When using DataGuard, the logical standby DB is already "OPEN"?

When I was setting up the physical standby DB several years ago no DataGuard got involved), I had the impression that the standby DB is in MOUNT status.
But since when using DataGuard to set up the logical standby DB, the logical standby DB can be used as it is already OPENed.
Is it actually in OPEN status? If so, can the primary and logical standby have the same SID without any trouble?
Please help advise. Thanks a lot!

Hello Christy,
yes it is ok that both database are in status OPEN, that is also the main reason for using logical standby databases (you can do changes and queries on standby too).
I hope you don't use a logical standby database in a SAP environment, because of this is NOT supported. Check sapnote #105047 - Point "14. Data Guard". A logical standby database has limitations.
If you just want to use the physical standby database for queries you can open it in read only or you can use flashback technology for read/write. With Oracle 11g you have these features included in data guard itself (Active Data Guard / Snapshot StandBy) to perform such steps automatically.
Regards
Stefan

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DB_NAME used by the Logical Standby db

Hi all,
It's Oracle 11g R2
I have a general question about converting a Physical standby database to a Logical Standby database.
An important step of the conversion procedure is to issue the following command:
ALTER DATABASE RECOVER TO LOGICAL STANDBY <NEWDBNAME>;
My question is: this statement changes the database name of the Standby database.
How come I still can connect to the new database without having to change the SERVIC_NAME in the tnsnames.ora file?
Here's the connection names used in the file:
db2 =
(DESCRIPTION =
 (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = TCP)(HOST = oradb2.mydomain.com)(PORT = 1521))
 (CONNECT_DATA =
 (SERVICE_NAME = oradb)
)Here's the new db_name:
SQL> SELECT VALUE FROM V$PARAMETER
WHERE NAME LIKE lower('DB_NAME%')
VALUE
ORADBLS
SQL> conn hr@db2
Enter password:
Connected.

If I understand you correctly, you are asking why changing the database name does not necessitate changing the service name? There is no direct relationship between them, you can define any number of service names to register with the listener. By default, there will be a service that does have the same name as the database (possibly with a domain appended) but you do not have to use that one. Query V$ACTIVE_SERVICES and DBA_SERVICES to see what services are available.
Edited by: JohnWatson on Oct 11, 2012 1:50 PM
Sorry - " a service that does have the same name as the database" should read " a service that does have the same unique name as the database"

Why Would The Logical Standby Lag?

Oracle 11.2.0.2
Linux RedHat 5.3+
Logical standby
I have a logical standby that is lagging behind the primary a lot.
The databases have the same amount of data...about 20 million rows.
They have the same indexes.
I am using SQL Apply.
I know that the slow down is that the Logical Standby is doing a full table scan because the update statement contains DECODE statements.
It takes about 19 minutes to process this statement on the Logical Standby.
I know what the offending statement is.
update /*+ streams restrict_all_ref_cons */ "APPLICA"."ARCH" p set "AG_ID"=decode(:1,'N',"AG_ID",:2),
"CREATED_BY"=decode(:3,'N',"CREATED_BY",:4),
"CREATED_ON"=decode(:5,'N',"CREATED_ON",:6),
"DATA_CONTACT_EMAIL"=decode(:7,'N',"DATA_CONTACT_EMAIL",:8),
"DATA_CONTACT_NAME"=decode(:9,'N',"DATA_CONTACT_NAME",:10),
"DATA_CONTACT_PHONE"=decode(:11,'N',"DATA_CONTACT_PHONE",:12),
"DATA_ITEM_ID"=decode(:13,'N',"DATA_ITEM_ID",:14),
"ITEM_ACTION"=decode(:19,'N',"ITEM_ACTION",:20),
"ITEM_DATE"=decode(:21,'N',"ITEM_DATE",:22),
"ITEM_STATUS"=decode(:23,'N',"ITEM_STATUS",:24),
"MESSAGE_TIME"=decode(:25,'N',"MESSAGE_TIME",:26),
"MODIFIED_BY"=decode(:27,'N',"MODIFIED_BY",:28),
"MODIFIED_ON"=decode(:29,'N',"MODIFIED_ON",:30)
where
(:31='N' or
(1=1 and decode(:32,'N','Y',decode(:33,"CREATED_BY",'Y'))='Y'
and decode(:34,'N','Y',decode(:35,"CREATED_ON",'Y'))='Y'
and decode(:36,'N','Y',decode(:37,"DATA_CONTACT_EMAIL",'Y'))='Y'
and decode(:38,'N','Y',decode(:39,"DATA_CONTACT_NAME",'Y'))='Y'
and decode(:40,'N','Y',decode(:41,"DATA_CONTACT_PHONE",'Y'))='Y'
and 1=1 and decode(:46,'N','Y',decode(:47,"ITEM_ACTION",'Y'))='Y'
and decode(:48,'N','Y',decode(:49,"ITEM_DATE",'Y'))='Y'
and decode(:50,'N','Y',decode(:51,"ITEM_STATUS",'Y'))='Y'
and decode(:52,'N','Y',decode(:53,"MESSAGE_TIME",'Y'))='Y'
and decode(:54,'N','Y',decode(:55,"MODIFIED_BY",'Y'))='Y'
and decode(:56,'N','Y',decode(:57,"MODIFIED_ON",'Y'))='Y')) and
(:58="AG_ID") and
(:59="DATA_ITEM_ID")
This table does have indexes but they do not cover the entire table.
Primary Key: AG_ID,DATA_ITEM_ID
Index1 : ITEM_STATUS,AG_ID
I am NOT asking why the statement is doing a full table scan I know that much.
What I am asking is if everthing with the structure, indexes and statistics is the same why is there no problem on the PRIMDB and there is a problem on the STBYDB?

