Propagation over DB link with connection qualifier

I have been unable to get propagation between two 10.2.0.4 databases running across a dblink that includes a connection qualifier. The dblink is a fixed user link created like:
CREATE DATABASE LINK "DB4.WORLD@TRAINING"
CONNECT TO TRAINING
IDENTIFIED BY <pw>
USING 'DB4';
An "ORA-02019: connection description for remote database not found" error is thrown when AQ tries to propagate the message.
If the dblink is recreated
CREATE DATABASE LINK "DB4_TRAINING.WORLD"
CONNECT TO TRAINING
IDENTIFIED BY <pw>
USING 'DB4';
along with the underlying schedules and subscribers everything works fine. The "DB4_TRAINING.WORLD" name does not comply with global names which is what brought this all up. At this point the global_names parameter is still set to false on both databases.

Hi,
Then as I understand you do
CREATE DATABASE LINK "DB4.WORLD"
CONNECT TO TRAINING
IDENTIFIED BY <pw>
USING 'DB4';Regards,
Jari

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Database link with the alias and full description in the connect string

Hi,
i have created database link with alias in tnsentry and full description
and suppose i have removed the tnsnames.ora file what will be the impact on the database link that is whether database link will work or not i am sure db link created with alias won't work and how about db link created with full description and which one you prefer
Thanks

# Parameter file initora for Database prd
### Global database name is db_name.db_domain
global_names = TRUE
db_name = prd
db_domain = world
# TNSNAMES.ORA for prd ###############################
prd.world = (DESCRIPTION = (ADDRESS = (COMMUNITY = tcp.world)
(PROTOCOL = TCP) (Host = 100.10.100.1) (Port = 1521))
(CONNECT_DATA = (SID = prd) (GLOBAL_NAME = prd.world)
(SERVER = DEDICATED)))
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SQL> select GLOBAL_NAME from GLOBAL_NAME;
GLOBAL_NAME
prd.WORLD
CREATE DATABASE LINK prd
CONNECT TO system IDENTIFIED BY system_passwd
USING 'prd';--- alias
so the connection description will be ---select ename from [email protected]
useful link
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The picture ID on my outgoing Mac mail is not mine -- it's the photo of boyfriend of my mother in law is appearing as my ID photo. I have no link or connection with anybody or other accounts whatsoever, and I don't have ANY third-party networks myself.

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Interactive report performance problem over database link - Oracle Gateway

Hello all;
This is regarding a thread Interactive report performance problem over database link that was posted by Samo.
The issue that I am facing is when I use Oracle function like (apex_item.check_box) the query slow down by 45 seconds.
query like this: (due to sensitivity issue, I can not disclose real table name)
SELECT apex_item.checkbox(1,b.col3)
, a.col1
, a.col2
FROM table_one a
, table_two b
WHERE a.col3 = 12345
AND a.col4 = 100
AND b.col5 = a.col5
table_one and table_two are remote tables (non-oracle) which are connected using Oracle Gateway.
Now if I run above queries without apex_item.checkbox function the query return or response is less than a second but if I have apex_item.checkbox then the query run more than 30 seconds. I have resolved the issues by creating a collection but it’s not a good practice.
I would like to get ideas from people how to resolve or speed-up the query?
Any idea how to use sub-factoring for the above scenario? Or others method (creating view or materialized view are not an option).
Thank you.
Shaun S.

Hi Shaun
Okay, I have a million questions (could you tell me if both tables are from the same remote source, it looks like they're possibly not?), but let's just try some things first.
By now you should understand the idea of what I termed 'sub-factoring' in a previous post. This is to do with using the WITH blah AS (SELECT... syntax. Now in most circumstances this 'materialises' the results of the inner select statement. This means that we 'get' the results then do something with them afterwards. It's a handy trick when dealing with remote sites as sometimes you want the remote database to do the work. The reason that I ask you to use the MATERIALIZE hint for testing is just to force this, in 99.99% of cases this can be removed later. Using the WITH statement is also handled differently to inline view like SELECT * FROM (SELECT... but the same result can be mimicked with a NO_MERGE hint.
Looking at your case I would be interested to see what the explain plan and results would be for something like the following two statements (sorry - you're going have to check them, it's late!)
WITH a AS
(SELECT /*+ MATERIALIZE */ *
FROM table_one),
b AS
(SELECT /*+ MATERIALIZE */ *
FROM table_two),
sourceqry AS
(SELECT b.col3 x
       , a.col1 y
       , a.col2 z
FROM table_one a
    , table_two b
WHERE a.col3 = 12345
AND   a.col4 = 100
AND   b.col5 = a.col5)
SELECT apex_item.checkbox(1,x), y , z
FROM sourceqry
WITH a AS
(SELECT /*+ MATERIALIZE */ *
FROM table_one),
b AS
(SELECT /*+ MATERIALIZE */ *
FROM table_two)
SELECT apex_item.checkbox(1,x), y , z
FROM table_one a
    , table_two b
WHERE a.col3 = 12345
AND   a.col4 = 100
AND   b.col5 = a.col5If the remote tables are at the same site, then you should have the same results. If they aren't you should get the same results but different to the original query.
We aren't being told the real cardinality of the inners select here so the explain plan is distorted (this is normal for queries on remote and especially non-oracle sites). This hinders tuning normally but I don't think this is your problem at all. How many distinct values do you normally get of the column aliased 'x' and how many rows are normally returned in total? Also how are you testing response times, in APEX, SQL Developer, Toad SQLplus etc?
Sorry for all the questions but it helps to answer the question, if I can.
Cheers
Ben
http://www.munkyben.wordpress.com
Don't forget to mark replies helpful or correct ;)

