It will become hidden in your post, but will still be visible via the comment's permalink. The following command restores the control file on the physical standby database by using the primary database control file: After this step, the location and names of the datafiles in the standby controlfile are those of the primary database. This is what we can see from the Oracle Doc ID 1987763.1 regarding Recover standby from Service option added in 12.1: Rolling Forward a Physical Standby Using Recover From Service Command in 12c (Doc ID 1987763.1), =========================================================================. This example assumes that the DB_UNIQUE_NAME of the primary database is MAIN and its net service name is primary_db. As better explained under this post from redgate we still missing a step, since the standby controlfile still not updated. Create a control file for the standby database on the primary database. Change). The content of information is very informative.Workday Online TrainingOracle Fusion HCM Online TrainingOracle Fusion SCM Online TrainingOracle Fusion Financials Online Training, python online training in hyderabad python online training hyderabad, Synchronizing the standby and primary databases can be done in many ways. You can do this by adding an entry corresponding to the primary database in the tnsnames.ora file of the physical standby database. Cancel managed recovery of the standby database and apply incremental backup to the standby database. If the production database becomes unavailable because of a planned or an unplanned outage, Data Guard can switch a standby database to the production role, minimizing the downtime associated with the outage. If yes, these datafiles need to be restored on the standby from the primary database. If one or more files are returned in Step 11, then restore these datafiles from the primary database as in step 12. Built on Forem the open source software that powers DEV and other inclusive communities. Once suspended, project42 will not be able to comment or publish posts until their suspension is removed. From the above example, when comparing the SCN of the datafiles header on the primary (PRIM) and standby (CLONE), we see that whereas the SCN of datafiles 5 and 7 match that of primary, the rest of the datafiles (1,3,4,6,8,9,10,16,17) of the standby are lagging behind the primary database. Use the current SCN returned in step 4 to determine if new data files were added to the primary database since the standby database was last refreshed. The FROM SERVICE clause specifies the service name of the primary database using which the physical standby must be rolled forward. Moreover, the performance of production database can be improved by offloading resource-intensive backup and reporting operations to standby systems. Creates an incremental backup containing the changes to the primary database. If the latter, you will have to switch each individual datafile whose location/name are different than that of the primary. check the location and datafile names of the standby datafiles by executing the following: Check incarnation of primary and standby database. Since the controlfile is restored from PRIMARY the datafile location names in this restored STANDBY controlfile will be same as those of the PRIMARY database. Shutdown the standby instance that was started earlier before the restore of the controlfile and start the complete standby database in MOUNT state. RMAN takes a backup of the corresponding datafile, transfers it over the network to the standby server and restores the file. The views expressed by visitors on this blog are theirs solely and may not reflect mine. This is required to determine, in a later step, if new data files were added to the primary database. Lets check the sync status of the standby database with the primary database. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. As better explained under this post from redgate we still missing a step, since the standby controlfile still not updated. With you every step of your journey. This means, that the archive log sequence 219 to 221 contain the changes that need to be applied to these 5 (1,3,4,6,8) datafiles. Start managed recovery of standby database. Step by Step how to setup Oracle Wallet to avoid Keying in the Password or Saving the Password in an Script file Are you really concerne Find Your Exadata Machine Version Are you really curious to see which version of Exadata you are using. Any opinion or mistake are my own :), Rolling Forward a Physical Standby using Recover From Service command [12.1 feature], Creating Oracle Real Application Clusters with Vagrant, Creating a Standby on 21c [Single Instance], How to install Oracle Linux Automation Manager (aka Oracle Ansible Tower), Oracle DBA A lifelong learning experience. We're a place where coders share, stay up-to-date and grow their careers. 