Oracle streams configuration

Hi,
Our organization is planning to implement Oracle streams. I have couple of fundamental questions:
1. Can you configure Oracle Streams while the source database is up and running?
2. I think the answer is yes, but please confirm that the LCR data can be extracted and transformed before applying to the target
3. Is there any performance impact on the source database if Oracle Streams is enabled? If yes, how much?
Thats all for now
Thanks

See my answers inline.
1. Can you configure Oracle Streams while the source database is up and running?
YES. Your database must be up and running to create streams processes.
2. I think the answer is yes, but please confirm that the LCR data can be extracted and transformed before applying to the target
You have to instantiate the target database so that there source and target are in sync.
3. Is there any performance impact on the source database if Oracle Streams is enabled? If yes, how much?
There is a minimal overhead of running the capture process on the source. But this should be negligable. This also depends upon what is being streamed i.e. LOB's are being streamed, high transaction volume etc.

Similar Messages

Oracle streams configuration problem

Hi all,
i'm trying to configure oracle stream to my source database (oracle 9.2) and when i execute the package DBMS_LOGMNR_D.SET_TABLESPACE('LOGMNRTS'); i got an error bellow:
ERROR at line 1:
ORA-01353: existing Logminer session
ORA-06512: at "SYS.DBMS_LOGMNR_D", line 2238
ORA-06512: at line 1
When checking some docs, they told i have to destraoy all logminer session, and i verify to v$session view and cannot identify logminer session. If someone can help me because i need this sttream tools for schema synchronization of my production database and datawarehouse database.
That i want is how to destroy or stop logminer session.
Thnaks for your help
regards
raitsarevo

Thanks Werner, it's ok now my problem is solved and here bellow the output of your script.
I profit if you have some docs or some advise for my database schema synchronisation, is using oracle sctrems is the best or can i use anything else but not Dataguard concept or standby database because i only want to apply DMl changes not DDL. If you have some docs for Oracle streams and especially for schema synchronization not tables.
many thanks again, and please send to my email address [email protected] if needed
ABILLITY>DELETE FROM system.logmnr_uid$;
1 row deleted.
ABILLITY>DELETE FROM system.logmnr_session$;
1 row deleted.
ABILLITY>DELETE FROM system.logmnrc_gtcs;
0 rows deleted.
ABILLITY>DELETE FROM system.logmnrc_gtlo;
13 rows deleted.
ABILLITY>EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('LOGMNRTS');
PL/SQL procedure successfully completed.
regards
raitsarevo

Error during removinf Oracle streams configuration in oracle 10g

Hi,
When i am trying to remove stream comfiguration at capture side..it is giving me following error:
SQL> execute DBMS_STREAMS_ADM.REMOVE_STREAMS_CONFIGURATION();
BEGIN DBMS_STREAMS_ADM.REMOVE_STREAMS_CONFIGURATION(); END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00201: identifier 'DBMS_STREAMS_ADM' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
by connecting which user i need to run this.
Thanks

This error is coming
SQL> execute DBMS_STREAMS_ADM.REMOVE_STREAMS_CONFIGURATION();
BEGIN DBMS_STREAMS_ADM.REMOVE_STREAMS_CONFIGURATION(); END;
ERROR at line 1:
ORA-06564: object "NCM"."BIN$dD1n7UJhZcPgRAAUTxcb/g==$0" does not exist
ORA-06512: at "SYS.DBMS_LOGREP_UTIL", line 82
ORA-06512: at "SYS.DBMS_LOGREP_UTIL", line 115
ORA-06512: at "SYS.DBMS_CAPTURE_ADM_INTERNAL", line 490
ORA-01403: no data found
ORA-06512: at "SYS.DBMS_CAPTURE_ADM", line 395
ORA-06512: at "SYS.DBMS_STREAMS_ADM", line 1877
ORA-06512: at line 1