Report over database link error

Good morning all.
I have a database link LINKA from USERA on LOCALSERVER to USERB on REMOTESERVER.
(create database link LINKA connect to USERB identified by mypassword using validtns)
In USERC on REMOTESERVER I have a TABLEX, with grant all on TABLEX to USERB on REMOTESERVER.
In USERB on REMOTESERVER I have a view TABLEXV, select * from USERC.TABLEX
From USERA on LOCALSERVER I can select * from TABLEXV@LINKA. In fact I can insert/update/delete tablexv from USERA.
I also have a view TABLEXV on USERA, select * from TABLEXV@LINKA. I can also select/insert/update/delete from USERA.TABLEXV.
So far so good - all working as expected.
Then, my APEX app on LOCALSERVER, interactive report, parsing schema USERA, querying TABLEXV, I get the following:
when "Exclude Link Column", I get the error "The requested URL /pls/apex/f was not found on server.
when "Link to Single Row View", report displays correctly.
when "Link to Custom Target", I get the error "The requested URL /pls/apex/f was not found on server.
When I run the select * from TABLEXV as a regular report (i.e. not interactive), I also get the error.
So the only time I get the report displayed correctly is using IR and "Link to Single Row View".
However, clicking on the link (for Single Row View) I get "The requested URL /pls/apex/wwv_flow.show was not found on this server.".
To summarize:
- accessing table via view over database link
- works outside of apex without issue
- inside only works when Link to Single Row View set
- But clicking on link fails
I could live with just having the Link to Singe Row View option if I could disable displaying of the icon so that the user cant click on it.
APEX 3.2.00.27
EE Database - 10.2.0.3 (yes I know out of support)
Remote EE Database - 10.2.0.5
Real object names replaced to protect the innocent!
Anyone got any clues?
I have used remote tables many times in my APEX applications and never had this issue.
Thanks,
Rob @ very confused .com

Good morning all.
I have a database link LINKA from USERA on LOCALSERVER to USERB on REMOTESERVER.
(create database link LINKA connect to USERB identified by mypassword using validtns)
In USERC on REMOTESERVER I have a TABLEX, with grant all on TABLEX to USERB on REMOTESERVER.
In USERB on REMOTESERVER I have a view TABLEXV, select * from USERC.TABLEX
From USERA on LOCALSERVER I can select * from TABLEXV@LINKA. In fact I can insert/update/delete tablexv from USERA.
I also have a view TABLEXV on USERA, select * from TABLEXV@LINKA. I can also select/insert/update/delete from USERA.TABLEXV.
So far so good - all working as expected.
Then, my APEX app on LOCALSERVER, interactive report, parsing schema USERA, querying TABLEXV, I get the following:
when "Exclude Link Column", I get the error "The requested URL /pls/apex/f was not found on server.
when "Link to Single Row View", report displays correctly.
when "Link to Custom Target", I get the error "The requested URL /pls/apex/f was not found on server.
When I run the select * from TABLEXV as a regular report (i.e. not interactive), I also get the error.
So the only time I get the report displayed correctly is using IR and "Link to Single Row View".
However, clicking on the link (for Single Row View) I get "The requested URL /pls/apex/wwv_flow.show was not found on this server.".
To summarize:
- accessing table via view over database link
- works outside of apex without issue
- inside only works when Link to Single Row View set
- But clicking on link fails
I could live with just having the Link to Singe Row View option if I could disable displaying of the icon so that the user cant click on it.
APEX 3.2.00.27
EE Database - 10.2.0.3 (yes I know out of support)
Remote EE Database - 10.2.0.5
Real object names replaced to protect the innocent!
Anyone got any clues?
I have used remote tables many times in my APEX applications and never had this issue.
Thanks,
Rob @ very confused .com