11. (LogOut/ Catalog the backups (copied from the primary) into the standby controlfile. All changes to data files on the primary database, beginning with the SCN in the standby data file header, are included in the incremental backup. As you can see, its always desirable to have standby database synchronized with the primary database. From the below outcome, it can be noticed that RMAN is skipping datafiles 5,7,30 and 31 as they have the same checkpoint change# across the primary and the standby sites and restoring only datafiles 1,3,4,6 and 8. To refresh the physical standby database with changes made to the primary database: Ensure that the following prerequisites are met: Oracle Net connectivity is established between the physical standby database and the primary database. It enables production Oracle databases to survive disasters and data corruption. (For Active Data Guard only) Perform the following steps to recover redo data and open the physical standby database in read-only mode: Start the managed recovery processes on the physical standby database. - Start RMAN and connect as target to the physical standby database. Mount the standby database with newly created standby control file. Secondly, RMAN is clever enough to restore only those datafiles whose checkpoint change# on the standby database is different from that of the primary database. You will need at least the difference in free space size. Once unpublished, all posts by project42 will become hidden and only accessible to themselves. This is what we can see from the Oracle Doc ID 1987763.1 regarding Recover standby from Service option added in 12.1: Rolling Forward a Physical Standby Using Recover From Service Command in 12c (Doc ID 1987763.1), =========================================================================. identify the datafiles on standby database which are out of sync with respect to primary. Synchronize Physical Standby Database Using RMAN I Network Issues bezween Primary and standby database, Corruption / Accidental deletion of Archive Redo Data on Primary. Applies the incremental backup to the physical standby database. ok so far so good then whats new with 12c. This command does the following: First, we stop transport from out Primary (db121), Now, we execute couple of log switches to make sure we have higher squences in primary, We can compare the latest Squence from Primary and standby, Lets delete de archivelog. you can use this method, even if you accidently deleted the archivelog from backup that was not even backedup, Copy the incremental backup to the standby host. In 12c, this procedure has been dramatically simplified. Copy the incremental backup to the standby host. If one or more files are returned above, then restore these datafiles from the primary database, For example, assume datafile 21 was returned by the query, Update the names of the online redo logs and standby redo logs in the standby control file using one of the following methods, reference: Rolling Forward a Physical Standby Using Recover From Service Command in 12c (Doc ID 1987763.1). The views expressed here are my own and do not necessarily reflect the views of any other individual, business entity, or organization. This command, recovers the target database (standby database) from the service name that you specify (primary database). When the incremental rollforward is executed, it will apply the newly added blocks to the standby datafiles. Just follow the step and you a runcluvfy.sh stage -pre crsinst -n node1,node2 -fixup -verbose Cluster Verification Pre Installation check failed. Applies the incremental backup to the physical standby database. - database in the tnsnames.ora file of the physical standby database. In the prior versions, we had to initially take an incremental backup of the primary database from the SCN where the standby was stalled and then on copy these backup pieces to the standby server and recover the standby using them. This is a great feature in 12c, where as in prior versions, we had to manually take the incremental SCN backup of the entire primary database, manually ship the backups to the standby site and then recover. Your email address will not be published. Cancel managed recovery of the standby database and apply the incremental backup on the standby database. The syntax would be as recover databasefrom service. Now, due to missing archives on the primary, there has been a gap detected on the standby and its waiting for log sequence 219 of thread 1. Once unpublished, this post will become invisible to the public So, now the datafiles have been restored and recovered, but remember that the controlfile needs to be updated. estore the standby control file by using the control file on the primary database using service ORCL. The password files on the primary database and the physical standby database are the same. The details of the primary and standby instances are as follows: On the primary, the last sequence generated is 217 and 175 for thread 1 and 2 respectively.
Start managed recovery of standby database. Since they are not applied in the standby, we will need to use FORCE option, lets enable transport in primary and confirm the Standby is waiting for those logs, creating what is call a GAP, Lets stop the recovery process and restart the Standby Database as Mounted, We can start now the recovery process from RMAN. Change). Always searching for new things to learn and new questions to ask. If the primary and standby have identical structure and datafile names, this step can be skipped. The DB_UNIQUE_NAME of the standby database is STANDBY and its net service name is standby_db. In 12c, this procedure has been dramatically simplified. Shivananda Rao P, 2012 to 2018. Start managed recovery of standby database. Copy the incremental backup to the standby host. For that, lets restart the system as "nomount", restore the controlfile from primary using "restore standby controlfile from service" command and restart the standby again, An additional step I needed to execute was to mount the database, catalog the datafiles since the location from primary and Standby are different and then switch to copy, Is also necessary to clear up the standby redolog to avoid issues. Made with love and Ruby on Rails. Lets check the SCNs of the datafiles at primary and standby now. The following example rolls forward the physical standby database using the primary database whose service name is primary_db.
12. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Create a free website or blog at WordPress.com. All changes to data files on the primary database, beginning with the SCN in the standby datafile header, are included in the incremental backup. This has reduced the multi steps of manual method of rolling forward a standby database. Since that we have restored the controlfile from the primary database, the datafiles locations will still be pointing to the location of the datafiles that we have on the primary site. Change), You are commenting using your Facebook account. and only accessible to Project-42. As you are aware that rolling forward a physical standby via an incremental SCN backup method is the simplest method of getting your standby database with lag into sync with the primary database. If the datafiles locations on the primary and standby database are different, then you may have to follow this step.
If you are not connected to a recovery catalog, then use the following commands to restore data files that were added to the primary after the standby was last refreshed. (LogOut/ For further actions, you may consider blocking this person and/or reporting abuse. i.e. 1. To achieve this, stop the standby database and start one instance of it in nomount state. /*$ rman target /RMAN> RESTORE STANDBY CONTROLFILE FROM SERVICE ORCLP;*/This will be fine if both primary and standby file location is same, otherwise, needs to take out noredo syntax in recover database from service command. The following commands connect as TARGET to the physical standby database and as CATALOG to the recovery catalog. An individual command will be executed for each logfile member. ORA-16629: database reports a different protection level from the protectionmode , Configuring TDE in 12.1 RAC database with dataguardenabled, Configuring TDE in 11.2 RAC database with dataguardenabled. From above, we can see that the primary and standby datafiles SCNs are now matching. Lets move on in rolling forward a physical standby database. If not, there will be lot of corrections required to do online, standby redo log file location as well as data file location. Let us identify the datafiles on standby database which are out of sync with respect to primary. Use the following steps to refresh the physical standby database with changes made to the primary database: - Oracle Net connectivity is established between the physical standby database and the primary database. 8. But here, RMAN does in one single command. 6. The following command starts the managed recovery process: When using Data Guard Broker, use the following command to start the managed recovery process: Oracle Database Net Services Administrator's Guide for information about establishing Oracle Net connectivity, Parent topic: Refresh and Switchover to the Physical Standby Oracle Database, Migrating Non-CDBs to New Hardware with the Same Operating System and Release, Refresh and Switchover to the Physical Standby Oracle Database, Steps to Refresh a Physical Standby Database with Changes Made to the Primary Database. Cancel managed recovery of the standby database and apply the incremental backup on the standby database. If the primary and standby have identical structure and datafile names, this step can be skipped. Create ASM Disk Group Step1: Set ASM Environment and Login to your ASM instance as sysasm [oracle@node2 ~]$ export ORACLE_HOM recover managed standby database using current logfile disconnect; In 12c, this procedure has been really simplified. However, the standby control file still contains old SCN values which are lower than the SCN values in the standby datafiles. Excellent blog I visit this blog it's really awesome. Execute: 13. Use the current SCN to determine if new data files were added to the primary database since the standby database was last refreshed. alter system set log_archive_dest_status_2=enable; Error: ORA-16724: cannot resolve gap for one or more standby databases, Note:- if you are not using broker you can verify the staus from primary and standby database from v$database, v$managed_standby and v$archive_gap views as well. Stop the managed recovery processes on the physical standby database.
They can still re-publish the post if they are not suspended. Here, /u01/app/oracle/oradata/clone is the location of the data files on the physical standby database. Create a control file for the standby database on the primary database. After that, we will see how the DB can be restarted and will be on sync with the Primary: In summary, we will need to following steps: Stop the Recovery process and restart database as MOUNTED, Execute "RECOVER DATABASE FROM SERVICE" from RMAN, Excute "RESTORE STANDBY CONTROLFILE FROM SERVICE" from RMAN, Mount the standby (from RMAN or restarting it with Mount option), Catalog/Switch to copy if your datafiles are in different location than primary, So, even thouigh we still have some different steps to follow and is not an fully automatic process, we get rid of the process of makig a backup from Primary, transport the backup to the standby system etc. https://onlinedbalearning.blogspot.com/.