Help on Oracle streams 11g configuration

Hi Streams experts
Can you please validate the following creation process steps ?
What is need to have streams doing is a one way replication of the AR
schema from a database to another database. Both DML and DDL shall do
the replication of the data.
Help on Oracle streams 11g configuration. I would also need your help
on the maintenance steps, controls and procedures
2 databases
1 src as source database
1 dst as destination database
replication type 1 way of the entire schema FaeterBR
Step 1. Set all databases in archivelog mode.
Step 2. Change initialization parameters for Streams. The Streams pool
size and NLS_DATE_FORMAT require a restart of the instance.
SQL> alter system set global_names=true scope=both;
SQL> alter system set undo_retention=3600 scope=both;
SQL> alter system set job_queue_processes=4 scope=both;
SQL> alter system set streams_pool_size= 20m scope=spfile;
SQL> alter system set NLS_DATE_FORMAT=
'YYYY-MM-DD HH24:MI:SS' scope=spfile;
SQL> shutdown immediate;
SQL> startup
Step 3. Create Streams administrators on the src and dst databases,
and grant required roles and privileges. Create default tablespaces so
that they are not using SYSTEM.
---at the src
SQL> create tablespace streamsdm datafile
'/u01/product/oracle/oradata/orcl/strepadm01.dbf' size 100m;
---at the replica:
SQL> create tablespace streamsdm datafile
---at both sites:
'/u02/oracle/oradata/str10/strepadm01.dbf' size 100m;
SQL> create user streams_adm
identified by streams_adm
default tablespace strepadm01
temporary tablespace temp;
SQL> grant connect, resource, dba, aq_administrator_role to
streams_adm;
SQL> BEGIN
DBMS_STREAMS_AUTH.GRANT_ADMIN_PRIVILEGE (
grantee => 'streams_adm',
grant_privileges => true);
END;
Step 4. Configure the tnsnames.ora at each site so that a connection
can be made to the other database.
Step 5. With the tnsnames.ora squared away, create a database link for
the streams_adm user at both SRC and DST. With the init parameter
global_name set to True, the db_link name must be the same as the
global_name of the database you are connecting to. Use a SELECT from
the table global_name at each site to determine the global name.
SQL> select * from global_name;
SQL> connect streams_adm/streams_adm@SRC
SQL> create database link DST
connect to streams_adm identified by streams_adm
using 'DST';
SQL> select sysdate from dual@DST;
SLQ> connect streams_adm/streams_adm@DST
SQL> create database link SRC
connect to stream_admin identified by streams_adm
using 'SRC';
SQL> select sysdate from dual@SRC;
Step 6. Control what schema shall be replicated
FaeterBR is the schema to be replicated
Step 7. Add supplemental logging to the FaeterBR schema on all the
tables?
SQL> Alter table FaeterBR.tb1 add supplemental log data
(ALL) columns;
SQL> alter table FaeterBR.tb2 add supplemental log data
(ALL) columns;
etc...
Step 8. Create Streams queues at the primary and replica database.
---at SRC (primary):
SQL> connect stream_admin/stream_admin@ORCL
SQL> BEGIN
DBMS_STREAMS_ADM.SET_UP_QUEUE(
queue_table => 'streams_adm.FaeterBR_src_queue_table',
queue_name => 'streams_adm.FaeterBR_src__queue');
END;
---At DST (replica):
SQL> connect stream_admin/stream_admin@STR10
SQL> BEGIN
DBMS_STREAMS_ADM.SET_UP_QUEUE(
