Monday, November 15, 2010

scp, ssh, and rsync no prompting solution

Source host: oratest-sg29
Destination host: oradev01

1. On oratest-sg29, run this command as scpuser or whoever runs the scp in shell script.
$ ssh-keygen -t rsa
Press enter, then it will generate a public key and a private key.
Don’t share the private key.
The public key should have been saved on
/.ssh/id_rsa.pub
=====sample output=======
[oradev03 2] [portald] ~ > ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/export/home/oracle/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /export/home/oracle/.ssh/id_rsa.
Your public key has been saved in /export/home/oracle/.ssh/id_rsa.pub.
The key fingerprint is:
58:07:9d:ae:69:48:b3:8b:2a:65:2b:3a:8f:ff:ea:80 oracle@oradev03
[15:18:57]
[oradev03 3] [portald] ~ >


2. Scp id_rsa.pub from source/oratest-sg29 to destination/oradev01.


3. On destination server, login as the remote user which you plan to use scp.


4. Copy the contents of id_rsa.pub to ~/.ssh/authorized_keys
===========sample============
$ cat id_rsa.pub >>~/.ssh/authorized_keys
$ chmod 700 ~/.ssh/authorized_keys


5. Done. Enjoy the no prompt scp!

Monday, November 8, 2010

How External Table Works in StandBy Database

Standby database/Data Guard is highly used for reporting purposes. However, when you want to write some log data for your reporting purpose, you might encounter an issue that you are not allowed to do so on the standby instance.

In this case, using External Table is an option. You can create a stored procedure and use it to write os file for the external table.

Here is a sample code.

PROCEDURE wrt_transaction_log (p_job_id IN NUMBER,
p_programname IN VARCHAR2,
p_filename IN VARCHAR2,
p_full IN VARCHAR2,
p_feedstartts IN DATE,
p_feedendts IN DATE,
p_status IN VARCHAR2,
p_message IN VARCHAR2)
IS
v_output_file UTL_FILE.file_type;
filename VARCHAR2 (100);
v_string VARCHAR2 (2000);
nodata EXCEPTION;
BEGIN
EXECUTE IMMEDIATE ('ALTER SESSION SET NLS_DATE_FORMAT = ''YYYY-MM-DD HH24:MI:SS''');

filename := 'at_genpdfile_pkg_log_ext.txt';
v_output_file := UTL_FILE.fopen ('XTABLES', filename, 'A');

v_string :=
at_genpdfile_pkg_log_seq.NEXTVAL
|| '|'
|| p_job_id
|| '|'
|| USER
|| '|'
|| p_programname
|| '|'
|| p_filename
|| '|'
|| p_full
|| '|'
|| p_feedstartts
|| '|'
|| p_feedendts
|| '|'
|| p_status
|| '|'
|| p_message
|| '|'
|| SYSDATE;
UTL_FILE.put_line (v_output_file, v_string);
UTL_FILE.fclose_all;
END;

Thursday, November 4, 2010

How To Configure APEX Not To Prompt For User/Password

When I installed APEX for our clinical research using EPG, we got prompted to enter anonymous username password everytime. Try google...no luck. Oracle support just refuse my ticket because they just don't support 10gR2 using EPG....so I have to figure it out by my own in meta link.

Here is the solution:

If anonymous access to XML DB repository data via HTTP is not required, then you do not have to perform this step.

If anonymous access to XML DB repository data via HTTP is required, then you must provide correct configuration information, as described in this section. The administrator must carefully consider whether anonymous access is to be allowed, given the inherent security risks.

If you wish to have anonymous access to XML DB repository data via HTTP, you must change the XML DB configuration file (located at /xdbconfig.xml in the repository) by adding an additional element "allow-repository-anonymous-access" and set this new element to true, in addition to unlocking the ANONYMOUS user account.



connect sys/password@tns_alias AS SYSDBA

-- enable anonymous access to XDB repository

SET SERVEROUTPUT ON
DECLARE
l_cfgxml XMLTYPE;
l_value VARCHAR2(5) := 'true'; -- (true/false)
BEGIN
l_cfgxml := DBMS_XDB.cfg_get();

IF l_cfgxml.existsNode('/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access') = 0 THEN
-- Add missing element.
SELECT insertChildXML
(
l_cfgxml,
'/xdbconfig/sysconfig/protocolconfig/httpconfig',
'allow-repository-anonymous-access',
XMLType('' ||
l_value ||
'
'),
'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"'
)
INTO l_cfgxml
FROM dual;

DBMS_OUTPUT.put_line('Element inserted.');
ELSE
-- Update existing element.
SELECT updateXML
(
DBMS_XDB.cfg_get(),
'/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access/text()',
l_value,
'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"'
)
INTO l_cfgxml
FROM dual;

DBMS_OUTPUT.put_line('Element updated.');
END IF;

DBMS_XDB.cfg_update(l_cfgxml);
DBMS_XDB.cfg_refresh;
END;
/




Once the "" element is set to "true", anonymous access to the XML DB repository, but not web services, is enabled by unlocking the anonymous database account.



connect sys/password@tns_alias AS SYSDBA

ALTER USER anonymous ACCOUNT UNLOCK;
Removing anonymous access to the XML DB repository, not web services, can be accomplished by locking the anonymous database account, or setting the "" element back to "false".

If you need to remove the "" element entirely, it can be accomplished using the following code:

connect sys/password@tns_alias AS SYSDBA

SET SERVEROUTPUT ON
DECLARE
l_cfgxml XMLTYPE;
BEGIN
l_cfgxml := DBMS_XDB.cfg_get();

IF l_cfgxml.existsNode('/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access') != 0 THEN
SELECT deleteXML
(
l_cfgxml,
'/xdbconfig/sysconfig/protocolconfig/httpconfig/allow-repository-anonymous-access',
'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"'
)
INTO l_cfgxml
FROM dual;

DBMS_XDB.cfg_update(l_cfgxml);
DBMS_XDB.cfg_refresh;

DBMS_OUTPUT.put_line('Element deleted.');
END IF;
END;
/

My own Mind Map program in Java script and Python

I had been searching online mindmap apps for my study for a while and never got one that I am really happy with.  Then I asked myself what I...