In my environment, the datafiles of the standby are placed in +DATA/SRPSTB location. This is an indication that either you have not cataloged all your standby datafiles OR some of your standby datafiles location/name is the same as the primary. Are you sure you want to hide this comment? For that, lets restart the system as "nomount", restore the controlfile from primary using "restore standby controlfile from service" command and restart the standby again, An additional step I needed to execute was to mount the database, catalog the datafiles since the location from primary and Standby are different and then switch to copy, Is also necessary to clear up the standby redolog to avoid issues. This command does the following: First, we stop transport from out Primary (db121), Now, we execute couple of log switches to make sure we have higher squences in primary, We can compare the latest Squence from Primary and standby, Let's delete de archivelog. Mount the standby database with newly created standby control file. 3. Update the names of the data files and the temp files in the standby control file. If the switch database to copy command fails with the RMAN-06571: datafile .. does not have recoverable copy error. No Problem you are at right place then. (Oracle Active Data Guard only) Perform the following steps to open the physical standby database: On the primary database, switch the archived redo log files using the following command: On the physical standby database, run the following commands: Start the managed recovery processes on the physical standby database by using the following command: "Communication error with the OPMN server local port" When Starting OPMN, How to Check and Set max size of PDB storage, How to Shrink the Datafile of Temporary Tablespace in Oracle, Queries to Find Information and Work with Oracle container database (CDB) and pluggable database (PDB), How To Shrink A Temporary Tablespace in Oracle, How to Restore and Recover Single or multiple datafiles from a PDB database, How to move a Datafile to a different Location on Physical Standby Database, How to setup Transparent Data Encryption (TDE) in Oracle 12c for Non-Pluggable database, How to Create Index Partitions To Ranged Partitioned Table, How to Move Partition Online in Oracle 12c, How to add or modify Printer settings in CentOS/RHEL using GUI, Determine the necessary SCN of the standby. - The COMPATIBLE parameter in the initialization parameter file of the primary database and physical standby database is set to 12.0 or higher.
The RECOVER FROM SERVICE command refreshes the standby data files and rolls them forward to the same point-in-time as the primary. The environment is of a 2 node Primary database and a 2 node standby database which uses ASM as a storage media and has the broker configuration enabled (not mandatory). In 12c, you can use the RECOVER FROM SERVICE command to synchronize the physical standby database with the primary database. 2. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Sysman link error when installing Oracle Database 11g(11.2.0.4), Site with Airfields and Weather Information, Oracle DBA A lifelong learning experience. From the above outcomes, its clear that datafiles 1,3,4,6 and 8 have a different checkpoint change# value on the standby when compared to the corresponding files on the primary database. (LogOut/ The net service name of the physical standby database is standby_db and that of the recovery catalog is catdb. Connect the standby database through RMAN as target and restore the controlfile from primary using the service clause. Hence we need to restore the controlfile from the primary site. Take an incremental backup on the primary starting from that SCN# of the standby database. Create a control file for the standby database on the primary database. Transfers the incremental backup over the network to the physical standby database. - The password files on the primary database and the physical standby database are identical. This is done by adding an entry corresponding to the primary. Unauthorized use and/or duplication of this material without express and written permission from this blogs author and/or owner is strictly prohibited. Note the current SCN of the physical standby database. This is required to determine, in a later step, if new data files were added to the primary database. Use the following commands to shut down the standby database and then start it in NOMOUNT mode. you can find this scn while executing recover standby database command. (LogOut/ In 12c, you can use the RECOVER FROM SERVICE command to synchronize the physical standby database with the primary database. Prior to 12c, in order to roll forward the standby database using incremental backups you would need to: Determine the necessary SCN of the standby. To rename log files, the STANDBY_FILE_MANAGEMENT initialization parameter must be set to MANUAL. Any opinion or mistake are my own :), Creating Oracle Real Application Clusters with Vagrant, Creating a Standby on 21c [Single Instance]. All changes to data files on the primary database, beginning with the SCN in the standby data file header, are included in the incremental backup. RESTORE STANDBY