queue_table => 'stream_admin.FaeterBR_dst_queue_table',
queue_name => 'stream_admin.FaeterBR_dst_queue');
END;
Step 9. Create the capture process on the source database (SRC).
SQL> BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
schema_name =>'FaeterBR',
streams_type =>'capture',
streams_name =>'FaeterBR_src_capture',
queue_name =>'FaeterBR_src_queue',
include_dml =>true,
include_ddl =>true,
include_tagged_lcr =>false,
source_database => NULL,
inclusion_rule => true);
END;
Step 10. Instantiate the FaeterBR schema at DST. by doing export
import : Can I use now datapump to do that ?
---AT SRC:
exp system/superman file=FaeterBR.dmp log=FaeterBR.log
object_consistent=y owner=FaeterBR
---AT DST:
---Create FaeterBR tablespaces and user:
create tablespace FaeterBR_datafile
'/u02/oracle/oradata/str10/FaeterBR_01.dbf' size 100G;
create tablespace ws_app_idx datafile
'/u02/oracle/oradata/str10/FaeterBR_01.dbf' size 100G;
create user FaeterBR identified by FaeterBR_
default tablespace FaeterBR_
temporary tablespace temp;
grant connect, resource to FaeterBR;
imp system/123db file=FaeterBR_.dmp log=FaeterBR.log fromuser=FaeterBR
touser=FaeterBR streams_instantiation=y
Step 11. Create a propagation job at the source database (SRC).
SQL> BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
schema_name =>'FaeterBR',
streams_name =>'FaeterBR_src_propagation',
source_queue_name =>'stream_admin.FaeterBR_src_queue',
destination_queue_name=>'stream_admin.FaeterBR_dst_queue@dst',
include_dml =>true,
include_ddl =>true,
include_tagged_lcr =>false,
source_database =>'SRC',
inclusion_rule =>true);
END;
Step 12. Create an apply process at the destination database (DST).
SQL> BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
schema_name =>'FaeterBR',
streams_type =>'apply',
streams_name =>'FaeterBR_Dst_apply',
queue_name =>'FaeterBR_dst_queue',
include_dml =>true,
include_ddl =>true,
include_tagged_lcr =>false,
source_database =>'SRC',
inclusion_rule =>true);
END;
Step 13. Create substitution key columns for äll the tables that
haven't a primary key of the FaeterBR schema on DST
The column combination must provide a unique value for Streams.
SQL> BEGIN
DBMS_APPLY_ADM.SET_KEY_COLUMNS(
object_name =>'FaeterBR.tb2',
column_list =>'id1,names,toys,vendor');
END;
Step 14. Configure conflict resolution at the replication db (DST).
Any easier method applicable the schema?
DECLARE
cols DBMS_UTILITY.NAME_ARRAY;
BEGIN
cols(1) := 'id';
cols(2) := 'names';
cols(3) := 'toys';
cols(4) := 'vendor';
DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
object_name =>'FaeterBR.tb2',
method_name =>'OVERWRITE',
resolution_column=>'FaeterBR',
column_list =>cols);
END;
Step 15. Enable the capture process on the source database (SRC).
BEGIN
DBMS_CAPTURE_ADM.START_CAPTURE(
capture_name => 'FaeterBR_src_capture');
END;
Step 16. Enable the apply process on the replication database (DST).
BEGIN
DBMS_APPLY_ADM.START_APPLY(
apply_name => 'FaeterBR_DST_apply');
END;
Step 17. Test streams propagation of rows from source (src) to
replication (DST).
AT ORCL:
insert into FaeterBR.tb2 values (
31000, 'BAMSE', 'DR', 'DR Lejetoej');
AT STR10:
connect FaeterBR/FaeterBR
select * from FaeterBR.tb2 where vendor= 'DR Lejetoej';
Any other test that can be made?

