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I press return key to accept the default path but got this error message: ORA-00308: can not open archive log. I checked the property of the file and it is NOT read-only. I don’t know why Oracle cannot open it. I changed it to the ARCHIVELOG mode.With the new remote archival feature, archive logs can be automatically applied on the remote (standby) host. To fully automate the process of recovering (rolling forward) the standby database, the DBA can put the database into sustained recovery mode ( New in Oracle8i): The server process wakes itself internally every 15 seconds to check for archival of the next required log. The DBA can also specify a timeout period (minutes) for sustained recovery. If no new logs are generated within this period, the recovery session is cancelled. Refer to Oracle 8i STANDBY DATABASE CONCEPTS AND ADMINISTRATION Part No. A76995-01 for how to resolve this. Create your account to get started. Newsletters may contain advertising. You can unsubscribe at any time. You might choose manual recovery mode for any of the following reasons: It includes the following topics: This procedure assumes that you plan to connect to the standby database through Oracle Net. If you do not want to use Oracle Net to connect to the standby database, skip steps 4 and 5. To keep the standby database current, you must manually apply archived redo logs from the primary database to the standby database. Figure B-1 shows a database in manual recovery mode. For example, enter: A non-Data Guard environment is one in which you manually: For example, you might choose to manually resolve an existing archive gap by using manual recovery mode. This section contains the following topics: See Section 6.4 for more information about how log apply services automatically recover from gaps in the redo logs. Because the standby database requires the sequential application of redo logs, media recovery stops at the first missing log encountered.
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For example, if the standby database is made from a backup that contains changes through log 100, and the primary database currently contains changes through log 150, then the standby database requires that you apply logs 101 to 150. Another typical example of an archive gap occurs when you generate the standby database from a hot backup of an open database. For example, you must shut down the standby database when you change a control file parameter, such as MAXDATAFILE, in the primary database. Consequently, the Oracle database server can create an archive gap. Otherwise, the primary database eventually stalls because it cannot archive its online redo logs. In this situation, archived logs accumulate as usual on the primary site, but the standby instance is unaware of them. If the archiving destination is mandatory, then the primary database will not archive any logs until it is able to archive to the standby site. For example, you can set the following in the primary initialization parameter file to make standby1 a mandatory archiving destination: This problem is exacerbated if you maintain only two online redo logs in your primary database. If there is no archive gap for a given thread, the query returns no rows. Before transmitting the archived logs to the standby site, determine the correct filenames for the logs at the standby site. For example, assume you have the following archive gap: You need to copy logs from threads 1, 2, and 3. After connecting to the primary database, issue a SQL query to obtain the name of a log in each thread. For example, use the following SQL statement to obtain filenames of logs for thread 1: For example, enter: The reason is that the recovery process does not know about the logs archived to the standby site by the primary database. For example, you might see: For example, assume that your database has the following datafiles, which you want to rename as shown in the following table. To fix this problem Bookmark the permalink.
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Maybe with a batch file who finds the gap sequence and regists it using the ALTER DATABASE REGISTER LOGFILE? To find out more, including how to control cookies, see here. If you use ftp make sure the transfer is done in binary mode. We assume here that the redo files are going to the same location on the standby server. At this point cancel the recovery, e.g. But if for some reason you have to do it manually once-off, you have two options: Dbvisit Standby Database Technology (7.0.03.11530) (pid 20968)Sending heartbeat message. - done. Log file(s) for devdb from dbvlin501 will be applied to dbvlin502. No new logs to apply.Recovery Manager: Release 10.2.0.1.0 - Production on Sun Jan 5 16:38:56 2014. Copyright (c) 1982, 2005, Oracle. All rights reserved.Do you really want to catalog the above files (enter YES or NO)? YESRMAN-06054: media recovery requesting unknown log: thread 1 seq 5250 lowscn 14528020This can be ignored in this case. Submit a request. However, for Oracle SE and manual standby, have fun searching. All rights reserved. Connected to. Oracle Database 11g Release 11.2.0.4.0 - 64bit ProductionSystem altered. Database log mode Archive Mode. Automatic archival Enabled. Oldest online log sequence 44. Next log sequence to archive 46. Current log sequence 46All rights reserved. Connected to. Oracle Database 11g Release 11.2.0.4.0 - 64bit Production. ORA-27037: unable to obtain file status. Additional information: 3Media recovery cancelled.System altered. Database log mode Archive Mode. Automatic archival Enabled. Oldest online log sequence 45. Next log sequence to archive 47. Current log sequence 47All rights reserved.List of Files Unknown to the DatabaseList of Cataloged FilesAll rights reserved. Connected to. Oracle Database 11g Release 11.2.0.4.0 - 64bit Production. ORA-27037: unable to obtain file status. Additional information: 3Media recovery cancelled.Database closed. Database dismounted. ORACLE instance shut down. ORACLE instance started.
