Sizing a standby system for Maximum Availability

- Having primary and secondary sites with the SAME database server configuration. The server configuration will either be a SMP system with lots of processors or a RAC consisting of a number of
4-way SMP processors.
- Data Guard shall be used for the standby "functionality". From a functional point of view, the standby can be either physical or logical.
- The application is very "update/insert intensive" (~50%).
According to the documentation I've read, the recommendation seems to be to use physical standby,
but I am a little worried about performance using
a multiprocessor system for the "Log Apply Service".
If have understood it right, the RMAN process is single-threaded and can only exist in one instance, while the
LSP process manage several processes/execution threads.
Is it therefore possible that logical standby may have greater throughput than physical standby on a SMP system, or is the "Managed Recovery" always more effective".
Will I have problems wichever solution I chose, i.e
are there other "single-threads" that are likely
to become bottlenecks.
/jan

I think in u'r case standby managed will be a secured option b'coze when ever archives get generated it will be applied there won't be a archive loss

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DR Standby System for SCM5.0 Optimizer

Hi,
We are in the way of implementing of DR Standby System for SCM5.0 Optimizer Window base system.
Can anybody help us to build this please?
Thanking you
Regards
Pranav

hi pranav,
i am giving somewat helpfull info pls check it out.
This section describes how you set up a standby database with SAP DB [Page 118]. .... Database Manager GUI (DBMGUI) on Windows-based operating systems .see thsi link
www.sapdb.org/7.4/pdf/usermansapdb_eng.pdf -
www-03.ibm.com/systems/storage/solutions/sap/pdf/sap-dynamiclandscape.pdf -
regards
karthik

ANN: New CMS system for PHP available

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Best - Joe
Joseph Lowery
VP of Product Management, WebAssist
Author, Dreamweaver CS4 Bible

"David Powers" <[email protected]> wrote in message
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Oracle databaguard maximum maximum availability mode

Hi All,
My database is in maximum availability mode at 9.2.0.8:
SQL> select protection_mode from v$database;
PROTECTION_MODE
MAXIMUM AVAILABILITY
SQL> show parameter log_archive_dest_2
NAME TYPE VALUE
log_archive_dest_2 string SERVICE=XXX.world LGWR SYNC
AFFIRM,
SQL>
Oracle Documentation says:
Maximum availability mode provides the highest level of data protection that is possible without affecting the availability of the primary database. This protection mode is very similar to maximum protection where a transaction will not commit until the redo data needed to recover that transaction is written to both the local (online) redo log and to at least one remote standby redo log. Unlike maximum protection mode; however, the primary database will not shut down if a fault prevents it from writing its redo data to a remote standby redo log. Instead, the primary database will operate in maximum performance mode until the fault is corrected and all log gaps have been resolved. After all log gaps have been resolved, the primary database automatically resumes operating in maximum availability mode.
and it also says.....
The NET_TIMEOUT attribute of the LOG_ARCHIVE_DEST_n parameter specifies the number of seconds the log writer process on the primary system waits for status from the network server process before terminating the network connection. The NONET_TIMEOUT attribute reverses or undoes the timeout value that you previously specified with the NET_TIMEOUT attribute.
If you do not specify the NET_TIMEOUT attribute (or if you specify the NONET_TIMEOUT attribute, the primary database can potentially stall. To avoid this situation, specify a small, nonzero value for the NET_TIMEOUT attribute so the primary database can continue operation after the user-specified timeout interval expires when waiting for status from the network server.
If the log writer process detects a network disconnection, even one that was terminated due to a network timeout, the log writer process automatically tries to reconnect to the standby database. The log writer process does this to resolve network brownouts and false network terminations. In most cases, except when the network is physically broken, the log writer process is able to automatically reconnect to the network.
The log writer process continually attempts to reconnect to the standby database for a period of time that depends on the data protection mode currently set for the primary database. Use the following time estimates as a guideline for how long the log writer process will try to reconnect to the standby database:
In maximum protection mode, the log writer process tries to reconnect for approximately 5 minutes.
In maximum availability mode, the log writer process tries to reconnect for approximately 2 minutes.
In maximum performance mode, the log writer process tries to reconnect for approximately 30 seconds.
question is:
1>Does that mean if primary database is in maximum availability mode and if there is network issue and it cannot communicate with standby database, it will freeze or stall for 2 minutes and then operate in maximum performance mode.
That freeze for 2 minutes in production is pain :(
2>Does it also mean,
In maximum performance mode primary database will freeze fro 30 seconds and then move on.
3> To convert from maximum availability to maximum performance do I need to bounce the primary database at 9.2.0.8

I guess I haven't asked the question correctly,
I have asked 2 different question:
1> do you need to mount your database to downgrade the protection mode, I needed confirmation for that at 9.2.0.8
below is link which shows how to downgrade mode:
http://www.idevelopment.info/data/Oracle/DBA_tips/Data_Guard_9i/DG_70.shtml
2> question is all together seperate,
staying in maximum availability mode what happens if you use 'LGWR ASYNC' or 'ARCH' for log shipping.
Why I am asking this question is because, oracle recommends to use 'LGWR SYNC AFFiRM' for maximum availability mode.
I have tried before 'LGWR ASYNC' or 'ARCH' in maximum availability mode and it worked.
Has any one tried 'LGWR ASYNC' or 'ARCH' in maximum protection mode. does db freezes or stalls.
3> When database stalls for 2 miuntes when it cannot connect to dataguard in maximum availability mode, I cannot see any trace files generated, nothing is written in alert log and nothing in listener.log