Check the metalink doc 301431.1 and validate
How To Setup One-Way SCHEMA Level Streams Replication [ID 301431.1]
Oracle Server Enterprise Edition - Version: 10.1.0.2 to 11.1.0.6
Cheers.

Problem in configuring Oracle Streams

Hi Experts,
I am trying to configure oracle streams on oracle 10g through OEM, among the 5 steps, all steps went smooth, the very last step that asks the host username and host password is giving error "Login Error - oracle.sysman.emSDK.admObj.AdminObjectException: ERROR: Wrong password for user"
I want one complete schema to be replicated...
Source :
Oracle : 10.2.0.1
OS : Windows
User : administrator/passwd
Dest :
Oracle : 10.2.0.4
OS : RHEL 4.7
User : oracle/oracle
please help me, thanks

Hello, Pls how did you reset your password. I have changed my password but still is not working. Pls give me step to do that.
Waiting for your reply.
Thanks

Having trouble setting up Oracle streams. Help!

I'm running Oracle 10g Enterprise server and am trying to set up a streams connection between two databases on the server.
I'm using the Enterprise Manager grid control console to do this. I log into database_1 and I go to the streams section and pick the "Streams Global, Schema, Table and Subset Replication Wizard" link in the setup options.
I create my streams admin account. Question: Does the Streams Administrator have to be account with a dba role? I just set my dba Streams Admin the same as my 'sys' account.
I go on the the Configure Streams: Destination Database.
I put in the host name, port, sid and streams admin and pwd for database_1
When i click next i'm getting the following error.
"There is a problem with the destination connection information. It could be due to invalid host credentials and / or invalid Streams Administrator credentials."
I'm pretty sure my connection information is correct. I can connect to both databases using SQLdeveloper using the same connection info. And I think i properly set up the streams Admin for my database_2. So i'm not sure why i'm getting the error.
can anyone help?

I had a similar problem. Another issue that came along with this was that I was unable to set the credentials for one of the monitored servers in my Stream configuration. It turns out that the agent that I was using wasn't compatible with my GRID installation. I upgraded my agent, verified that I could set the preferred credentials, then successfully set up Streams.
Hope that this helps.

Complete Removal of Stream Configuration in 9.2

Could any one send me the script for complete removal of streams configuration in oracle 9i database. I faces a lot of error while creating stream configuration.

Hi,
Agree with Willard Martin. If you want to a DAG member, you need to remove database copies first, then you can remove the Mailbox Server from the DAG.
Here is a related article for your reference. Even though this article is for Exchange 2013, it also applies to Exchange 2010.
http://exchangeserverpro.com/exchange-2013-how-to-remove-dag-member/
Best regards,
Belinda Ma
TechNet Community Support

Oracle Streams 9i Database Link Error

Can anyone be help me regarding Oracle Streams 9i
Oracle Version: 9.2.0.5.0
Initial parameters:
global_name=true
aq_tm_processes=1
job_queue_process=10
log_parallelism=1 scope=spfile
database is in archivelog;
I executed the following SQL statements:
CONNECT sys/xxxxx@db1 AS SYSDBA
CREATE USER strmadmin IDENTIFIED BY strmadminpw
DEFAULT TABLESPACE users QUOTA UNLIMITED ON users;
GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_APPLY_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_FLASHBACK TO strmadmin;
BEGIN
DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
privilege => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ,
grantee => 'strmadmin',
grant_option => FALSE);
END;
BEGIN
DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
privilege => DBMS_RULE_ADM.CREATE_RULE_OBJ,
grantee => 'strmadmin',
grant_option => FALSE);
END;
CONNECT strmadmin/strmadminpw@db1
EXEC DBMS_STREAMS_ADM.SET_UP_QUEUE();
CREATE DATABASE LINK db2 CONNECT TO strmadmin IDENTIFIED BY strmadminpw USING 'DB2';
CONNECT sys/xxxxx@db2 AS SYSDBA
CREATE USER strmadmin IDENTIFIED BY strmadminpw
DEFAULT TABLESPACE users QUOTA UNLIMITED ON users;
GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_APPLY_ADM TO strmadmin;
GRANT EXECUTE ON DBMS_FLASHBACK TO strmadmin;
BEGIN
DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
privilege => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ,
grantee => 'strmadmin',
grant_option => FALSE);
END;
BEGIN
DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
privilege => DBMS_RULE_ADM.CREATE_RULE_OBJ,
grantee => 'strmadmin',
grant_option => FALSE);
END;
CONNECT strmadmin/strmadminpw@db2
EXEC DBMS_STREAMS_ADM.SET_UP_QUEUE();
CONNECT sys/xxxxx@db2 as sysdba
GRANT ALL ON scott.dept TO strmadmin;
CONNECT sys/xxxxx@db1 AS SYSDBA
CREATE TABLESPACE logmnr_ts DATAFILE 'D:\oracle\oradata\db1\logmnr01.dbf'
SIZE 25 M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED;
EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('logmnr_ts');
CONNECT sys/xxxxx@db1 AS SYSDBA
ALTER TABLE scott.dept ADD SUPPLEMENTAL LOG GROUP log_group_dept_pk (deptno) ALWAYS;
CONNECT strmadmin/strmadminpw@db1
BEGIN
DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
table_name => 'scott.dept',
streams_name => 'db1_to_db2',
source_queue_name => 'strmadmin.streams_queue',
destination_queue_name => 'strmadmin.streams_queue@db2',
include_dml => true,
include_ddl => true,
source_database => 'db1');
END;
CONNECT strmadmin/strmadminpw@db1
BEGIN
DBMS_STREAMS_ADM.ADD_TABLE_RULES(
table_name => 'scott.dept',
streams_type => 'capture',
streams_name => 'capture_simp',
queue_name => 'strmadmin.streams_queue',
include_dml => true,
include_ddl => true);
END;
Did this exp/imp
exp userid=scott/tiger@db1 FILE=dept_instant.dmp TABLES=dept OBJECT_CONSISTENT=y ROWS=n
imp userid=scott/tiger@db2 FILE=dept_instant.dmp IGNORE=y COMMIT=y LOG=import.log STREAMS_INSTANTIATION=y
and then
CONNECT sys/xxxxx@db2 AS SYSDBA
ALTER TABLE scott.dept DROP SUPPLEMENTAL LOG GROUP log_group_dept_pk;
CONNECT strmadmin/strmadminpw@db2
BEGIN
DBMS_STREAMS_ADM.ADD_TABLE_RULES(
table_name => 'scott.dept',
streams_type => 'apply',
streams_name => 'apply_simp',
queue_name => 'strmadmin.streams_queue',
include_dml => true,
include_ddl => true,
source_database => 'db1');
END;
CONNECT strmadmin/strmadminpw@db2
BEGIN
DBMS_APPLY_ADM.SET_PARAMETER(
apply_name => 'apply_simp',
parameter => 'disable_on_error',
value => 'n');
DBMS_APPLY_ADM.START_APPLY(
apply_name => 'apply_simp');
END;
CONNECT strmadmin/strmadminpw@db1
BEGIN
DBMS_CAPTURE_ADM.START_CAPTURE(
capture_name => 'capture_simp');
END;
Here is my problem:
After i configured it the streams still cannot replicate. And when I checked the EM GUI for streams monitoring it displays a broken database link.
Also it says that the database link is not active.
Can anyone please help?
Thanks.