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Total System Global Area 1068937216 bytes. Fixed Size 2260088 bytes. Variable Size 281019272 bytes. Database Buffers 780140544 bytes. Redo Buffers 5517312 bytes. Database altered.ALTER DATABASE RECOVER automatic standby database. Media Recovery StartFri Feb 20 11:23:18 2015. Managed Standby Recovery not using Real Time Apply. Parallel Media Recovery started with 2 slaves. Recovery dropped tablespace 'NEW1'. Recovery dropped tablespace 'NEW2'. ORA-27037: unable to obtain file status. Additional information: 3. ORA-279 signalled during: ALTER DATABASE RECOVER automatic standby database.Completed: ALTER DATABASE RECOVER CANCELTrackBack URI Notify me of new posts via email. Learn how your comment data is processed. To find out more, including how to control cookies, see here. During the recovery process, However, the This parameter can be updated dynamically using If the managed recovery process is The following steps show the All legitimate Oracle experts If you find an error. Mount Standby Database 11. Catalog backuppiece 12. Switch logfile (On Primary) 17.DB Version: Oracle 11.2.0.4. File system: Normal. DB Name: DELL. Flashback: DisabledDB Version: Oracle 11.2.0.4. File system: Normal. DB Name: DELL. Flashback: DisabledCopyright (c) 2000, 2009, Oracle. All rights reserved. Connected. Configuration - DELLFast-Start Failover: DISABLED. Configuration Status:Now how to recover standby database without rebuild from scratch ?Database Status:Database - DELLDatabase Status:All rights reserved.Starting backup at 24-JAN-19Finished backup at 24-JAN-19ORA-01109: database not open. Database dismounted. ORACLE instance shut down.All rights reserved. Connected to an idle instance. ORACLE instance started. Total System Global Area 1269366784 bytes. Fixed Size 2252864 bytes. Variable Size 805310400 bytes. Database Buffers 452984832 bytes. Redo Buffers 8818688 bytes. Database mounted.All rights reserved. Starting implicit crosscheck backup at 24-JAN-19Crosschecked 1 objects.
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Finished implicit crosscheck backup at 24-JAN-19. Starting implicit crosscheck copy at 24-JAN-19. Crosschecked 2 objects. Finished implicit crosscheck copy at 24-JAN-19List of Backup Sets. BS Key Type LV Size Device Type Elapsed Time Completion TimeAll rights reserved. Connected to. Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production. With the Partitioning, Oracle Label Security, OLAP, Data MiningMedia recovery complete. Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production. With the Partitioning, Oracle Label Security, OLAP, Data MiningAll rights reserved. Starting recover at 24-JAN-19Finished recover at 24-JAN-19. Recovery Manager complete.ERROR at line 1. ORA-01153: an incompatible media recovery is activeDGMGRL for Linux: Version 11.2.0.4.0 - 64bit Production. Copyright (c) 2000, 2009, Oracle. All rights reserved. Connected. Succeeded.System altered. System altered. Database log mode Archive Mode. Automatic archival Enabled. Oldest online log sequence 429. Next log sequence to archive 431. Current log sequence 431Fast-Start Failover: DISABLED. Configuration Status:Database Status:Automatic archival EnabledNext log sequence to archive 0. Current log sequence 431It is provided for educational purposes only. It has been tested internally, however, we do not guarantee that it will work for you. Ensure that you run it in your test environment before using. Suppose some of the archives hasn’t been shipped to secondary.But due to intermittence error or human error, the archives has been deleted from primary. So without those archives, standby can’t be in sync with primary. In oracle 12c, We can use the rolling forward method to fix it. System altered. System altered. System altered. System altered.Database closed. Database dismounted.Starting backup at 20-SEP-13Finished backup at 20-SEP-13Database altered.ORACLE instance started. Total System Global Area 1068937216 bytes. Fixed Size 2233336 bytes.