CONTROLFILE FROM SERVICE ORCLP; recover managed standby database using current logfile disconnect, How to Find the Cluster Log Files in Oracle 12.2, ORA-00261: log 12 of thread 1 is being archived or modified, Oracle Clusterware (RAC) Startup Procedure: Use of GPNP Profile and OLR, ORA-44787: Service cannot be switched into, Oracle 12cR2 How to Setup Oracle Wallets, How to find Exadata database machine version, cluvfy Pre Check for RAC Installation (CVU), ORA-03113: end-of-file on communication channel. Mount the standby database with newly created standby control file. But, with 12c, its different. alter system set log_archive_dest_status_2=defer; select max(sequence#) from v$archived_log; you can also check the same from standby alert log, to simulate the loss of archivelog on primary I identified the archivelogs not shipped on standby and moved them to backup Location. Create a control file for the standby database on the primary database. Update the names of the online redo logs and standby redo logs in the standby control file using one of the following methods: Clear the log files: If above is the case, the standby has access to the primary redo logs, then you must use the ALTER DATABASE RENAME FILE command to rename the redo log files. Applies the incremental backup to the physical standby database. you need to first synchronize the standby before performing the switchover resulting in Switchover will take more time. On the primary: Its clear that the standby is sync with the primary and we are happy to go ! Use the RECOVER STANDBY DATABASE command with the FROM SERVICE clause to refresh a physical standby database with changes that were made to the primary database. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. If the datafiles on primary have autoextended, the standby datafile would not be same in the size comparison. and so on, rebuilding the complete standby (not recomended) wll always take more time depending on DB size and n/w bandwidth, by copying and applying the archived logs from the primary database, and time consuming process, Some times you may even need to restore the archive from your backup, Applying the incremental backups of the primary database containing changes since the standby database was last refreshed is a faster alternative which will recover the standby database much faster as it will apply only the required changes at standby. Query the V$DATABASE view to obtain the current SCN using the following command: 5. Since they are not applied in the standby, we will need to use FORCE option, let's enable transport in primary and confirm the Standby is waiting for those logs, creating what is call a GAP, Let's stop the recovery process and restart the Standby Database as Mounted, We can start now the recovery process from RMAN. From above, you will observe that the primary and standby datafiles SCNs are now matching or gap is reduced. Connect the standby database through RMAN as target and issue the recover database from service
To overcome this, you need to catalog the standby datafile locations. 7.
If the directory structure is different between the standby and primary databases or if you are using Oracle managed file names OMF, catalog the STANDBY datafiles with RMAN to execute the rename operation. Transfers the incremental backup over the network to the physical standby database. Location of Cluster Logfiles in 12.2 today I just expierenced that the logfiles are no more available under $CRS_HOME/log/node_name Dire drop standby logfile group reportingORA-00261 andORA-00312 -------------------------------------------------- Oracle Database 12c Architecture Oracle Database 12c Architecture Diagram Oracle Database Component Explanation. Change), You are commenting using your Twitter account. Here is a detailed steps of how to roll forward your physical standby database in 11g or 10g. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Working with Oracle Databases since 2012. DEV Community A constructive and inclusive social network for software developers. Depending on the configuration, if the path and names of the standby datafiles after the standby controlfile refresh are correct, steps #9 and #10 can be skipped. The lag can be due to missing archives on the primary which havent been shipped or applied on the standby. Catalog the backups (copied from the primary) into the standby controlfile. Change), You are commenting using your Facebook account. Cancel managed recovery of the standby database and apply the incremental backup on the standby database. Change), You are commenting using your Twitter account. select sequence#, name from v$archived_log where sequence# >90; ---------- ----------------------------------------------------------------, mv /u01/app/oracle/fast_recovery_area/ORCLP/archivelog/2017_08_03/o1_mf_1_95_bfjgx60h_.arc /u01/backup. A standby database is a transactionally consistent copy of the production database. Place the physical standby database in MOUNT mode. Start RMAN and connect as target to the physical standby database. Prior to 12c, in order to roll forward the standby database using incremental backups you would need to: In 12c, this procedure has been dramatically simplified. 