How Real Time Apply works while physical standby is open in Read Only mode

Hi,
With Active data guard option, we can open physical standby DB in read only mode, while redo log are being applied. (Real Time Query)
Standby Redo log (SRL) enables Real Time Apply (with "USING CURRENT LOGFILE" clause in recover database command on standby DB)
I am interested to know, how Real Time Query works ?
What is the mechanism with allows us to open physical standby DB in read only mode while redo logs are being applied continuously ?
Regards,
Sujit

Dear user7419391,
That is a new feature in Oracle Database 11g. MRP can use the real time apply in 10g but the concept here is different.
Taken from the following document;
http://www.ascent.co.za/documents/oracle/Oracle%20databse%2011g%20Active-Data-Guard%20datasheet.pdf
*Unique Advantages of Oracle Active Data Guard*
+Active Data Guard is an evolution of Data Guard technology, providing unique+
+performance advantages while leveraging all other enhancements included in Oracle+
+Data Guard 11g. For example, any Data Guard 11g physical standby database can+
+be easily converted to a Snapshot Standby. A Snapshot Standby is open read-write+
+and is ideally suited as a test system, able to process transactions independent of the+
+primary database. A Snapshot Standby maintains protection by continuing to receive+
+data from the production database, archiving it for later use. When tests are+
+complete, a single command discards changes made while open read-write and+
+quickly resynchronizes the standby database with the primary.+
The other link in the previous post is excellent and you really have to read it to understand the active data guard aspects.
Regards.
Ogan

Similar Messages

It is possible to apply redo while the standby is open in read only mode ?

Hi,
I am using Oracle 11g R2 (11.2.0.1.0)
Step 1: Two node RAC is Configured.
Step 2: One node Data Guard RAC is configured.( i,e Standby is one node RAC).
Primary:
SQL> select open_mode,database_role,PROTECTION_MODE,PROTECTION_LEVEL from v$database;
OPEN_MODE DATABASE_ROLE PROTECTION_MODE PROTECTION_LEVEL
READ WRITE PRIMARY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY
Standby:
SQL> select open_mode,database_role,PROTECTION_MODE,PROTECTION_LEVEL from v$database;
OPEN_MODE DATABASE_ROLE PROTECTION_MODE PROTECTION_LEVEL
READ ONLY WITH APPLY PHYSICAL STANDBY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY
Question:
I have not purchased active dataguard license.
In my case In Data Guard RAC it is possible to apply redo while the database is open in read only mode?
Thanks
Solaiman

876149 wrote:
SQL> select open_mode,database_role,PROTECTION_MODE,PROTECTION_LEVEL from v$database;
OPEN_MODE DATABASE_ROLE PROTECTION_MODE PROTECTION_LEVEL
READ ONLY WITH APPLY PHYSICAL STANDBY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY
"READ ONLY WITH APPLY" in V$DATABASE.OPEN_MODE means Active Data Guard is enabled.
Oracle code cannot check if you have the right license: it is up to you to know which license you have for your database environments.

11gr2 Dataguard Active Standby - Unable to get Real-Time apply working

As above, I am unable to get real time apply to work WITHOUT it switching my standby back to MOUNT state. There does not seem to be anyting obvious from the broker, or alert logs.
On the Standby:
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> alter database open read only;
Database altered.
SQL> select open_mode from v$database;
OPEN_MODE
READ ONLY
SQL> alter database recover managed standby database using current logfile disconnect;
Database altered.
SQL> select open_mode from v$database;
OPEN_MODE
MOUNTED
Primary:-
SQL> SELECT status, recovery_mode FROM v$archive_dest_status where dest_name = 'LOG_ARCHIVE_DEST_2';
STATUS RECOVERY_MODE
VALID MANAGED REAL TIME APPLY
Edited by: Imran on Apr 17, 2012 10:56 PM

