Archive gap between primary and standby

Hi,
I've a production environment with 2node RAC with ASM as primary and standalone standby with datafiles stored on the filesystem.
Always on the standby side, there is only one archive gap on the standby end, it is not applying it even after arrival of the archivelog.
How to overcome it?
Thanks

Hello;
Depending upon the query you are using "Real time apply" might show as 1 log behind. Is this possible?
Example from mine :
STANDBY               SEQUENCE# APPLIED    COMPLETIO
STANDBY2                 10711 YES        31-MAY-12
STANDBY2                 10712 YES        31-MAY-12
STANDBY2                 10713 YES        31-MAY-12
STANDBY2                 10714 YES        31-MAY-12
STANDBY2                 10715 YES        31-MAY-12
STANDBY2                 10716 YES        31-MAY-12
STANDBY2                 10717 YES        31-MAY-12
STANDBY2                 10718 YES        31-MAY-12
STANDBY2                 10719 YES        31-MAY-12
STANDBY2                 10720 YES        31-MAY-12
STANDBY2                 10721 YES        31-MAY-12
STANDBY2                 10722 YES        31-MAY-12
STANDBY2                 10723 YES        31-MAY-12
STANDBY2                 10724 YES        31-MAY-12
STANDBY2                 10725 NO         01-JUN-12     So sequence 10725 is still in progress so it shows 'NO'.
Can you post the query you are using?
Best Regards
mseberg
Edited by: mseberg on Jun 14, 2012 7:28 AM

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V$dataguard_stats showing 8 hrs delay between Primary and standby

Hello All,
My Primary and standby database are in sync but v$dataguard_stats on standby server showing 8 hrs delay between Primary and standby.
DB Version:11.2.0.1.0
Server :AIX
Primary:
SQL> select /*+ FULL(c) PARALLEL(c, 35) */ distinct SEQUENCE# "Last Sequence Generated" FROM V$ARCHIVED_LOG c WHERE (THREAD#,FIRST_TIME ) IN (select /*+ FULL(c) PARALLEL(c, 35) */ THREAD#,MAX(FIRST_TIME) FROM V$ARCHIVED_LOG c GROUP BY THREAD#);
Last Sequence Generated
                   4521
Standby:
SQL> SELECT APPL.SEQUENCE# "Last Sequence Applied"
FROM (SELECT THREAD# ,SEQUENCE# FROM V$ARCHIVED_LOG WHERE (THREAD#,FIRST_TIME ) IN (SELECT THREAD#,MAX(FIRST_TIME) FROM V$ARCHIVED_LOG GROUP BY THREAD#)) ARCH,
2    3 (SELECT THREAD# ,SEQUENCE# FROM V$LOG_HISTORY WHERE (THREAD#,FIRST_TIME ) IN (SELECT THREAD#,MAX(FIRST_TIME) FROM V$LOG_HISTORY GROUP BY THREAD#)) APPL
4 WHERE ARCH.THREAD# = APPL.THREAD#;
Last Sequence Applied
                 4521
SQL> SELECT ARCH.THREAD# "Thread", ARCH.SEQUENCE# "Last Sequence Received", APPL.SEQUENCE# "Last Sequence Applied", (ARCH.SEQUENCE# - APPL.SEQUENCE#) "Difference"
2 FROM (SELECT THREAD# ,SEQUENCE# FROM V$ARCHIVED_LOG WHERE (THREAD#,FIRST_TIME ) IN (SELECT THREAD#,MAX(FIRST_TIME) FROM V$ARCHIVED_LOG GROUP BY THREAD#)) ARCH,
3 (SELECT THREAD# ,SEQUENCE# FROM V$LOG_HISTORY WHERE (THREAD#,FIRST_TIME ) IN (SELECT THREAD#,MAX(FIRST_TIME) FROM V$LOG_HISTORY GROUP BY THREAD#)) APPL
WHERE ARCH.THREAD# = APPL.THREAD#;
4
    Thread Last Sequence Received Last Sequence Applied Difference
         1                   4521                  4521          0
SQL> select name, 'Hours', to_number(substr(value,5,2)) from v$dataguard_stats where name = 'apply lag' ;
NAME                             'HOUR TO_NUMBER(SUBSTR(VALUE,5,2))
apply lag                        Hours                            8------------------------------------------------------------------>>>Problem area