Variable Size 813698056 bytes. Database Buffers 247463936 bytes. Redo Buffers 5541888 bytesRecovery Manager: Release 11.2.0.2.0 - Production on Fri Sep 20 09:14:08 2013. All rights reserved.List of Files Unknown to the Database. Do you really want to catalog the above files (enter YES or NO)? yesList of Cataloged Files. Starting recover at 20-SEP-13. ORA-19573: cannot obtain exclusive enqueue for datafile 4. Database altered. Again follow the same process i.e recovering the database. Starting recover at 20-SEP-13RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 251 and starting SCN of Database altered.Database log mode Archive Mode. Automatic archival Enabled. Oldest online log sequence 257. Next log sequence to archive 259. Current log sequence 259. Database log mode Archive Mode. Automatic archival Enabled. Oldest online log sequence 258. Next log sequence to archive 0. Current log sequence 259. This site uses Akismet to reduce spam. Learn how your comment data is processed. This chapter contains the following topics: When used on a physical standby database: You then have the option of either starting Redo Apply or real-time apply, or opening the database for read-only access. When you first start Redo Apply on a newly created physical standby database that has not yet received any redo data from the primary database, an ORA-01112 message may be returned. This indicates that Redo Apply is unable to determine the starting sequence number for media recovery. If this occurs, you must either manually retrieve and register an archived redo log file on the standby database, or wait for the automatic archiving to occur before restarting Redo Apply. Control is not returned to the session that initiates a database shutdown until shutdown is complete. If the MRP0 or MRP process exists, then the standby database is applying redo. Thus, you can reduce the load on the primary database by using the standby database for reporting purposes.
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You can periodically open the standby database for read-only access and perform ad hoc queries to verify Redo Apply is updating the standby database correctly. (Note that for distributed queries, you must first issue the ALTER DATABASE SET TRANSACTION READ ONLY statement before you can issue a query on the read-only database.) At some point, you need to resume Redo Apply on the standby database, and apply the archived redo log files to resynchronize the standby database with the primary database. Because of the additional time required to apply any accumulated archived redo log files, having a standby database open for read-only access can increase the time required to complete failovers or switchovers. By default, the ALTER DATABASE OPEN statement opens physical standby databases in read-only mode. The Oracle database determines if this is a physical standby database based on information in the control file. This section describes these events and the recommended responses to these events. In other cases, you might need to perform maintenance tasks on the standby database. It also briefly describes how to respond to these events. Detailed descriptions of the responses are described in the section references provided. Do not use the following procedure with databases that use Oracle Managed Files.This manual intervention involves ensuring the raw devices exist before log apply services on the standby database recover the redo data that will create the new datafile.On the primary database, create a new tablespace where the datafiles reside in a raw device. At the same time, create the same raw device on the standby database. For example. Tablespace created.The standby alert log shows the following: Successfully added datafile 6 to media recovery. Media Recovery Waiting for thread 1 sequence 8 (in transit)For example, issue the following statements on the primary database. Tablespace created. System altered.Originally created as.
Recovery was unable to create the file as. MRP0: Background Media Recovery terminated with error 1274. Fri Apr 8 10:00:22 2005. ORA-27041: unable to open file. Linux Error: 13: Permission denied. Additional information: 1. Some recovered datafiles maybe left media fuzzy. Media recovery may continue but open resetlogs may fail. Fri Apr 8 10:00:22 2005. ORA-27041: unable to open file. Linux Error: 13: Permission denied. Additional information: 1. Fri Apr 8 10:00:22 2005. MTS; MRP0: Background Media Recovery process shutdown. ARCH: Connecting to console port.Fri Apr 8 10:09:30 2005. Completed: alter database create datafileIf the following query returns the MRP or MRP0 process, Redo Apply is running. For example: For example: For example, to drop the tablespace at the primary site: Redo data will be generated and applied at the standby site to plug the tablespace into the standby database. Consequently, you will see error messages similar to the following in the alert log: You can add or drop online redo log file groups or members to the primary database without affecting the standby database. Similarly, you can drop log file groups or members from the primary database without affecting your standby database. However, these changes do affect the performance of the standby database after switchover. Whenever you add an online redo log file to the primary database, you should add corresponding online and standby redo log files to the standby database. You can specify the SQL ALTER DATABASE or SQL ALTER TABLESPACE statement with the FORCELOGGING clause to override the NOLOGGING setting. However, this statement will not repair an already invalidated database. When an ALTER DATABASE OPEN RESETLOGS statement is issued on the primary database, the i ncarnation of the database changes, creating a new branch of redo data.