Hello;
This is expected.
Works the same exact way on my system. How Redo Data is applied is set when the database is MOUNTED.
See - 6 Redo Apply Services
Data Guard Concepts and Administration 11g Release 2 (11.2) E10700-0
The document is vague on this at best, but think about the error you get if you try to start apply twice.
Data Guard Real-Time Apply FAQ [ID 828274.1]
Best Regards
mseberg
Edited by: mseberg on Apr 17, 2012 10:04 AM
h1. Test
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> alter database recover managed standby database cancel;
Database altered.
SQL> alter database open read only;
Database altered.
SQL> alter database recover managed standby database using current logfile disconnect;
Database altered.
SQL> select open_mode from v$database;
OPEN_MODE
READ ONLY WITH APPLY
SQL> So I get different results ??
Edited by: mseberg on Apr 17, 2012 10:40 AM
h2. Still more
I would like to change my answer. Based on my test and queries as shown below I believe REAL TIME apply is working. Note the last log says NO because its in progress.
Checking last sequence in v$archived_log
STANDBY               SEQUENCE# APPLIED    COMPLETIO
STANDBY                     343 YES        16-APR-12
STANDBY                     344 YES        16-APR-12
STANDBY                     345 YES        16-APR-12
STANDBY                     346 YES        16-APR-12
STANDBY                     347 YES        17-APR-12
STANDBY                     348 NO         17-APR-12
6 rows selected.
----------------Last log on Primary--------------------------------------|
MAX(SEQUENCE#)
           348
1 row selected.Yes, I doubled check and it works on mine. I guess I read what I wanted to read.
All my Standby redo are setup correctly ( size and numbers )
READ ONLY WITH APPLYYour answer my be the Uwe answer at the end of this thread :
Enabling the Active Dataguard and Real Time Apply
Best Regards
mseberg
Edited by: mseberg on Apr 17, 2012 10:50 AM

Excel opens in read only mode on firefox. How do I edit?

If I open an emailed excel document in Firefox it opens as "read only". If I open the same document in Explorer I have the option to edit. How do I get Firefox to allow for editing excel documents?

When you choose Open in the Open/Save/Cancel dialog, Firefox usually uses the Windows TEMP folder. It is safer as cor-el suggests to save the document somewhere else either before or after making your edits. (My understanding of Read Only in Microsoft Office is not that you can't edit, but that you cannot save over the original, so you need to use Save As to save your edits.)

Real - Time Apply some times uses Archived log file

Hi All,
I have a doubt on real time apply in Oracle 10g 10.2.0.4 version where arch process has been configured on primary database and standby has been configured for maximum performance mode with real time apply.
But in standby alert log file i use to find below message rarely
Media Recovery Log /oraclearch/oraarch/ctdr/5548.dbf
Media Recovery Log /oraclearch/oraarch/ctdr/5549.dbfSo my doubt is why archived files are applied as standby has been configured for real time apply where it should apply only from standby online redo log files.
Also i dont find any information on standby database in the view v$standby_log that these standby online log files have been archived in archived column, so how to find how much of data has been written by rfs process on SRL's...
-Yasser

hi,
As the remote file server (RFS) process writes the redo data to standby redo log files on the standby database, log apply services can recover redo from standby redo log files as they are being filled.
please check http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/log_apply.htm
thanks,
baskar.l

ORA-01578 about standby database in read only mode

Hi,
I have an ORA-05178 (data block corrupted) about a standby database which in read-only mode. About production database, there is no problem.
After analyze, this is an index segment :
SELECT segment_name , segment_type , owner , tablespace_name
FROM sys.dba_extents
WHERE file_id = 58
AND 218173 BETWEEN block_id and block_id + blocks -1
SEGMENT_NAME SEGMENT_TYPE OWNER TABLESPACE_NAME
SICINHIS01 INDEX MOWIN IDX_DATA01
There is no constraint.
How can I repair this problem ?
Nicolas

Hi,
I have an ORA-05178 (data block corrupted) about a standby database which in read-only mode. About production database, there is no problem.
After analyze, this is an index segment :
SELECT segment_name , segment_type , owner , tablespace_name
FROM sys.dba_extents
WHERE file_id = 58
AND 218173 BETWEEN block_id and block_id + blocks -1
SEGMENT_NAME SEGMENT_TYPE OWNER TABLESPACE_NAME
SICINHIS01 INDEX MOWIN IDX_DATA01
There is no constraint.
How can I repair this problem ?
Nicolas

