offline redo log files in oracle

offline redo log files in oracle

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Find Redo Log Size / Switch Frequency / Location in Oracle ...

    https://orahow.com/find-redo-log-size-switch-frequency-location/
    06/10/2020 · Types of Redo Log Files. Current: The redo log file that log writer (LGWR) is actively writing is called the current redo log file. Active: Redo log file that are required for instance recovery are called active redo log files. Inactive: Redo log files that are no longer required for instance recovery are called inactive redo log files. Check Redo Log Size in Oracle
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    https://orahow.com/find-redo-log-size-switch-frequency-location/

reg : offline redo log files | SAP Community

    https://answers.sap.com/questions/5706456/reg--offline-redo-log-files.html
    Mar 24, 2009 — Offline redo log files are used in system recovery. Especially, when you want to perform point-in-time recovery. When we set Archive logging ...3 answers · Top answer: Hi An offline copy of an online redo logs is called an archived redo log. You must run the ...Offline redo log files are created with unexpectd permisions ...Jun 24, 2008what is the importance of the offline redo log files - SAP AnswersMay 7, 2019Applying offline redo logs... | SAP CommunityMay 5, 2019BR0017E Offline redo log file 'E:\oracle\product\10.2.0\db_1 ...May 24, 2008More results from answers.sap.com
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    https://answers.sap.com/questions/5706456/reg--offline-redo-log-files.html

Managing Archived Redo Log Files - Oracle Help Center

    https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-archived-redo-log-files.html
    Oracle Database lets you save filled groups of redo log files to one or more offline destinations, known collectively as the archived redo log . The process of turning redo log files into archived redo log files is called archiving. This process is only possible if the database is running in ARCHIVELOG mode.
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Managing the Redo Log - Oracle DBA [Updated] 2022

    https://mindmajix.com/oracle-dba/managing-redo-log
    You can create groups and members of online redo log files during or after database creation. To create new online redo log groups and members, you must have ...V$log: Displays the redo log file information fr...V$logfile: Identifies redo log groups and memb...V$log_history: Contains log history informationView: Description Rating: 5 · ‎56,687 reviews
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    https://mindmajix.com/oracle-dba/managing-redo-log

MySQL :: MySQL 8.0 Reference Manual :: 15.6.5 Redo Log

    https://dev.mysql.com/doc/refman/8.0/en/innodb-redo-log.html
    The redo log archiving feature, introduced in MySQL 8.0.17, addresses this issue by sequentially writing redo log records to an archive file in addition to the redo log files. Backup utilities can copy redo log records from the archive file as necessary, thereby avoiding the potential loss of …
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    https://dev.mysql.com/doc/refman/8.0/en/innodb-redo-log.html

How to Manage Oracle Redo Logfiles

    https://oracle-dba-online.com/managing_redo_logfiles.htm
    Adding a New Redo Logfile Group To add a new Redo Logfile group to the database give the following command SQL>alter database add logfile group 3 '/u01/oracle/ica/log3.ora' size 10M; Note: You can add groups to a database up to the MAXLOGFILES setting you have specified at the time of creating the database.
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    https://oracle-dba-online.com/managing_redo_logfiles.htm

Introduction to the Oracle Database

    https://docs.oracle.com/cd/B19306_01/server.102/b14220/intro.htm
    Redo Log Files. Every Oracle database has a set of two or more redo log files. The set of redo log files is collectively known as the redo log for the database. A redo log is made up of redo entries (also called redo records). The primary function of the redo log is to record all changes made to data. If a failure prevents modified data from being permanently written to the …
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    https://docs.oracle.com/cd/B19306_01/server.102/b14220/intro.htm

BR0017E Offline redo log file 'E:\oracle\product\10.2.0\db ...

    https://answers.sap.com/questions/4124327/br0017e-offline-redo-log-file-%27eoracleproduct1020d.html
    Oldest online log sequence 648. Next log sequence to archive 651. Current log sequence 651 SCN: 4541526. Database block size 8192 Thread: 1. Current system change number 4541528 ResetId: 655392325. BR0018I Waiting for the next offline redo log file... BR0017E Offline redo log file 'E:\oracle\product\10.2.0\db_1\RDBMS\ARC00650_0655392325.001 ...
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    https://answers.sap.com/questions/4124327/br0017e-offline-redo-log-file-%27eoracleproduct1020d.html