Creation of a liveCache Standby system with automatic recovery

Hello folks with MaxDB affinity
I'm currently studying the documentation about creating a standby system for a liveCache.
I would like to realize the same scenario as we've already done in our MSSQL environments: for every clustered MSSQL Server, we've created a standby instance, which is feeded via a logshipping job on the cluster side. The standby system recovers the logs automatically with a MSSQL job, too.
So, my finally question: since I found the word document (Standby_DB_MaxDB_eng.doc), which describes this steps in manual, I would like to know, if there's chance to do so automatically?
Our liveCache is a Windows 2003 Server (standby system, too).
Thank you in advance!
Peter

Hi Peter,
just search for "standby + logshipping" in this forum...
Re: Recovery LOG Script
regards,
Lars

Hardware Sizing for high Availability system

Hi,
I have to perform Hardware sizing for high Availability system for a fresh installation and I am quite new to this area.
It will be a User based sizing.
Total user count 150.
105 - Info-consumer Users
40 - Executive Users
05 - Expert Users
Can you please let me know what will be the best approch and what are the factors have to consider to perform the hardware sizing for high Availability system
Your support will be appriciated.
Regards,
Basis

Hi Sebastian,
Thanks for your response. Yes, I am going through the doc.
Solution will be BW 7.4 on HANA. If you can give me what are the factors I have to consider will be very helpfull for me.
I already did sizing for standalone installation, but client is looking for Hardware Sizing for high availability system.
Regards,
Basis

To convert standby from maximum performance to maximum availability

Hi,
I have configured a standby to primary (version:10.2.0). But it is in maximum protection mode. When a logswitch has been done then it is applied at the standby site.
Now I want to convert to maximum availability such that any updation should be applied at the standby.
Can I get the procedure, how should it be done.
thankyou
satyanag

hi
First add standby logfiles to database then follow these commands..
1. set LGWR,SYNC and AFFIRM attributes in the archive destination on primary database.
2. issue this command on primary in mount stage.
ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE AVAILABILITY
3. Then go to standby ..issue this command...(assuming standby in shutdown mode)
a.startup nomount
b.alter database mount standby database.
c. Alter database recover managed standby database using current logfile;
this last command will not return the cursor..it keeps running....
Now u can check by creating a table on primary ...In case any more detail required then please post the message..
hope it works for u..

Availability of the SAP Discovery System for Enterprise SOA

Hello Everybody,
will the SAP Discovery System for Enterprise SOA only be avaliable as a appliance as I've read on NetWeaver04s on Discovery System? Will there be a normal installation like a IDES System?
Perhaps a good idea for a quick start would be a peinstalled Linux Based VMWare Image :-).
Regards
Gregor

Hi Gregor,
among the reasons for shipping the Discovery System as an appliance are legal reasons. So as long as there are 3rd party components involved (from SAP perspective) you'd need to be an official distributor for them. Obviously this restriction applies to VMWare Images as well.
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As always: Making a complex system easy to use/set-up requires extended efforts behind the scenes. So it is always necessary to find the trade-off between "time to market" and "plug-and-play". So currently the availability as appliance is a compromise of both.
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rAimund

IPlanet performance information required (for sizing a new system)

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Hi,
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Choosing a highly-available, networked file system for VM images

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Maybe I will do a little write-up, once we get it all sorted out, since we do experience some strage behaviour of our storages boxes, while ASM hammers ob them quite hardly, but I suspect the raid controllers to blame and not the concept… ;)

HT4623 I am updating my school's operating system for my iPads. I have been able to complete 2 carts of 30 (60 total). The next cart I was able to download the IOS6.3.1 update but it states the install is not available. Good internet connection.

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Hi nytesinger,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots.
Apple Configurator Help: About Apple Configurator
http://help.apple.com/configurator/mac/1.3/#cadf1802aed
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How to customize the program for maximum performance on my system?

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Search help: default value for 'Maximum no of hits'

Hello,
I have a request from a user to change the default value for maximum number of hits in the search help.
Any quick hint?
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Not sure if this is possible and don't have a SAP system available at the moment ...
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or check if the number of hits field has a PARAMETER ID associated with it...
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Maximum Availability to Maximum Performance.

steps to change from Maximum Availability to Maximum Performance.
SQL> select protection_mode from v$database;
PROTECTION_MODE
MAXIMUM AVAILABILITY
we need to come down to maximum performance mode due to some performance issues..any suggestions for the steps?

Hi Raman,
Perform below steps:
1) shutdown immediate
2) Startup mount
3)SQL> ALTER DATABASE SET STANDBY DATABASE TO MAXIMIMUM PERFORMANCE;
4)SQL> ALTER DATABASE OPEN;
Note: Issue all these commands on primary server
Hope this should work
Regards,
X A H E E R

Error Message: "Skype can not start because the system is not available"

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Okay!
I'm newbie here, but it doesn't matter. I dont want to do here anything else, just write off my opinion about the Microsoft's "new" Skype, and I hope they will read...
This is a cropped image - of course hungarian, because I'm hungarian, but I think many of us could see this as well. How this is possible? "The Skype can not start because the system is not available" *** What kind of system? The Skype was on a P2P system, where is impossible that the system is not available! This is why the skype was much better than the Microsoft's messenger. Then they bought it, and make it wrong...
I found a solution for this problem, this can happen if my client is not updated. But IT IS!
How does it works? Can we use the **bleep** Skype how we would like to use? Or this time we need to find an other application (like Viber), and using that while they not buying that as well, just because that is better?
Edited to conform with the Community Guidelines
Subject/title edited to better reflect post content.

Sizing a standby system for Maximum Availability

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