After applying FQDN with SSL sharepoint2010 document library's document open as Read Only

Hi,
we have sharepoint server 2010 installed in windows server 2008 R2. We build a document library. After that we installed Office Web Apps. Now,edit in Browser or edit in word/excel etc. all options are working fine.
After that, we configured the site with FQDN (Fully Qualified Doman Name) with SSL. Now, the
edit in browser mode is working fine form both server and client machine (for both windows and form based users).
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The users cannot save the file.
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This post is my own opinion and does not necessarily reflect the opinion or view of Slalom.

How to identify that my physical standby database in use real time apply?

Hi,
Can any one give me the SQL to identifiy that my physical standby database is in real time applying redo logs?
Its urgen please....
Thanks.

You could just look at the alert log. Look for "Recovery of Online Redo Log"
Or you could select from v$standby_apply_snapshot to see if the standby is up-to-date.
select thread#, to_char(snapshot_time,'dd-mon-yyyy:hh24:mi'),
to_char(applied_time,'dd-mon-yyyy:hh24:mi'),
to_char(newest_time,'dd-mon-yyyy:hh24:mi') from V$STANDBY_APPLY_SNAPSHOT;

Starting a Physical Standby DB which is configured with real-time apply

Hi,
I wanted to get clarification on the correct procedure for starting and stopping a physical standby database. The Dataguard documentation states the following:
1. Start and mount the database:
SQL> STARTUP MOUNT;
2. Start log apply services:
To start Redo Apply, issue the following statement:
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE
2> DISCONNECT FROM SESSION;
To start real-time apply, issue the following statement:
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE
2> USING CURRENT LOGFILE;
My configuration is using real-time apply based on the information provided by the RECOVERY_MODE column of the V$ARCHIVED_DEST_STATUS view. Should I execute both ALTER statements or just the second one. If only the second one, how will the database re-synchronize, especially after a long down time. Also, must I do anything on the primary database prior to starting up the physical standby?
I'm using Oracle 10g SP1 on a linux server.

No. But you can recover until the last arch file generated on the primary, then you cancel the recovery and then use query#2 to start applying real-time. Refer to Note:343424.1 on Metalink.

Data guard real time apply vs archived log apply on physical standby

Dear DBA's,
last week i configuared DR , now the phyiscal stanby database is archive apply mode,
i want to confirm is it better to apply the archived log or should i cahnge it to real time apply .
give me sugesstions.
Thanks and Regards
Raja...

One question are you using ARCH transport to move the redo? or have you configured standby redo logs and logwr transport (either async or syncronous), if you are using the archiver to transport the logs then you can not use real time apply.
If you are using log writer to transpor the redo the realtime apply reduces the recovery time required if you need to failover as trher should be less redo to apply to bring the standby up to date, which mode you use to transport redo will depend on what is acceptable in terms of data loss and the impact on performance.