I don't know what Datacomp is, but you should be able
to connect to any non-Oracle database if there is
an ODBC driver for it. You would use Generic
Heterogeneous Services to do this. See the following
link to the documentation for details:
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96544/gencon.htm#1656
There are also several articles on the Net. Do a google
search on oracle generic heterogeneous services /
connectivity.
Hope this helps.
Kailash.

Oracle Streaming Queues in Oracle 10G standard Edition

I would like to configure and implement Oracle Streaming Queues in Oracle 10G standard Edition. If it is possible then please guide me and give me some clues and if not then please advise me some alternate method.

Here is the guidance you requested.
License information:
http://download.oracle.com/docs/cd/B19306_01/license.102/b14199/toc.htm
Technical information:
http://tahiti.oracle.com/
Since I don't even know what version you have ... this is as far as I can take you.

Oracle Streams 'ORA-25215: user_data type and queue type do not match'

I am trying replication between two databases (10.2.0.3) using Oracle Streams.
I have followed the instructions at http://www.oracle.com/technology/oramag/oracle/04-nov/o64streams.html
The main steps are:
1. Set up ARCHIVELOG mode.
2. Set up the Streams administrator.
3. Set initialization parameters.
4. Create a database link.
5. Set up source and destination queues.
6. Set up supplemental logging at the source database.
7. Configure the capture process at the source database.
8. Configure the propagation process.
9. Create the destination table.
10. Grant object privileges.
11. Set the instantiation system change number (SCN).
12. Configure the apply process at the destination database.
13. Start the capture and apply processes.
For step 5, I have used the 'set_up_queue' in the 'dbms_strems_adm package'. This procedure creates a queue table and an associated queue.
The problem is that, in the propagation process, I get this error:
'ORA-25215: user_data type and queue type do not match'
I have checked it, and the queue table and its associated queue are created as shown:
sys.dbms_aqadm.create_queue_table (
queue_table => 'CAPTURE_SFQTAB'
, queue_payload_type => 'SYS.ANYDATA'
, sort_list => ''
, COMMENT => ''
, multiple_consumers => TRUE
, message_grouping => DBMS_AQADM.TRANSACTIONAL
, storage_clause => 'TABLESPACE STREAMSTS LOGGING'
, compatible => '8.1'
, primary_instance => '0'
, secondary_instance => '0');
sys.dbms_aqadm.create_queue(
queue_name => 'CAPTURE_SFQ'
, queue_table => 'CAPTURE_SFQTAB'
, queue_type => sys.dbms_aqadm.NORMAL_QUEUE
, max_retries => '5'
, retry_delay => '0'
, retention_time => '0'
, COMMENT => '');
The capture process is 'capturing changes' but it seems that these changes cannot be enqueued into the capture queue because the data type is not correct.
As far as I know, 'sys.anydata' payload type and 'normal_queue' type are the right parameters to get a successful configuration.
I would be really grateful for any idea!

Hi
You need to run a VERIFY to make sure that the queues are compatible. At least on my 10.2.0.3/4 I need to do it.
DECLARE
rc BINARY_INTEGER;
BEGIN
DBMS_AQADM.VERIFY_QUEUE_TYPES(
src_queue_name => 'np_out_onlinex',
dest_queue_name => 'np_out_onlinex',
rc => rc, , destination => 'scnp.pfa.dk',
transformation => 'TransformDim2JMS_001x');
DBMS_OUTPUT.PUT_LINE('Compatible: '||rc);
If you dont have transformations and/or a remote destination - then delete those params.
Check the table: SYS.AQ$_MESSAGE_TYPES there you can see what are verified or not
regards
Mette

Stream Configuration between different 11gr1 and 11gr2

I have oracle downstream set-up between two DBs both are 11gr1, i want to upgrade my my target DB to 11gr2. I want to ask whether my streams set-up would work after this or not.
OR
Is it possible have streaming between two version of oracle.
I shall be V thankful for you guidance.

Hi,
Yes it possible to have streams configured between 2 different versions.
Anand

BLOB in Oracle Streams

Oracle 10.2.0.4:
I am new to Oracle streams and just reading docs at this point. I read in http://download.oracle.com/docs/cd/B19306_01/server.102/b14229.pdf doc that BLOB are not supported by streams. I am just looking for basic stream configuration with some rule processing which will send LCR from source queue to destination queue. And as I understand I can do that by using ANYDATA payload.
We have some tables witih BLOB data.

It's all a balancing act. If you absolutely need both data centers processing transactions simultaneously, you'll need Streams.
Lets start with the simplest possible case of this, two data centers A and B, with databases 1 and 2. Database 1 is in data center A, database 2 is in data center B. If database 1 fails, would you be able to shift traffic to database 2 relatively easily? Assuming that you're building in functionality to shift load between databases, which is normally the case when you're building this sort of distributed application, it may be easier to do this sort of shift regardless of the reason that database 1 fails.
If you have a standby database in each data center (1A as the standby for database 1, 2A as the standby for database 2), when 1 fails, you have to figure out whether whatever caused 1 to fail will also cause 1A to fail. If data center A is having connectivity or power issues, for example, you would have to shift traffic to 2 rather than failing 1 over to 1A. On the other hand, if it was an isolated server failure, you could either shift traffic to 2 or fail over to 1A. There is some risk that having a more complex failure scenario makes it more likely that someone makes a mistake-- there will be a number of failover steps that you'd do only if you're failing from 1 to 1A and other steps that you'd do if you were shifting traffic from 1 to 2 and some steps that are common-- and makes it more difficult to fully test all the scenarios. On the other hand, there may well be benefits to having more options to respond to different sorts of failures. And politics/ reporting structure as well as geography plays a role here-- if the data centers are on different continents, shifting traffic is probably much less desirable than if you have two US data centers.
If, rather than having standbys 1A and 2A, database 1 and 2 were really multi-node RAC clusters, both database 1 and database 2 would be able to survive most sorts of localized hardware failure (i.e. one node can fail on database 1 without affecting whether database 1 is up and processing transactions). If there was a data center wide failure, you'd still have to shift traffic. But one server dying in a pile wouldn't be an issue. Of course, there would be a handful of events that could take down the entire RAC cluster without affecting the data center where a standby could potentially be used (i.e. the SAN for the cluster fails but the standby is using a different SAN). Those may not be particularly likely, however, so it may make sense not to bother with contingency planning for them and just assume that anything that knocks out all the nodes of the cluster forces traffic to be shifted to 2 and that it wouldn't be worth trying to maintain a standby for those scenarios.
There are lots of trade-offs here. You have simplicity of setup, you have simplicity of failover, you have robustness, etc. And there are going to be cases where you realistically need to take a stab at predicting how likely various events are which gets pretty deeply into hardware, setup, and politics (i.e. how likely a server is to fail depends on whether you've bought a high-end server with doubly-rundundant-everything or a commodity linux box, how likely a data center is to fail depends on the data center's redundancy measures and your level of confidence in those measures, etc)
Justin