SQL> SELECT status, error
FROM V$ARCHIVE_DEST_STATUS
WHERE STATUS <> 'DEFERRED' AND STATUS <> 'INACTIVE'; 2    3
STATUS    ERROR
VALID
VALID
Standby--Generally in Night it happens that primary and standby 'apply lag' is 8/10/4 hrs .When manually checked database are in sync but v$dataguard_stats showing difference in hrs
NAME                             'AL
SUBSTR(VALUE,1,12)
apply lag                        ALL
+00 04:11:03
SQL> SQL>   2
NAME                             'SECOND TO_NUMBER(SUBSTR(VALUE,11,2))
apply lag                        Seconds                             3
SQL> SQL>   2
NAME                             'MINUTE TO_NUMBER(SUBSTR(VALUE,8,2))
apply lag                        Minutes                           11
SQL> SQL>   2
NAME                             'HOUR TO_NUMBER(SUBSTR(VALUE,5,2))
apply lag                        Hours                            4
SQL> SQL>   2
NAME                             'DAY TO_NUMBER(SUBSTR(VALUE,2,2))
apply lag                        Days                            0

Shared FRA disk between Primary and Standby RAC

Hello all,
I need some clarification. Can a ASM +FRADG shared between RAC 2 nodes 11gR2 Primary and RAC 2 nodes 11gR2 Physical Standby Database in order to use it for backup and recovery on both databases.
Thank you.

Hi,
If you are looking this document:
http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmcon.htm#OSTMG94055
Then I understand it that you can use ASM diskgroups only inside same Oracle Clusterware.
So if you have two separate RAC clusters (two separate Oracle Clusterware) then you cannot share ASM between those.
And I don't think it would be wise even if it would be possible.
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Also disk/diskgroup maintenance jobs might be difficult in that kind of configuration.

Switching between Primary and Standby database

Hi,
I managed to setup a standby database that is updated by the primary db either when doing a log file switch or when changing the role of the primary db to standby.
Now I want to put the standby database (that was in primary role for a short period) back into its standby role. I entered
"Alter database commit to switchover to physical standby with session shutdown;"
The archived redo logs as well as the control file are updated on the primary database (which was in standby role for the same short period). When I enter
"Alter database commit to switchover to primary" I am receiving the following error message:
SQL> alter database commit to switchover to primary;
alter database commit to switchover to primary
ERROR at line 1:
ORA-16139: media recovery required
After issuing the recovery statement I get this message:
SQL> recover database
ORA-00283: recovery session canceled due to errors
ORA-01610: recovery using the BACKUP CONTROLFILE option must be done
At the same time this log entry is written into the alert log:
Database not available for switchover
End-Of-REDO archived log file has been received
Archived log files detected beyond End-Of-REDO
Incomplete recovery SCN:0:962365 archive SCN:0:977340
Switchover: Media recovery required - standby not in limbo
ORA-16139 signalled during: alter database commit to switchover to primary...
But when I try to use the BACKUP CONTROLFILE statement during recovery I get this error message:
SQL> recover database using backup controlfile;
ORA-00283: recovery session canceled due to errors
ORA-01666: control file is for a standby database
Although being quite a newbie it's obvious that the primary database (which was standby for a short period) is worried that there are older archived redo logs than online logs. I guess this happens because of the log_archive_dest definition on the standby database :
*.LOG_ARCHIVE_DEST_3='SERVICE=ORAMPPRD REOPEN=60 MAX_FAILURE=3 LGWR SYNC
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=ORAMPPRD'
Changes are applied immediately and only written to the archive.
But how can it be managed that the online redo logs on the primary system are also updated when switching back from standby ???
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Thanks, it's working now.
I think it's important to explizitely follow the steps to switchover standby and primary for it to work. I maybe shutdown the standby to early.
Cheers,
Philipp.

HA SSO doesnt sync certificates between primary and standby

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You need to disable AP SSO and once broken apart, you install the certificate on the HA (secondary). Once you install the cert and reboot the WLC, then you can enable AP SSO.
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How to re-synch primary and standby database?

Hello everyone,
Working on 10g R2/windows server 2003, I have configured a physical standby database but, I have an issue, and don't know how to resolve it.
We were making an update that made some DDL and DML on our application, and for security reason we
1. we ensure that primary and standby are in sync
2. We made a cold backup of the primary database
3. We Deferred the redo shipping between primary and standby
4. We applied changes on primary database
But the big issue is that, for any reason my colleague did the following.
a) made above steps 1,2,3,4
b) after the update he kept the resulted archived log files generated during to another location
c) He restore the cold backup before the update(step 2 above)
c) he applied again the update.
Now the issue is
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At the second update step(c) above another sequence# 553 was created but stored localy in the primary database, because the both servers were deverged (step 3 above).
Technically both servers cannot be in sync again,because sequence# 553 at the first update has next_change# 80307804 and sequenc# 553 at the second update has next_change# 80461356.
Question:
How Can I do to rollback the the first sequence# 553 ( before the first update) on the standby database? in order to apply the sequence#553 generated at the second update and then re-sync both servers to roll forward subsequent sequence#? 554,etc...
Thank you for your help

