title: ROracle: dbGetQuery works but dbListTables and other functions do not
body: <p>I installed ROracle (following the <a href="https://cran.r-project.org/web/packages/ROracle/INSTALL" rel="nofollow">directions in the package</a>) and successfully connected to our Oracle database.</p>
  
  <p>I can run queries, using <code>dbGetQuery</code>, and get results just fine, e.g.:</p>
  
  <pre><code>&gt; dbGetQuery(con, "select count(*) from table_name")
    COUNT(*)
  1     6111
  </code></pre>
  
  <p>However, some of the other DBI/ROracle helper functions give no results:</p>
  
  <pre><code>&gt; dbListTables(con)
  character(0)
  
  &gt; dbReadTable(con, "table_name")
  Error in .oci.GetQuery(con, qry) : 
    ORA-00942: table or view does not exist
  </code></pre>
  
  <p>Any ideas what may be the cause?</p>