Help with connecting to NIST NTP server on port 123

I can get NIST time in Daytime format using the rt_nist_date_time.llb example posted on ni.com, but I cannot connect to NIST NTP format time data using port 123. I freely admit to being over my head with this stuff, and have spent much of this Thanksgiving holiday reading about UDP and TCP.
The attached vi summarizes what I've tried so far. The UDP case is what I thought would work, but I can't come up with a network address that the UDP-open vi likes. Can anyone out there help this n00b tell the time?
The attached file is supposed to be in 8.0 format, although I'm working in 9.0
Here is a link discussing the time formats: http://tf.nist.gov/service/its.htm
Jeff
Solved!
Go to Solution.
Attachments:
UDP.vi ‏17 KB

jstevens wrote:
THANK YOU!!! I don't think I ever would have come up with connecting the web address to a Read or Write UDP rather than the Open UDP block. Not to mention starting by opening port zero.
Unlike TCP, UDP is a connectionless protocol. Here's a quick explanation in different words.
A udp packet travels from a [sourceIP, sourcePort] to a [DestinationIP, destinationPort].
UDP open basically reserves a local port used for sending (soucePort) and receiving (incoming packet with that same destinationPort). Since some local ports are always in use, you would generate an error if you would accidentally pick a used port. Picking zero is useful for requests (as in this case!), because the OS will pick an unused ephemeral port. The actual source port number does not matter because the NTP server will just send the reply packet back to whatever port it came from. (If you would write your own NTP server in LabVIEW, you would of course need to set the local port to 123, and would get a conflict if another NTP server is already running on your rig). Writing an NTP server in LabVIEW would be a trivial modification to the current code, try it! . Simply listen for packets on port 123, form a response packet based on the timestamp, and send it to whatever IP/Port it came from (that info is available from udp read) and then go back to listen for new requests.).
UDP write sends a packet to the server using the above opened local port as source port. You can use the same connectionID to write to several other servers and ports, because UDP is connectionless. (TCP is connection based, so a TCP connection involves a defined source/destination pair)
UDP read listens for incoming packets from all over the world at that same local port. It is very unlikely, but theoretically possible that other UDP packets will arrive at that same port, so you could even filter to make sure to read incoming packets until they match the port and IP of the original request. The current code is somewhat vulnerable to a DOS (denial of service) attack for example as follows: Imagine the guy in the next cubicle had means of sniffing your network traffic. He could write a small program that looks for your NTP requests and then immediately starts flooding your IP with meaningless UDP packets to the sourcePort you just used. The current program only reads one packet and thus will never see the return packet from the NTP server.
UDP close frees up the local port and the computer is now no longer listening for packets on that port. Of course you could keep the port open for the duration of the program, especially if you intend to send UDP request once in a while during execution.
Makes sense?
LabVIEW Champion . Do more with less code and in less time .

Import Data over network link in oracle 11g

We want to take export of the OND schema in production database and
import it to the OND schema in UAT database over a network
link by using data pump,in Oracle 11g.Kindly share the steps.