Hello,
I have just tried the FLASHBACK DATABASE TO SCN XXXXXXXX;
but it doesn't work.
Here are steps used from my local dev envirronnment
From the stand by I retrieved the following information.
SEQUENCE# FIRST_CHANGE# NEXT_CHANGE# FIRST_TIM NEXT_TIME
95 707168 707906 15-AUG-08 15-AUG-08
96 707906 708653 15-AUG-08 15-AUG-08
97 708653 709359 15-AUG-08 15-AUG-08
100 710951 711794 15-AUG-08 15-AUG-08
98 709359 710179 15-AUG-08 15-AUG-08
99 710179 710951 15-AUG-08 15-AUG-08
101 711794 712762 15-AUG-08 15-AUG-08
102 712762 713720 15-AUG-08 15-AUG-08
103 713720 714748 15-AUG-08 15-AUG-08
104 714748 715920 15-AUG-08 15-AUG-08
105 715920 739430 15-AUG-08 15-AUG-08
106 739430 800525 15-AUG-08 16-AUG-08
107 800525 875810 16-AUG-08 17-AUG-08
108 875810 916527 17-AUG-08 18-AUG-08
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> alter database activate standby database; --> prepare to open stby in R/W mode
Database altered.
SQL> startup mount force;
ORACLE instance started.
Total System Global Area 612368384 bytes
Fixed Size 1250428 bytes
Variable Size 180358020 bytes
Database Buffers 423624704 bytes
Redo Buffers 7135232 bytes
Database mounted.
SQL> alter database set standby database to maximize performance;
Database altered.
SQL> alter database open;
Database altered.
SQL> startup mount force;
ORACLE instance started.
Total System Global Area 612368384 bytes
Fixed Size 1250428 bytes
Variable Size 180358020 bytes
Database Buffers 423624704 bytes
Redo Buffers 7135232 bytes
Database mounted.
Now I tried to mimic the flashback database as in the production, to bring it back to sequence# 105 above
SQL> flashback database to scn 739430;
flashback database to scn 739430
ERROR at line 1:
ORA-38754: FLASHBACK DATABASE not started; required redo log is not available
ORA-38761: redo log sequence 75 in thread 1, incarnation 2 could not be
accessed
I'm reverted back the physical standby to its function
SQL> alter database convert to physical standby;
Database altered.
SQL> startup mount force;
ORACLE instance started.
Total System Global Area 612368384 bytes
Fixed Size 1250428 bytes
Variable Size 180358020 bytes
Database Buffers 423624704 bytes
Redo Buffers 7135232 bytes
Database mounted.
SQL> alter database recover managed standby database using current logfile disconne
Database altered.
Verifying if the MRP is up and running: YES see below
SQL> select message from v$dataguard_status;
MESSAGE
ARC0: Archival started
ARC1: Archival started
ARC2: Archival started
ARC3: Archival started
ARC3: Becoming the 'no FAL' ARCH
ARC3: Becoming the 'no SRL' ARCH
ARC1: Becoming the heartbeat ARCH
Attempt to start background Managed Standby Recovery process
MRP0: Background Managed Standby Recovery process started
Managed Standby Recovery starting Real Time Apply
Clearing online redo logfile 1 C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\REDO11.LOG
11 rows selected.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination C:\local_destination1_orcl
Oldest online log sequence 110
Next log sequence to archive 0
Current log sequence 110
So, how can I reslove this issue? without creating the standby from scratch?
Thanks Again for your help

Time zone difference between primary and physical standby

Dear Team,
We have Primary database server (with EST Time zone) and physical standby (with PST time zone), in case of switch over/fail over to physical standby
what are the major impacts.
Is it mandatory to be in time sync?
Thanks in advance
Aj

CURRENT_TIMESTAMP
04-FEB-10 10.22.20.444692 AM +05:30
( above is same on primary and standby)
SQL> select systimestamp from dual;
SYSTIMESTAMP
03-FEB-10 08.52.46.934125 PM -08:00
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One is around Indian subcontinent and other should be in US western region ?
Systimestamp is the timestamp of the OS of the server and hence the difference and the sysdate value will be from systimestamp and if the applications uses SYSDATE then there can be an issue...

Oracle data guard configuration for primary and standby db_name

I am working on configuring an active data guard for one primary DB and one standby DB. I have a few questions:
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hr_boston_01.dbf, fn_boston_01.dbf? In this way, datafile name match up with db_name. but I will create standby log group and members on primary and standby identically. If in future switching over, DB will not have problems.
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can I rename datafiles Yes. The database file names can be changed.
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Normally, for DataGuard, tou can use non-RMAN methods to copy the database but there's no value add in this.
You'd still have to setup DataGuard ! (and I wonder if you'd have complications setting up Active DataGuard).
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Hemant K Chitale

How to sync primary and standby database in 11GR2 on linux

Hi ,
How to sync primary and standby database in 11GR2 on linux . Both my primay and standby are 3 node cluster each.
Can you please suggest a good link and brief steps .
Thanks