For physical standby databases, no manual intervention is required if the standby database did not apply redo data past the new resetlogs SCN (past the start of the new branch of redo data). The following table describes how to resynchronize the standby database with the primary database branch. The MRP automatically resynchronizes the standby database with the new branch of redo data. In addition to providing information about the Oracle database, it also includes information about operations specific to Data Guard, including the following: These views are often called dynamic performance views because they are continuously updated while a database is open and in use, and their contents relate primarily to performance. These views are also called fixed views because they cannot be altered or removed by the database administrator. It contains the following examples: The following query output shows the standby database is two archived redo log files behind in applying the redo data received from the primary database. Some information you can get includes the location of the archived redo log, which process created the archived redo log, redo log sequence number of each archived redo log file, when each log file was archived, and whether or not the archived redo log file was applied. For example: For example, issue the following query: For example: You can then use this destination ID in a query on the primary database to discover log files that were not sent to a particular standby site. You can also monitor the standby database using the Oracle Enterprise Manager GUI. The output also shows that Redo Apply is actively applying an archived redo log file with the sequence number 946. The recovery operation is currently recovering block number 10 of the 72-block archived redo log file. It will contain the value MANAGED REAL TIME APPLY when real-time apply is enabled, as shown in the following example: ARC1: Archival startedARCH: Transmitting activation ID 0.
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LGWR: Completed archiving log 3 thread 1 sequence 11. LGWR: Transmitting activation ID 6877c1fe. LGWR: Beginning to archive log 4 thread 1 sequence 12. ARC0: Evaluating archive log 3 thread 1 sequence 11. ARC0: Beginning to archive log 3 thread 1 sequence 11. ARC0: Completed archiving log 3 thread 1 sequence 11. ARC1: Transmitting activation ID 6877c1feARC1: Archival started. ARC1: Evaluating archive log 6 thread 1 sequence 11. ARC1: Beginning to archive log 6 thread 1 sequence 11. ARC1: Completed archiving log 6 thread 1 sequence 11. Attempt to start background Managed Standby Recovery processAlso, see the Oracle Media Recovery Best Practices white paper for more information:. With parallel media recovery, these data blocks are subsequently distributed evenly to all recovery processes to be read into the buffer cache. The default is serial recovery or zero parallelism, which implies that the same recovery process reads the redo, reads the data blocks from disk, and applies the redo changes. The following examples show how to set recovery parallelism: Block checking should be enabled on the primary database.Increasing this parameter requires more memory from the shared pool by each parallel execution slave process. Legal Notices. This appendix contains the following sections: For example, enter the following query: If any of the following conditions exist, the primary database will fail to archive to the standby site: You must first start the instance and then mount the database. If you specify REOPEN for a MANDATORY destination, the log transport services component stalls the primary database when it cannot successfully archive redo logs. For example: However, if the switchover operation is initially unsuccessful, you might still be able to use one of the following recovery options to complete the switchover operation successfully. If you then start up the managed recovery process, the archived log will be applied automatically.
This trace file contains the SQL statements required to re-create the original primary control file. Locate the trace file and extract the SQL statements into a temporary file. This will revert the new physical standby database back to the primary role. This is necessary to resynchronize the primary database and physical standby database. Copy the standby control file to the original physical standby site. Force a log switch on the primary database and examine the alert logs on both the primary database and physical standby database to ensure that the archived redo log sequence numbers are correct. After both the ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY and the ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY statements are successfully executed, shut down and restart the physical standby database and the primary database.There should be entries for a listener at the standby site and a corresponding tnsname at the primary site. Active SQL sessions can include other Oracle processes. The entries with no process or program information are threads started by the job queue controller. After you shut down the instance and restart it after switchover has completed, the parameter will be reset to the original value. This applies to both primary and physical standby databases. You can take the actions described in Table A-2 to correct the situation and start applying SQL statements to the logical standby database again. If an incorrect SQL statement caused SQL apply operations to fail, transaction information, as well as the statement and error information, can be viewed. The transaction information can be used with other Oracle9 i LogMiner tools to understand the cause of the problem. When the destination is remote, the buffer is written to the archive log location over the network using Oracle Net services. The default transfer buffer size for Oracle Net is 2 kilobytes.
Therefore, the archive log buffer is divided into units of approximately 2 kilobytes for transmission. These units could get further divided depending on the maximum transmission unit (MTU) of the underlying network interface. This parameter can be adjusted to reduce the number of network packets that are transmitted. This parameter allows a range of 512 bytes to 32 kilobytes. This method consumes a large amount of system resources. See Appendix D for more information. When the network connection is unexpectedly broken, how these processes react differs greatly. This is a discussion of what actually occurs when a network connection is broken, and how it affects the Data Guard environment and configuration. This discussion applies to both physical and logical standby databases. As a result of the network connection request, the listener on the standby site creates a separate process on the standby database - called the Remote File Server (RFS) process. This RFS process uses network messages from the primary database; it reads from the network and sends an acknowledgement message back to the primary when it is done processing the request. This results in what is known as a dead connection. A dead connection indicates that there is no physical connection, but the connection appears to still be there to the processes on each system. In this way, the LGWR is able to establish that network connectivity has been lost, and take corrective action.The RFS process that is doing the network read operation is blocked until some data arrives to its reading buffer, or until the underlying network software determines the dead connection is no longer valid. If the probe finds a dead connection or a connection that is no longer in use, it returns an error that causes the RFS process to exit. Connections that do not respond to this probe signal are disconnected.