Real-time apply in Maximum Performance Mode Not Working

We have configured physical standby database in maximum performance mode. It's working perfectly fine. Archive logs are being applied to the physical standby.
We can open the DB in read-only mode, but real-time apply is not working. Physical standby database is lagging behind the primary db by an archive log. As soon as primary database generates an archive log, it's transported over to the standby and applied immediately by the media recovery process. But real-time redo is not working. Standby redo logs have been configured.
On Physcial Standby:
SQL> alter database recover managed standby database using current logfile disconnect ;
Database Altered.
SQL> select group#, DBID, status,first_time, last_time from v$standby_log ;
GROUP# DBID STATUS FIRST_TIM LAST_TIME
4 UNASSIGNED UNASSIGNED
5 UNASSIGNED UNASSIGNED
6 UNASSIGNED UNASSIGNED
7 UNASSIGNED UNASSIGNED
SQL> select * from v$dataguard_stats ;
NAME
VALUE
UNIT TIME_COMPUTED
apply lag
+00 00:31:36
day(2) to second(0) interval 22-JUN-2010 08:42:06
transport lag
+00 00:31:34
day(2) to second(0) interval 22-JUN-2010 08:42:06
As you could see from the output above, value of transport and apply lag is equal to the elapsed time since last archive log switch.
********* Standby init.ora
db_name = CPRD
db_unique_name = CPRDS
instance_name = CPRD
service_names = hrDBSBY.WORLD
log_archive_format = CPRD%r%s.%t
log_archive_dest_1 = "location=f:\orarch\hresysprod"
log_archive_dest_2='service=hresysprod async db_unique_name=cprd valid_for=(primary_role,online_logfile)'
log_archive_config='dg_config=(cprd,cprds)'
fal_server=hresysprod
fal_client=hresysprods
standby_file_management=auto
log_archive_trace=1
log_file_name_convert = ('hresysprod','hresysprods')
db_file_name_convert = ('hresysprod','hresysprods')
remote_login_passwordfile = exclusive
******* Primary init.ora
log_archive_config='dg_config=(cprd,cprds)'
fal_server=hresysprods
fal_client=hresysprod
standby_file_management=auto
log_archive_format = CPRD%r%s.%t
log_archive_dest_1 = "location=f:\orarch\hrESYSPROD"
log_archive_dest_2='service=hresysprods async db_unique_name=cprds valid_for=(primary_role,online_logfile)'
log_archive_trace=1
remote_login_passwordfile = exclusive
Please advise.
Thanks,
jay

Hi,
In your case you are using ARC process for redo transfer as you have not specified any process in log_archive_dest_2 and default is arch.
I will suggest you to use LGWR to transfer the redo to standby and also check the size of standby redo logs on standby is same to the size of online redo logs on primary
Regards
Anudeep

Real-time apply cascaded logical standby database

Hi
I have a primary database orcl
Pysical standby database orcl_std
Cascaded logical standby database orcl_tri which receives archivelogs from orcl_std
Real time apply is enabled both in orcl_std (physical standby) and orcl_tri (logical standby)
When I create a table in primary orcl, I am unable to see it on orcl_tri (Although real time apply is enabled)
However, when I switch log in primary, I can see the new table on orcl_tri.
My question is, why realtime apply is not working in my scenerio ?
orcl_std : ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION USING CURRENT LOGFILE;
orcl_tri: ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
Oracle 11.2.0.3.0