Oracle Database Instance - Oracle Help Center

    https://docs.oracle.com/en/database/oracle/oracle-database/19/cncpt/oracle-database-instance.html
    Buffering redo data before writing it to the online redo log files. Storing SQL execution plans. Oracle processes running on a single computer share the SGA. The way in which Oracle processes associate with the SGA varies according to operating system. A database instance includes background processes. Server processes, and the process memory allocated in these …
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Clearing a Redo Log File - Oracle

    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo008.htm
    A redo log file might become corrupted while the database is open, and ultimately stop database activity because archiving cannot continue. In this situation the ALTER DATABASE CLEAR LOGFILE statement can be used to reinitialize the file without shutting down the database. The following statement clears the log files in redo log group number 3:
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    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo008.htm

redo log files — oracle-tech

    https://community.oracle.com/tech/developers/discussion/1073814/redo-log-files
    There is no such method to mark an Online Redo Log file. Say your Online Redo Log is 500MB in size. At time t1, your OS level "cp" command starts reading the file. At time t4, LGWR starts writing to it. Between t1 and t4, the "cp" command has copied out blocks from the file as of the last SEQ# that had ben assigned to it.
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Managing the Redo Log - Oracle

    https://docs.oracle.com/cd/B19306_01/server.102/b14231/onlineredo.htm
    Active (Current) and Inactive Redo Log Files Oracle Database uses only one redo log files at a time to store redo records written from the redo log buffer. The redo log file that LGWR is actively writing to is called the current redo log file. Redo log files that are required for instance recovery are called active redo log files.
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    https://docs.oracle.com/cd/B19306_01/server.102/b14231/onlineredo.htm

BR0017E Offline redo log file not found | SAP Community

    https://answers.sap.com/questions/4657300/br0017e-offline-redo-log-file-not-found.html
    BR0321I Switch to next online redo log file for database instance PRD successful BR0117I ARCHIVE LOG LIST after backup for database instance PRD Parameter Value Database log mode Archive Mode Automatic archival Enabled Archive destination E:\oracle\PRD\saparch\PRDarch Archive format ARC%S_%R.%T Oldest online log sequence 103241
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    https://answers.sap.com/questions/4657300/br0017e-offline-redo-log-file-not-found.html

How to Move Redo Log Location in Oracle - Ed Chen Logic

    https://logic.edchen.org/how-to-move-redo-log-location-in-oracle/
    There're two approaches that can change the location of redo log files of a single-instance database. Moving Redo Log Files Offline of a Single-instance Database Replacing Redo Log Files Online of a Single-instance Database 1. Moving Redo Logs of a Single-instance Database It's actually a moving process of redo log files. Check current redo logs.
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    https://logic.edchen.org/how-to-move-redo-log-location-in-oracle/

Managing Archived Redo Log Files - Oracle

    https://docs.oracle.com/database/121/ADMIN/archredo.htm
    Oracle Database lets you save filled groups of redo log files to one or more offline destinations, known collectively as the archived redo log. The process of turning redo log files into archived redo log files is called archiving. This process is only possible if the database is running in ARCHIVELOG mode.
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    https://docs.oracle.com/database/121/ADMIN/archredo.htm

About Online Redo Log Files - Oracle

    https://docs.oracle.com/database/121/ADMQS/GUID-AC77A1A5-6633-4F21-BD82-CC75C660EC40.htm
    The online redo log files are used to recover a database after hardware, software, or media failure. To protect against a failure involving the online redo log file itself, Oracle Database can multiplex the online redo log file so that two or more identical copies of the online redo log file can be maintained on different disks.
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    https://docs.oracle.com/database/121/ADMQS/GUID-AC77A1A5-6633-4F21-BD82-CC75C660EC40.htm

6 Managing the Redo Log - Oracle

    https://docs.oracle.com/cd/B14117_01/server.101/b10739/onlineredo.htm
    Active (Current) and Inactive Redo Log Files Oracle Database uses only one redo log files at a time to store redo records written from the redo log buffer. The redo log file that LGWR is actively writing to is called the currentredo log file. Redo log files that are required for instance recovery are called activeredo log files.
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    https://docs.oracle.com/cd/B14117_01/server.101/b10739/onlineredo.htm