Complex Oracle Streams issue - Update conflicts

This is for Oracle streams replication on 11g r2.
I am facing update conflicts in a table. The conflict arise due to technical and business logic issue. The business logic will pass through the replication/apply process successfully but we want to arrest and resolve it before replication for our requirements. These are typically a bit complex cases and we are exploring the possibility of having both DML handlers and Error handlers. The DML handlers will take care of business logic conflicts and Error handler for technical issues before pushing it to Error queue by Streams. Based on our understanding and verification, we found a limitation to configure both procedure DML handler and Error handler together for the same table operation.
Statement handlers can not be used for our conflict scenarios.
Following are my questions:
1. Have anyone implemented or faced such a scenario in their real time application? If yes, can you please share some insights or inputs?
2. Is there a custom way to handle this complex problem of configuring both DML and Error handler?
3. Is there any alternative possible way to resolve this situation at Oracle streams environment with other handlers?

Dear All
I too have a similar requirement. Could anyone help with one?
We can handle the error-ing transactions via Error Handler procedures.
But we can not configure the DML handler procedure for transactions that are successfully replicated. STreams does not allow us to configure a handler for this. Is there any other handler / procedures / hooks in streams where we can implement the desired functionality - which includes changing the values in the LCR before invoking lcr.execute() and we should be able to discard the LCR also if required.
Regards
Velmurugan
Edited by: 982387 on Jan 16, 2013 11:25 PM
Edited by: 982387 on Jan 16, 2013 11:27 PM

Execution of Row level trigger in Oracle Streams.

Hi All,
Oracle Database version : 9.2.0.4 on windows NT/2000 environment.
We managed to install,configure oracle stream technologies.
Oracle Stream seems to be working fine for replication of DML & DDL changes from source database to target database.
Following is detail at source end.
Source Sid = acc
Source Schema = stream
Source Table = dept
structure of dept table.
Name Null? Type
DEPTNO NOT NULL NUMBER(5)
DNAME NOT NULL VARCHAR2(10)
LOC NOT NULL VARCHAR2(10)
Streamadmin user = strmadmin
Following is detail at target end.
Target Sid = fin
Target Schema = stream
Target Table = dept
structure of dept table.
Name Null? Type
DEPTNO NOT NULL NUMBER(5)
DNAME NOT NULL VARCHAR2(10)
LOC NOT NULL VARCHAR2(10)
TRAN_DATE NULL DATE DEFAULT SYSDATE
I checked on insert/update/delete of rows into dept table at source database, changes are correctly replicated to target table dept.
I wrote a simple trigger which is as follows on dept table at target database.
create or replace trigger dept_upd_del
before delete or update of dname,loc on stream.dept
for each row
begin
dbms_output.put_line('Inside Trigger');
if updating then
dbms_output.put_line('Update');
insert into stream.dept_change values (:old.deptno,'U',sysdate);
end if;
if deleting then
dbms_output.put_line('Delete');
insert into stream.dept_change values (:old.deptno,'D',sysdate);
end if;
end;
I expect this trigger to get executed whenever changes occurs into dept table at target database whenever dml changes are propagated from source to target table. However i found that the above trigger is not executed at all.
I was further surprised, since incase i update/delete rows from target table dept the above trigger is executing correctly.
Can someone please let me know about this?
I believe stream technology is using INSERT / UPDATE & DELETE statement when changes are applied at target table but this doesn't seems to be the case.
Thanks in Advance.
Regards,
Vidyanand