This parameter should be set up for the standby database, as well as the primary, to prepare it for future switchover scenarios. However, compared to the network traffic generated by Data Guard that is based on the primary database workload, this additional packet traffic is insignificant. This can affect network performance. However, until such time as the RFS process terminates itself, it will retain lock information on the archivelog on the standby site, or the standby redo log, whose redo information was being received from the primary database. During this interval, no new RFS processes can receive redo information from the primary database for the same archived redo log (or the standby redo log). These new RFS processes will resume the reception of redo data from the primary database. This chapter contains the following topics: When used on a physical standby database: You then have the option of either starting Redo Apply or real-time apply, or opening the database for read-only access. When you first start Redo Apply on a newly created physical standby database that has not yet received any redo data from the primary database, an ORA-01112 message may be returned. This indicates that Redo Apply is unable to determine the starting sequence number for media recovery. If this occurs, you must either manually retrieve and register an archived redo log file on the standby database, or wait for the automatic archiving to occur before restarting Redo Apply. Control is not returned to the session that initiates a database shutdown until shutdown is complete. If the MRP0 or MRP process exists, then the standby database is applying redo. Thus, you can reduce the load on the primary database by using the standby database for reporting purposes. You can periodically open the standby database for read-only access and perform ad hoc queries to verify Redo Apply is updating the standby database correctly.
(Note that for distributed queries, you must first issue the ALTER DATABASE SET TRANSACTION READ ONLY statement before you can issue a query on the read-only database.) At some point, you need to resume Redo Apply on the standby database, and apply the archived redo log files to resynchronize the standby database with the primary database. Because of the additional time required to apply any accumulated archived redo log files, having a standby database open for read-only access can increase the time required to complete failovers or switchovers. By default, the ALTER DATABASE OPEN statement opens physical standby databases in read-only mode. The Oracle database determines if this is a physical standby database based on information in the control file. This section describes these events and the recommended responses to these events. In other cases, you might need to perform maintenance tasks on the standby database. It also briefly describes how to respond to these events. Detailed descriptions of the responses are described in the section references provided. Do not use the following procedure with databases that use Oracle Managed Files.This manual intervention involves ensuring the raw devices exist before log apply services on the standby database recover the redo data that will create the new datafile.On the primary database, create a new tablespace where the datafiles reside in a raw device. At the same time, create the same raw device on the standby database. For example. Tablespace created.The standby alert log shows the following: Successfully added datafile 6 to media recovery. Media Recovery Waiting for thread 1 sequence 8 (in transit)For example, issue the following statements on the primary database. Tablespace created. System altered.Originally created as. Recovery was unable to create the file as. MRP0: Background Media Recovery terminated with error 1274. Fri Apr 8 10:00:22 2005. ORA-27041: unable to open file. Linux Error: 13: Permission denied.
Additional information: 1. Some recovered datafiles maybe left media fuzzy. Media recovery may continue but open resetlogs may fail. Fri Apr 8 10:00:22 2005. ORA-27041: unable to open file. Linux Error: 13: Permission denied. Additional information: 1. Fri Apr 8 10:00:22 2005. MTS; MRP0: Background Media Recovery process shutdown. ARCH: Connecting to console port.Fri Apr 8 10:09:30 2005. Completed: alter database create datafileIf the following query returns the MRP or MRP0 process, Redo Apply is running. For example: For example: For example, to drop the tablespace at the primary site: Redo data will be generated and applied at the standby site to plug the tablespace into the standby database. Consequently, you will see error messages similar to the following in the alert log: You can add or drop online redo log file groups or members to the primary database without affecting the standby database. Similarly, you can drop log file groups or members from the primary database without affecting your standby database. However, these changes do affect the performance of the standby database after switchover. Whenever you add an online redo log file to the primary database, you should add corresponding online and standby redo log files to the standby database. You can specify the SQL ALTER DATABASE or SQL ALTER TABLESPACE statement with the FORCELOGGING clause to override the NOLOGGING setting. However, this statement will not repair an already invalidated database. When an ALTER DATABASE OPEN RESETLOGS statement is issued on the primary database, the i ncarnation of the database changes, creating a new branch of redo data. For physical standby databases, no manual intervention is required if the standby database did not apply redo data past the new resetlogs SCN (past the start of the new branch of redo data). The following table describes how to resynchronize the standby database with the primary database branch.