Data Guard :: Disaster Recovery Best Practice With SAN
Mar 29, 2011
I have a SAN systems with primary and secondary interfaces. i need to know what is best practice of oracle to use disaster recovery features, with automatic or manual failover concept.
example.
Primary Server Duty Station 1 New York
Secondary Server Duty Station 2 Los Angelous
requirement : If primary server in DS 1 gets fire and completed get down then secondary server DS 2 should become primary server and reply to client request with AUTO or Manual failover concept.
Do we have any plan to create DR ( disaster site) for ORACLE 10G standard version. Since, Data Guard is not available with Standard version, can we have any another plan for the same.
1.What are the basic things we need to analyze before we recommend the business to go for oracle Dataguard for DR setup?
2. Do you know any technology that will replicate the schema from one datacenter[one primary database ] to another datacenter [secondary or replication database]?
3. What are the various option to configure the disaster recovery plan at schema level?
We have an Oracle application 12.1.1 running with oracle database 10.2.0.4 and we're using HP-UX itanium 11i v3 servers for both application and database, our requirement is to establish a Disaster Recovery site out of our building to ensure data protection.
What is the best option we can use to reduce the cost and to implement the DR site? can we use data guard ? and will be the configurations and requirements for it?
in a RAC multi-node environment with single instance dataguard..Recovery is not running automatically I have to re-run the recovery command to make them sync and this command works for already archived log files no upcoming archive log file applied I have to re-run the recovery command again for newly archived log files.
My standby database was working fine which was running in maximum performance mode .Suddenly i found that logs are not being applied though archived logs are received from primary database.i issued the command in mount mode: alter database recover managed standby database disconnect from session;
altered database this command runs successfully. but MRP process in not initiated which i confirmed with the query (select process,status from v$managed_standby;)
i have done oracle data guard between two databases (database A is the primary) and (database B is the standby), and it was working fine for two weeks, then the network admin did some changes on the firewall on standby side, which made the primary database can not write on standby redo log , so archives was generated on primary and do not generated on standby by, now we solve the firewall probelm and new archives generated on primary is generated on atandby too, but now i have a gap in archives on standby database and standby database now is not synchronized with primary database, and data changes happen on primary is not reflected on standby, also archives that were generated on primary and did not generated on standby during the problem time is not registered in V$ARCHIVED_LOG neither on primary database nor on standby database
I'd like to stop Recovery in specific time. For instance ; My db works Day-1 and Every day Recovery starts 20:00 and finish 05:00. If it is possible that when DB time reach to sync 03:00, I'd like to stop recovery.
I have created dataguard between two instances hosted in two different servers. I have done switchover from primary to standby & then again standby to primary with DGMGRL utility.
1- When I done switchover to primary & trying to open standby database in readonly mode it was giving below error-
ORA-01154: database busy. Open, close, mount, and dismount not allowed now
Why this error was coming ?
2- As I was not able to open standby database in read only mode, I have executed below command-
alter database recover managed standby database disconnect from session;
which return an error as-
ORA-01153: an incompatible media recovery is active
After this I have executed-
alter database recover managed standby database cancel;
which executed successfully.
& then after standby database open in read only mode.
Why above error was coming ?
3- After this I had tried to check the checkpoint_change# & controlfile_change# from primary database and result shows both number were different.
i have found an issue regarding log archiving on dest1. yesterday one sequence number 76871 not archive to dest1.alert logfile content as follow. i configure standby and ship archive manually with window copy command. i need this archive to complete recovery on standby database.
Mon Oct 21 09:29:28 2013 ARC2: Completed archiving log# 3 seq# 76869 Mon Oct 21 09:39:28 2013 Thread 1 advanced to log sequence 76871 Current log# 2 seq# 76871 mem# 0: D:ORACLEORADATAORC1REDO02.LOG [code]....
I noticed that my standby server was behind the prduction one.In the error log I noticed: ORA-00600: internal error code, arguments: [kcbr_apply_change_11], [], [], [], [], [], [], [], [], [], [], []
then MRP0: Background Media Recovery terminated with error 448 Recovered data files to a consistent state at change 286116915
This error happens in sequence: Recovery of Online Redo Log: Thread 1 Group 4 Seq 8830 Reading mem 0I found this archive log in standby and it is same size as in the production one.
I have set the physical standby database to open read mode for a short while.
according to [URL] in order to set db in for from open read-only to applying redo data
Quote:
To change the standby database from being open for read-only access to performing Redo Apply:
Terminate all active user sessions on the standby database. Restart Redo Apply. To start Redo Apply, issue the following statement:
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE 2> DISCONNECT FROM SESSION;
To enable real-time apply, include the USING CURRENT LOGFILE clause:
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE 2> USING CURRENT LOGFILE;
this is what happen
SYS@ngdr> alter database recover managed standby database disconnect session; alter database recover managed standby database disconnect session * ERROR at line 1: ORA-00274: illegal recovery option SESSION SYS@ngdr> alter database recover managed standby database using current logfile;
okay since I encountered the illegal recovery options session, I decided to use alter database recover managed standby database using current logfile; now the session seems to be hanging forever.
We have physical data guard configured version (10.2.0.4). We are in need to upgrade primary & standby database to 11G R2. Can we perform rolling upgrade.
I want to practice partitioning, I have schema which has sales table but that is already partitioned. I want to know if there are some schema available for download which has non partitioned tables and records more than 10000.
I have oracle 10.2.0.4 production database on win 2003 server platform. I need some guidelines about best practice to be followed on oracle database server for Symantec antivirus. *i.e. what are type of files need to be executed?
i have configured physical standby in my local system, to check logshipping i created a table at primary db, wen i tried to check in standby, it says table does not exist..below are primary & standby alert entries..