The trigger at the destination will not fire because it already has at the source site. Read about that in the streams documentation on page 4-25. To change the "fire once" property of the trigger, use the procedure SET_TRIGGER_FIRING_PROPERTY in the DBMS_DDL package.
Hope this helps.
Claudine

Oracle stream not working as Logminer is down

Hi,
Oracle streams capture process is not capturing any updates made on table for which capture & apply process are configured.
Capture process & apply process are running fine showing enabled as status & no error. But, No new records are captured in ‘streams_queue_table’ when I update record in table, which is configured for capturing changes.
This setup was working till I got ‘ORA-01341: LogMiner out-of-memory’ error in alert.log file. I guess logminer is not capturing the updates from redo log.
Current Alert log is showing following lines for logminer init process
LOGMINER: Parameters summary for session# = 1
LOGMINER: Number of processes = 3, Transaction Chunk Size = 1
LOGMINER: Memory Size = 10M, Checkpoint interval = 10M
But same log was like this before
LOGMINER: Parameters summary for session# = 1
LOGMINER: Number of processes = 3, Transaction Chunk Size = 1
LOGMINER: Memory Size = 10M, Checkpoint interval = 10M
LOGMINER: session# = 1, reader process P002 started with pid=18 OS id=5812
LOGMINER: session# = 1, builder process P003 started with pid=36 OS id=3304
LOGMINER: session# = 1, preparer process P004 started with pid=37 OS id=1496We can clearly see reader, builder & preparer process are not starting after I got Out of memory exception in log miner.
To allocate more space to logminer, I tried to setup tablespace to logminer I got 2 exception which was contradicting each other error.
SQL> exec DBMS_LOGMNR.END_LOGMNR();
BEGIN DBMS_LOGMNR.END_LOGMNR(); END;
*ERROR at line 1:
ORA-01307: no LogMiner session is currently activeORA-06512: at "SYS.DBMS_LOGMNR", line 76
ORA-06512: at line 1
SQL> EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('logmnrts');
BEGIN DBMS_LOGMNR_D.SET_TABLESPACE('logmnrts'); END;
*ERROR at line 1:
ORA-01356: active logminer sessions foundORA-06512: at "SYS.DBMS_LOGMNR_D", line 232
ORA-06512: at line 1
When I tried stopping logminer exception was ‘no logminer session is active’, But when I tried to setup tablespace exception was ‘active logminer sessions found’. I am not sure how to resolve this issue.
Please let me know how to resolve this issue.
Thanks
siva

The Logminer session associated with a capture process is a special kind of session which is called a "persistent session". You will not be able to stop it using DBMS_LOGMNR. This package controls only non-persistent sessions.
To stop the persistent LogMiner session you must stop the capture process.
However, I think your problem is more related to a lack of RAM space instead of tablespace (i. e, disk) space. Try to increase the size of the SGA allocated to LogMiner, by setting capture parameter SGASIZE. I can see you are using the default of 10M, which may be not enough for your case. Of course, you will have to increase the values of init parameters streams_pool_size, sga_target/sga_max_size accordingly, to avoid other memory problems.
To set the SGASIZE parameter, use the PL/SQL procedure DBMS_CAPTURE_ADM.SET_PARAMETER. The example below would set it to 100Megs:
begin
DBMS_CAPTURE_ADM.set_parameter('<name of capture process','_SGA_SIZE','100');
end;
I hope this helps.
Ilidio.

Oracle streams configuration

Similar Messages

Maybe you are looking for