Scenario:
Directly importing the TEST01 schema in the production database (oraodrmu) to test database oraodrmt, over
a network by using database link and data pump in Oracle 11g.
Note: When you perform an import over a database link, the import source is a database, not a dump file set, and the data is imported to the connected database instance.
Because the link can identify a remotely networked database, the terms database link and network link are used interchangeably.
=================================================================
STEP-1 (IN PRODUCTION DATABASE - oraodrmu)
=================================================================
[root@szoddb01]>su - oraodrmu
Enter user-name: /as sysdba
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> grant resource to test01;
Grant succeeded.
SQL> grant imp_full_database to test01;
Grant succeeded.
SQL> select owner,object_type,status,count(*) from dba_objects where owner='TEST01' group by owner,object_type,status;
OWNER OBJECT_TYPE STATUS COUNT(*)
TEST01 PROCEDURE     VALID 2
TEST01 TABLE VALID 419
TEST01 SEQUENCE VALID 3
TEST01 FUNCTION VALID 8
TEST01 TRIGGER VALID 3
TEST01 INDEX VALID 545
TEST01 LOB VALID 18
7 rows selected.
SQL>
SQL> set pages 999
SQL> col "size MB" format 999,999,999
SQL> col "Objects" format 999,999,999
SQL> select obj.owner "Owner"
2 , obj_cnt "Objects"
3 , decode(seg_size, NULL, 0, seg_size) "size MB"
4 from (select owner, count(*) obj_cnt from dba_objects group by owner) obj
5 , (select owner, ceil(sum(bytes)/1024/1024) seg_size
6 from dba_segments group by owner) seg
7 where obj.owner = seg.owner(+)
8 order by 3 desc ,2 desc, 1
9 /
Owner Objects size MB
OND                    8,097     284,011
SYS                    9,601     1,912
TEST01                    998     1,164
3 rows selected.
SQL> exit
=================================================================
STEP-2 (IN TEST DATABASE - oraodrmt)
=================================================================
[root@szoddb01]>su - oraodrmt
[oraodrmt@szoddb01]>sqlplus
SQL*Plus: Release 11.2.0.2.0 Production on Mon Dec 3 18:40:16 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter user-name: /as sysdba
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select name,open_mode from v$database;
NAME OPEN_MODE
ODRMT READ WRITE
SQL> create tablespace test_test datafile '/trn_u04/oradata/odrmt/test01.dbf' size 2048m;
Tablespace created.
SQL> create user test01 identified by test123 default tablespace test_test;
User created.
SQL> grant resource, create session to test01;
Grant succeeded.
SQL> grant EXP_FULL_DATABASE to test01;
Grant succeeded.
SQL> grant imp_FULL_DATABASE to test01;
Grant succeeded.
Note: ODRMU is the DNS hoste name.We can test the connect with: [oraodrmt@szoddb01]>sqlplus test01/test01@odrmu
SQL> create directory test_network_dump as '/dbdump/test_exp';
Directory created.
SQL> grant read,write on directory test_network_dump to test01;
Grant succeeded.
SQL> conn test01/test123
Connected.
SQL> create DATABASE LINK remote_test CONNECT TO test01 identified by test01 USING 'ODRMU';
Database link created.
For testing the database link we can try the below sql:
SQL> select count(*) from OA_APVARIABLENAME@remote_test;
COUNT(*)
59
SQL> exit
[oraodrmt@szoddb01]>impdp test01/test123 network_link=remote_test directory=test_network_dump remap_schema=test01:test01 logfile=impdp__networklink_grms.log;
[oraodrmt@szoddb01]>
Import: Release 11.2.0.2.0 - Production on Mon Dec 3 19:42:47 2012
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "TEST01"."SYS_IMPORT_SCHEMA_01": test01/******** network_link=remote_test directory=test_network_dump remap_schema=test01:test01 logfile=impdp_grms_networklink.log
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 318.5 MB
Processing object type SCHEMA_EXPORT/USER
ORA-31684: Object type USER:"TEST01" already exists
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/SEQUENCE/SEQUENCE
Processing object type SCHEMA_EXPORT/TABLE/TABLE
. . imported "TEST01"."SY_TASK_HISTORY" 779914 rows
. . imported "TEST01"."JCR_JNL_JOURNAL" 603 rows
. . imported "TEST01"."GX_GROUP_SHELL" 1229 rows
Job "TEST01"."SYS_IMPORT_SCHEMA_01" completed with 1 error(s) at 19:45:19
[oraodrmt@szoddb01]>sqlplus
SQL*Plus: Release 11.2.0.2.0 Production on Mon Dec 3 19:46:04 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter user-name: /as sysdba
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select owner,object_type,status,count(*) from dba_objects where owner='TEST01' group by owner,object_type,status;
OWNER OBJECT_TYPE STATUS COUNT(*)
TEST01 PROCEDURE          VALID 2
TEST01 TABLE               VALID 419
TEST01 SEQUENCE          VALID 3
TEST01 FUNCTION          VALID 8
TEST01 TRIGGER          VALID 3
TEST01 INDEX               VALID 545
TEST01 LOB               VALID 18
TEST01 DATABASE LINK          VALID 1
8 rows selected.
SQL>
SQL> set pages 999
SQL> col "size MB" format 999,999,999
SQL> col "Objects" format 999,999,999
SQL> select obj.owner "Owner"
2 , obj_cnt "Objects"
3 , decode(seg_size, NULL, 0, seg_size) "size MB"
4 from (select owner, count(*) obj_cnt from dba_objects group by owner) obj
5 , (select owner, ceil(sum(bytes)/1024/1024) seg_size
6 from dba_segments group by owner) seg
7 where obj.owner = seg.owner(+)
8 order by 3 desc ,2 desc, 1
9 /
Owner Objects size MB
OND                8,065          247,529
SYS               9,554          6,507
TEST01               999          1,164
13 rows selected.
=================================================================
STEP-3 FOR REMOVING THE DATABASE LINK
=================================================================
[oraodrmt@szoddb01]>sqlplus
SQL*Plus: Release 11.2.0.2.0 Production on Mon Dec 3 19:16:01 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter user-name: /as sysdba
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> drop database link remote_test;
Database link dropped.

Propagation over DB link with connection qualifier

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