Primary alert log
Fatal NI connect error 12514, connecting to: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.0.98)(PORT=1522))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=STAND)(SERVER=dedicat ed)(CID=(PROGRAM=d:oracle11gappadministratorproduct11.1.0db_1inORACLE.EXE)(HOST=A960M)(USER=SYSTEM))(SERVER=dedicated))) VERSION INFORMATION: TNS for 64-bit Windows: Version 11.1.0.6.0 - Production
Statspack has been configured for Active Dataguard on Primary database.We got an spike of Buffer busy waits for about 5 min in Active Dataguard, this was causing worse Application SQL's response time during this 5 min window.Below is what i got from statspack report for one hour
Snapshot Snap Id Snap Time Sessions Curs/Sess Comment ~~~~~~~~ ---------- ------------------ -------- --------- ------------------- Begin Snap: 18611 21-Feb-13 22:00:02 236 2.2 End Snap: 18613 21-Feb-13 23:00:02 237 2.1 Elapsed: 60.00 (mins) [code]...
Why there could sudden spike of demand on UNDO data in Active Data Guard ?
I am working in a bank as an system consultant, i have a SAN Storage Area and oracle as below.
SAN 1
This interface includes the DATA FILES of the oracle tablespace
SAN 2
SAN1 Mirrors the DATA FILES of the oracle tablespace to SAN 2
1. Can i rely on real time data recovery from SAN2 ? 2. if SAN1 (Data Files are currupted) will the SAN2 Data Files will be currupted as well. 3. If the SAN2 is currupted then what Oracle Features can be used to have uncurrupted data.
i did everything writen but when i do *SQL>alter database recover managed standby database disconnect from session;*
i go and look in the standby database AlertLog file ,and thats whats writen
*ORA-01157: cannot identify/lock data file 1 - see DBWR trace file ORA-01110: data file 1: 'F:ORACLEPRODUCT10.2.0ORADATADBSYSTEM01.DBF' ORA-27041: unable to open file OSD-04002: غير قادر على فتح الملف O/S-Error: (OS 3) The system cannot find the path specified.
[code]....
strange thing that it realises the primary database in drive F and it goes to it but i dont understand what could be the reason of this ,although im doing this command while primary database is shutdown!
I configure logical standby online .when I execute dbms_logstdby.buid,first
SQL> EXECUTE DBMS_LOGSTDBY.BUILD;
it was blcoked by other sesson,then i kill the holding session,but no work.then i cancel this step and execute it again . the error is
SQL> EXECUTE DBMS_LOGSTDBY.BUILD; BEGIN DBMS_LOGSTDBY.BUILD; END; * ERROR at line 1: ORA-01354: Supplemental log data must be added to run this command ORA-06512: at "SYS.DBMS_LOGMNR_INTERNAL", line 3669 ORA-06512: at "SYS.DBMS_LOGMNR_INTERNAL", line 3755 ORA-06512: at "SYS.DBMS_LOGMNR_D", line 12 ORA-06512: at line 1 ORA-06512: at "SYS.DBMS_INTERNAL_LOGSTDBY", line 370 ORA-06512: at "SYS.DBMS_LOGSTDBY", line 157
I have set up a cross platform (Microsoft Windows IA (32-bit) -> Linux x86 64-bit) data guard and it worked fine.Then I did a switch over (which again worked) and found out the data is not getting replicated at all.. checked the data files available from the new primary database and found out they are in the windows format as below..
SQL> select name from v$datafile;
NAME -------------------------------------------------------------------------------- D:ORACLEAPPADMINISTRATORORADATAMFSSYSTEM01.DBF D:ORACLEAPPADMINISTRATORORADATAMFSSYSAUX01.DBF D:ORACLEAPPADMINISTRATORORADATAMFSUNDOTBS01.DBF D:ORACLEAPPADMINISTRATORORADATAMFSUSERS01.DBF D:ORACLEAPPADMINISTRATORORADATAMFSRMANRMAN_TS01.DBF
and physically they were created at '/home/app/oracle/product/11.2.0/db_1/dbs/' and as
1) scn differs wrt primary in standby (i checked, 1day difference), how to make scn same?
2)i created a table in primary, its not refelecting in standby, (below i ve pasted alertlog entries)
ORA-27041: unable to open file OSD-04002: unable to open file O/S-Error: (OS 2) The system cannot find the file specified. Errors in file d:oracle11gappadministratordiag dbmsstandstand racestand_dbw0_6916.trc: ORA-01157: cannot identify/lock data file 2 - see DBWR trace file ORA-01110: data file 2: 'D:ORACLE11GAPPADMINISTRATORORADATASTANDSYSAUX01.DBF'
[code]....
3)wen i try to open standby database in read only mode gives below error..
ERROR at line 1: ORA-16004: backup database requires recovery ORA-01157: cannot identify/lock data file 1 - see DBWR trace file ORA-01110: data file 1: 'D:ORACLE11GAPPADMINISTRATORORADATASTANDSYSTEM01.DBF'
Our organization has recently decided to go for storage metro cluster solution for disaster recovery. In a Data guard environment, we normally calculate how much archive log is generating and based on that value we calculate the required bandwidth.
For storage metro cluster, we need to find how much block is changing in our primary database, and the same rate of change would apply on DR cluster. Now, i need to give the assumption how much changing is happening in my system. How to calculate the change.
i'm using a mixture of Oracle� Data Guard Concepts and Administration11g Release 1 (11.1) And Bulletin : MAA - Creating a RAC Physical Standby for a RAC Primary 10g ( on oracle support) But neither is comprehensive for what i'm trying to do.
setting up Data Guard Broker on a RAC Data Guard environment?
