SQL Dev 2.1 - Performance Problem Filtering Users

Question

Hi, we commonly want to apply a filter to our "Other Users" section in the connection window. We usually use where object count > 0 or >= 1. It appears to result in a query that looks like this:
<pre>
SELECT *
FROM (SELECT username
FROM sys.all_users au
WHERE au.username != USER)
WHERE (SELECT COUNT (1)
FROM all_objects
WHERE username = owner) >=1
</pre>
On our system, it is running for well over 3 minutes (sometimes 20 minutes). We have 2,400 rows in ALL_USERS and ALL_OBJECTS has 226,271 rows. The same roughly the same for DBA_* views as well.
Could the query that is generated be rewritten to be more like this?
<pre>
select *
from
(select username
from sys.all_users au
where au.username != USER)
where
username in (select owner
from all_objects
group by owner
having count(*) > 1)
</pre>
That query runs in less than 10 seconds on the same system and appears to be safe for any older versions of Oracle as well.
I realize that many systems don't have that many objects so maybe this is helpful feedback...

Answer 1

Yes - the SQL for these internal queries are located in XML files, which you can modify - although, this means you are accepting the risks and consequences of getting it wrong. The XML file you want is oracle\dbtools\raptor\navigator\oracle\schema.xml which is in <SQL Developer Home>\sqldeveloper\extensions\oracle.sqldeveloper.jar (you need to extract it from the jar, modify it and then put it back in the jar). Unfortunately, I don't know enough about the structure of the filter components of the XML to know if you can get a filter that does the query you want.
theFurryOne