getCurrentSchemaName(connection), 
null, new String[]{"TABLE"})) {
               while (resultSet.next()) {
                   String tableName = resultSet.getString("TABLE_NAME");
                   if (!tableName.contains("$") && !tableName.contains("/")) {
                       result.add(tableName);
                   }
               }
           }
   ```
   
   you can write a JDBC test program like above to verify it.

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