Modify listener port

Posted on 2015-01-27
Last Modified: 2015-02-11
Task: to identify from where all the connections are coming or better to say, who is coming from where?

Reason: Planning to change the database listening port, earlier it was 1521, the default, but making it 1540

Please advise/share what are our best options, thinking of looking into listener.log and extracting all the HOST=<ip address>.

Please do update/reply, if any guru has any better solution to find all the hosts from where connections are coming.

Thanks in advnace.
Question by:mkhandba
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LVL 74

Accepted Solution

sdstuber earned 500 total points
ID: 40572933
turn on auditing for your connections  and look at the userhost column of dba_audit_trail
audit create session;

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an advantage of going to the listener log though is that your can also find attempted but failed connections.  The database audit trail will only capture activity that actually made it to the db.

Author Comment

ID: 40572990
thanks sdstuber, but can you please share how to accomplish it, how to enable this auditing or either can direct me to any link/doc, from where I can get something step by step.

thanks again for your quick response :)
LVL 74

Expert Comment

ID: 40573025
the code block in the original post  shows how to do it.

audit create session;  --  just those 3 words

it's very possible your dba had auditing already turned on, in which case you can simply query the view without doing anything.

then any time someone logs on a record will be created in dba_audit_trail.

then you simply query that view.

select * from dba_audit_trail.

make sure your init parameter audit_trail is set to write to the DB

select value from v$parameter where name = 'audit_trail';

you want either DB or DB, EXTENDED
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Author Comment

ID: 40573341
it's OS ... :( now what to do?
LVL 74

Expert Comment

ID: 40573380
OS means the audit records are written to files outside of the database.  So you can't simply use sql to read the data.

you can still read the files, and try to parse out the userhost values from the file,  it'll be a similar effort to what you're doing with listener logs

use this query to find where the audit files are written

select value from v$parameter where name = 'audit_file_dest';

Author Comment

ID: 40574230
yes sdstuber already got the location, but now the same task, how to extract the host info from those log files ... will you be able to assist here?
LVL 74

Expert Comment

ID: 40575100
try something like this

 awk '{for (i=1;i<=NF;i++) {if ($i == "USERHOST:") {print $(i+1)}}}'  your_audit_file_here.aud

it is important to note that Oracle doesn't document the file format of the OS audit files and has changed the format between versions, so what works now may not work in the future and may not work on older versions.  

If you want more consistent content then you might need to switch to XML format, or not use external files, but instead use DB and then you can use the dba_audit_trail as shown above

Author Comment

ID: 40582471
this didn't work, I've submitted another question over here, how to find, trying that ...

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