Hi mseberg,
Thanks for your reply.
There is no load or network issue as I`ve just created these databases for the experiement.
I have the same output from standby and primary databases.
SQL> select bytes/1024/1024 from v$standby_log;
BYTES/1024/1024
             10
             10
             10I can see below output in standby alertlog
Fri Nov 16 08:39:51 2012
ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE
ALTER DATABASE START LOGICAL STANDBY APPLY (orcl)
with optional part
IMMEDIATE
Attempt to start background Logical Standby process
Fri Nov 16 08:39:51 2012
LSP0 started with pid=37, OS id=16141
Completed: ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE
LOGMINER: Parameters summary for session# = 1
LOGMINER: Number of processes = 3, Transaction Chunk Size = 201
LOGMINER: Memory Size = 30M, Checkpoint interval = 150M
LOGMINER: SpillScn 1953318, ResetLogScn 995548
LOGMINER: summary for session# = 1
LOGMINER: StartScn: 0 (0x0000.00000000)
LOGMINER: EndScn: 0 (0x0000.00000000)
LOGMINER: HighConsumedScn: 1955287 (0x0000.001dd5d7)
LOGMINER: session_flag: 0x1
LOGMINER: Read buffers: 16
Fri Nov 16 08:39:55 2012
LOGMINER: session#=1 (Logical_Standby$), reader MS00 pid=30 OS id=16145 sid=49 started
Fri Nov 16 08:39:55 2012
LOGMINER: session#=1 (Logical_Standby$), builder MS01 pid=39 OS id=16149 sid=44 started
Fri Nov 16 08:39:55 2012
LOGMINER: session#=1 (Logical_Standby$), preparer MS02 pid=40 OS id=16153 sid=50 started
LOGMINER: Turning ON Log Auto Delete
LOGMINER: Begin mining logfile during commit scan for session 1 thread 1 sequence 202, +DATA/orcl_std/archivelog/2012_11_15/thread_1_seq_202.349.799450179
LOGMINER: End mining logfiles during commit scan for session 1
LOGMINER: Turning ON Log Auto Delete
LOGMINER: Begin mining logfile for session 1 thread 1 sequence 202, +DATA/orcl_std/archivelog/2012_11_15/thread_1_seq_202.349.799450179
LOGMINER: End   mining logfile for session 1 thread 1 sequence 202, +DATA/orcl_std/archivelog/2012_11_15/thread_1_seq_202.349.799450179
Fri Nov 16 08:40:04 2012
LOGSTDBY Analyzer process AS00 started with server id=0 pid=41 OS id=16162
Fri Nov 16 08:40:05 2012
LOGSTDBY Apply process AS03 started with server id=3 pid=45 OS id=16175
Fri Nov 16 08:40:05 2012
LOGSTDBY Apply process AS04 started with server id=4 pid=46 OS id=16179
Fri Nov 16 08:40:05 2012
LOGSTDBY Apply process AS01 started with server id=1 pid=42 OS id=16167
Fri Nov 16 08:40:05 2012
LOGSTDBY Apply process AS05 started with server id=5 pid=47 OS id=16183
Fri Nov 16 08:40:05 2012
LOGSTDBY Apply process AS02 started with server id=2 pid=44 OS id=16171Do you think real-time apply wasnt setup properly ?

ORACLE 11G "real time apply" not work?????

we have a database original on ORACLE 10.2.0.4 and we upgrade it to 11.1.0.7.
after that we create standby database and tried to use "real time apply" feature.
Primary database can transfer log files to standby database and standby database also can apply logs. The problem is it can NOT work on "real time apply".
Ant ideal what wrong?
=== procedures ====== (standby database)
SQL> startup mount;
ORACLE instance started.
Total System Global Area 2087780352 bytes
Fixed Size 2161272 bytes
Variable Size 1795163528 bytes
Database Buffers 251658240 bytes
Redo Buffers 38797312 bytes
Database mounted.
SQL> alter database open read only;
Database altered.
SQL> alter database recover managed standby database using current logfile disconnect;
Database altered.
SQL> select PROTECTION_MODE, PROTECTION_LEVEL, DATABASE_ROLE, SWITCHOVER_STATUS, OPEN_MODE, GUARD_STATUS from v$database;
PROTECTION_MODE PROTECTION_LEVEL DATABASE_ROLE SWITCHOVER_STATUS
OPEN_MODE GUARD_S
MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE PHYSICAL STANDBY NOT ALLOWED
MOUNTED NONE
SQL> select process, status from v$managed_standby;
PROCESS STATUS
ARCH CONNECTED
ARCH CONNECTED
ARCH CONNECTED
ARCH CONNECTED
RFS IDLE
MRP0 APPLYING_LOG
6 rows selected.
========== Primary database init.ora file setup =====
### for DG use
db_unique_name = DBPMY
log_archive_config='dg_config=(DBPMY,DBSBY)'
log_archive_dest_1='LOCATION=/Archive/DBPMY/arch/arch MANDATORY'
log_archive_dest_2='service=DBSBY valid_for=(online_logfiles,primary_role) db_unique_name=DBSBY LGWR ASYNC=20480 OPTIONAL REOPEN=15 NET_TIMEOUT=30'
*.log_archive_format='DBPMY_%r_%t_%s.arc'
log_archive_dest_state_1 = enable
log_archive_dest_state_2 = enable