Well I found the issue...I should say a co-worker pointed me to the correct solution.
We were talking about the indexes and primary key and still attempting to understand why to SQL Apply was rewriting my update to include DECODE statments when he said.
"You have the same indexes and primary key but are they USABLE."
Well I thought of course they are usable...I just built the one index and the other is the primary key.
After looking a bit further we found that that index for the primary key was marked as unusable. Then I remembered that when we rebuilt the standby database that I had moved that table to reduce space within the tablespace. Moving a table can invalidate the primary key index. We rebuilt the index on the primary key and all is good now.
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Tim

Upgrade 10.2.0.4 RAC to 11.2.0.2 RAC using a transient logical standby?

Has anyone performed a successful upgrade from 10.2.0.4 RAC to 11.2.0.2 RAC using a transient logical standby? I found one reference to this white paper "http://www.oracle.com/technetwork/database/features/availability/maa-wp-10gr2-transrollupg-168590.pdf" that describes steps to us transient logical standby to upgrade to 11.1.0.6 but I wasn't sure if it also works for upgrades to 11.2.0.2.
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Hi,
I have a 3 node 10.2.0.4 RAC cluster running on rhel 4.8 with a 3 node dataguard physical standby (which the customer want to keep as a physical standby after the upgrade) that I need to upgrade to 11.2.0.2 with as little downtime as possible. This approach seems like a possible solution but I want to know if it is proven.I suggest you to log a S.R and confirm the same.
thanks,
X A H E E R

Best practice on using Flashback and Logical Standby

Hello,
I'm testing a fail-back scenario where I first need to activate a logical standby, then do some dummy transactions before I flashback this db and resme the redo apply. Here is what the steps look like:
1)     Ensure logical standby is in-sync with primary
2)     Enable flashback on standby
3)     Create a flashback guaranteed restore point
4)     Defer log shipping from primary
5)     Activate the logical standby so it’s fully open to read-write
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In the end, i can see the log shipping is happening but the logical standby does not apply any of these..and there is no error in the alert log on Standby side. But the following query could explains why the standby is idle:
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TYPE HIGH_SCN STATUS
COORDINATOR ORA-16240: Waiting for log file (thread# 2, sequence# 0)
ORA-16240: Waiting for log file (thread# string, sequence# string)
Cause: Process is idle waiting for additional log file to be available.
Action: No action necessary. This informational statement is provided to record the event for diagnostic purposes.
I dont understand why it's looking for sequence #0 after the flashback.
Thanks for the help.

Hello;
I hesitate to answer your question because you are not doing a good job of keeping the forum clean :
Total Questions: 13 (13 unresolved)
Please consider closing some of you old answered questions and rewarding those who helped you.
No action necessary.
Do you really have a thread 2? ( Redo thread number )
Quick check
select applied_scn,latest_scn from v$logstdby_progress;Use the DBA_LOGSTDBY_LOG View if you don't have a thread 2 then the sequence# is meaningless.
COLUMN DICT_BEGIN FORMAT A10;
SELECT FILE_NAME, SEQUENCE#, FIRST_CHANGE#, NEXT_CHANGE#,
TIMESTAMP, DICT_BEGIN, DICT_END, THREAD# AS THR# FROM DBA_LOGSTDBY_LOG
ORDER BY SEQUENCE#;Logical Standby questions are difficult, not a lot of them out there I'm thinking.
Check
http://docs.oracle.com/cd/E14072_01/server.112/e10700/manage_ls.htm
"Waiting On Gap State" ( However I still believe you don't have a 2nd thread# )
OR
http://psilt.wordpress.com/2009/04/29/simple-logical-standby/
Best Regards
mseberg
Edited by: mseberg on Apr 26, 2012 5:13 PM

Using streams or logical standby

We are runing Oracle 9.2.0.3.0 and have a requirement to replicate the production database on another server for query and reporting purpose.
The changes can be applied to the reporting database on a daily basis. Of course, the faster the better if there is no additional overhead added on the production database (performance acceptable on the production database).
Do you recommend using Oracle Streams or the logical standby database and why? which one is more stable now?
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Hi,
there is no difference on the primary site between ADG and normal DG. And there is also no difference in shipment of the redo logs.
The apply performance on the standby is minimally slower (< 2%) and only recognizable if you already have problems that the standby keeps up to date. But then again this does not effect your DR.
It only means that a switchover/failover will take minimally longer....
On the other side, there is always headroom to optimize apply performance. See here:
http://www.oracle.com/technetwork/database/features/availability/maa-wp-11gr1-activedataguard-1-128199.pdf
Regards
Sebastian

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When using DataGuard, the logical standby DB is already "OPEN"?

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