Are you trying to setup a new standby or sync an existing standby database?
OK I see it
"standby is behind the primary"
So you have a gap.
I would check both alert logs for a cause. You might find something like this
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor.Look for ORA-00308 and ORA-27037 and ORA-16055.
There's no sense fixing the gap unless the cause is fixed too.
Also check out this post from a few days ago its dealing with similar issues.
How to sync the standby database with the primary?
If you find this helpful please mark it so.
Edited by: mseberg on Jul 20, 2011 4:37 PM

Goldengate between active and standby database server

Hi:
I want to make goldengate connection between active and standby database servers (bidirectional). is it possible?
if yes what steps is required rather than active-active connection.
PLease help!!!
Regards,
Abhishek

What do you mean by "standby" server? If you are referring to a Data Guard standby, how would bidirectional work? That's why one is primary, the other is standby.
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Shell script to find MAX(SEQUENCE#) of primary and standby DB.

Hi All,
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I am looking for a shell script which does the following:
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col logseq_on_standby new_value V_STDBY_LOGSEQ
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from v\$log_history h,
v\$parameter p
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and p.name = 'thread';
Thanks for your time!!
Regards,

sent the shell script..
By the way is this hssawan!!!
Please check the shell script and let me know the following:
AIX 5.3 64bit DB:10.2.0.3.0
I am looking for a shell script which does the following:
Use SQL*Plus to query the MAX(SEQUENCE#) from both databases i.e., Primary and standby V$LOG_HISTORY view. If the STANDBY appears to be falling behind by 2 archive log files,then send alert mail to: [email protected]
We should be able to connect to primary DB from standby DB using ssh
For example: ssh ora<user>@hostname.domain
I use the following query to find out MAX(SEQUENCE#):
col logseq_on_standby new_value V_STDBY_LOGSEQ
select /*+ rule */ max(h.sequence#) logseq_on_standby
from v\$log_history h,
v\$parameter p
where h.thread# = to_number(decode(p.value,'0',1,p.value))
and p.name = 'thread';
Thanks for your time!!
Regards,

Standby database(11g) was still in sync after stopping the primary and standby database listener.

Hello !!!
I have noticed that my standby database(11g) was still in sync after stopping the primary and standby database listener.
If this is the case then how log is transferring from primary to standby ? it is not using listener service ? kindly clarify

Read this Metalink Note:407040.1

Sync config between active and standby CSM

Is there a way to sync config between active and standby CSMs? Just as one that in CSS.
How about two SSL Service module in two different 6500 chassis?
Thanks.

HI,
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Kind regards,
Joerg

Require 9i Primary and Standby redo logs files same size?

Hi,
We have 9.2.0.6 Oracle RAC (2 node) and configured data guard (physical standby).
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Is there a rule, primary and standby database instances have same size redo log files?
If I increase only primary redo log files, is there any side effect? However I try this issue on test system. I increased all primary redo log files(if status='INACTIVE' drop redo log group and add redo log group, switch logfile,...)
, but i couldn't changed standby side. So the system is work well. Is this correct solution or not? How can i increase both sides redo log files?
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Thank you for your helps.. I found this issue answer:
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14239/manage_ps.htm#i1010448
Consequently, when you add or drop an online redo log file at the primary site, it is important that you synchronize the changes in the standby database by following these steps:
If Redo Apply is running, you must cancel Redo Apply before you can change the log files.
If the STANDBY_FILE_MANAGEMENT initialization parameter is set to AUTO, change the value to MANUAL.
Add or drop an online redo log file:
To add an online redo log file, use a SQL statement such as this:
SQL> ALTER DATABASE ADD LOGFILE '/disk1/oracle/oradata/payroll/prmy3.log' SIZE 100M;
To drop an online redo log file, use a SQL statement such as this:
SQL> ALTER DATABASE DROP LOGFILE '/disk1/oracle/oradata/payroll/prmy3.log';
Repeat the statement you used in Step 3 on each standby database.
Restore the STANDBY_FILE_MANAGEMENT initialization parameter and the Redo Apply options to their original states.
bye..

Sequence of stopping starting Primary and standby DB

Hi,
what are the sequence of stopping starting Primary and standby DB ?
To stop, which one ,primary or Standby, should be stopped first ?
To Start which one first ?
Thank you.

Hi,
what about the 10gR2 logical standbys? When I read the Note:278643.1 to apply the patch for logical database, it seemed that the sequence to stop and start the primary/logical standby was to stop the logical standby first before the stop of the primary one. Please advise me, for a simple situation just to stop and start the primary/logical standby to support a Unix server bounce, what is the sequence we should follow ? Do we have to run some commands to stop/start the SQL apply?
Any idea or suggestion will be greatly appreciated.
Thank you very much,
yKe

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