There are a couple of things to look at.
1. Real time apply requires standby redo logs on the standby database. On the standby database run this query:
SELECT * FROM v$logfile where type = 'STANDBY';
if you get 0 rows back you'll need to create standby logfiles
The general guideline is to size them exactly like your redo logs but add one additional standby log to ensure it doesn't cause a bottleneck.
2. Get the size of your logfiles:
SELECT GROUP#, BYTES FROM V$LOG;
3. For example if you have 3 redo logs that are 50 MB in size, create 4 standby redo logs 50 MB each and don't multiplex them.
ALTER DATABASE ADD STANDBY LOGFILE ('/Archive/DBSBY/onlinelog/slog1.rdo') SIZE 50M;
ALTER DATABASE ADD STANDBY LOGFILE ('/Archive/DBSBY/onlinelog/slog2.rdo') SIZE 50M;
ALTER DATABASE ADD STANDBY LOGFILE ('/Archive/DBSBY/onlinelog/slog3.rdo') SIZE 50M;
ALTER DATABASE ADD STANDBY LOGFILE ('/Archive/DBSBY/onlinelog/slog4.rdo') SIZE 50M;
4. Cancel recovery on standby
recover managed standby database cancel;
5. Restart recovery using real time apply
recover managed standby database using current logfile disconnect;
6. To validate that real time is working you can check a few places.
-It will say in the database alert log on standby that it's using real time apply
OR
-Check primary
SELECT status, recovery_mode FROM v$archive_dest_status where dest_name = 'LOG_ARCHIVE_DEST_2';
If the recovery_mode is "MANAGED REAL TIME APPLY" then real time apply is working, if it's anything else then we'll need to check more things.
NOTE that if you are going to allow your current primary to switch roles and become a standby then you'll want to create standby redo logs on primary as well
Sometimes recovery gets "stuck" and simply resetting the destination parameters can resolve it:
alter system set log_archive_dest_2='service=DBSBY valid_for=(online_logfiles,primary_role) db_unique_name=DBSBY LGWR ASYNC=20480 OPTIONAL REOPEN=15 NET_TIMEOUT=30';
There are some other things we can check next but let's start with the easiest fixes first.

Real time apply for logical standby

Hi
Oracle 11.2.0.3.0
I have a primary database orcl and logical standby database orcl_std.
Real time apply is enabled. I have standby redologs in both primary and standby sides and I`ve started recovery with below command:
ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
When I create a new table in primary database, I am unable to see it on standby database (Although real time apply is enabled)
However, when I switch log in primary, I can see the new table in standby database.
My question is, why realtime apply is not working in my scenerio ? I was expecting to see the new table immediately in standby database once it is created in primary database. Why am I supposed to wait for log switch in real time apply ?

Using Real-Time Apply to Apply Redo Data Immediately
http://docs.oracle.com/cd/E11882_01/server.112/e25608/log_apply.htm#i1022881
1.What is compatible parameter, it should be 11.1
2.Try to check parameters mentioned in below link:
http://easyoradba.com/2011/01/10/real-time-apply-in-oracle-data-guard-10g/
Regards
Girish Sharma
Edited by: Girish Sharma on Nov 15, 2012 12:37 PM

Logical standby real time apply problem

Hi all,
The real time apply for logical standby on my Oracle 10.2 DB is not working
SELECT SEQUENCE#, FIRST_TIME, APPLIED
FROM DBA_LOGSTDBY_LOG
ORDER BY SEQUENCE#;
SEQUENCE# FIRST_TI APPLIED
2113 07/10/09 NO
2115 07/10/09 NO
2116 07/10/09 NO
There is no error inside alert log.
Any help
Thanks

Using Real-Time Apply to Apply Redo Data Immediately
http://docs.oracle.com/cd/E11882_01/server.112/e25608/log_apply.htm#i1022881
1.What is compatible parameter, it should be 11.1
2.Try to check parameters mentioned in below link:
http://easyoradba.com/2011/01/10/real-time-apply-in-oracle-data-guard-10g/
Regards
Girish Sharma
Edited by: Girish Sharma on Nov 15, 2012 12:37 PM

How Real Time Apply works while physical standby is open in Read Only mode

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