ADD /Drop redo log files in Oracle database - Techgoeasy

    https://techgoeasy.com/drop-recreate-redo-logs-oracle-database/
    We often get situation where we need to increase the size of the redo log files as log switches are very frequent.Increasing the redo log files sizes decreases the log switches and improves the performance of the database.There is no resize command for redo log files, we have to recreate redo log i,e dropped and added in order to increase or decrease the size.
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    https://techgoeasy.com/drop-recreate-redo-logs-oracle-database/

How to handle Oracle 12C Online Redo Logs

    https://oracle-patches.com/en/databases/oracle/managing-oracle-database-12c-online-redo-logs
    The log writer is the background process responsible for writing transaction information from the redo log buffer (in the SGA) to the online redo log files (on disk). Log writer flushes the contents of the redo log buffer when any of the following are true: A COMMIT or ROLLBACK issued.; A log switch occurs.
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    https://oracle-patches.com/en/databases/oracle/managing-oracle-database-12c-online-redo-logs

Standby Database: BRARCHIVE Backup of Offline Redo Log Files

    https://help.sap.com/doc/saphelp_nw75/7.5.5/en-US/46/ad9ab7c5b462d1e10000000a1553f7/content.htm
    You import the offline redo log files with the following Oracle command: RECOVER STANDBY DATABASE; When the volume of offline redo log files is high, the import to the standby database occurs parallel to the backup, leading to significantly faster processing. For more information, see -m|- modify. Caution
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    https://help.sap.com/doc/saphelp_nw75/7.5.5/en-US/46/ad9ab7c5b462d1e10000000a1553f7/content.htm

Restore and Application of Offline Redo Log Files with BR ...

    https://help.sap.com/doc/saphelp_nw73/7.3.16/en-US/47/0d5a1f99d566c9e10000000a1553f6/content.htm
    You can use BR*Tools for Oracle to restore and apply offline redo log files - that is, archivelog files. BRRESTORE restores offline redo log files and BRRECOVER applies the offline redo log files. Caution Only perform this procedure if you are an expert in Oracle database administration.
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    https://help.sap.com/doc/saphelp_nw73/7.3.16/en-US/47/0d5a1f99d566c9e10000000a1553f6/content.htm

Restore and Application of Offline Redo Log Files with BR ...

    https://help.sap.com/saphelp_crm60/helpdata/fr/8c/09503e30a9d549e10000000a114084/frameset.htm
    Restore and Application of Offline Redo Log Files with BR*Tools Purpose. You can use BR*Tools for Oracle to restore and apply offline redo log files - that is, archivelog files. BRRESTORE restores offline redo log files and BRRECOVER applies the offline redo log files. Only perform this procedure if you are an expert in Oracle database ...
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    https://help.sap.com/saphelp_crm60/helpdata/fr/8c/09503e30a9d549e10000000a114084/frameset.htm

Displaying Logs for Redo Log Backups (Oracle)

    https://help.sap.com/doc/saphelp_nw73/7.3.16/en-US/f2/f77b0e5cfa4b29a3919cbf2e660fb6/content.htm
    To see more information about a redo log backup, double-click the appropriate line to display the BRARCHIVE action log: To look at the system log for a redo log file in the backup, place the cursor on the relevant line and choose Detail log. For more information, see BRARCHIVE Detail Log.
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    https://help.sap.com/doc/saphelp_nw73/7.3.16/en-US/f2/f77b0e5cfa4b29a3919cbf2e660fb6/content.htm

Managing the Online Redo Log - Oracle

    https://docs.oracle.com/cd/B10501_01/server.920/a96521/onlineredo.htm
    Oracle assigns each online redo log file a new log sequence number every time that a log switch occurs and LGWR begins writing to it. If Oracle archives online redo log files, the archived log retains its log sequence number. The online redo log file that is cycled back for use is given the next available log sequence number.
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    https://docs.oracle.com/cd/B10501_01/server.920/a96521/onlineredo.htm

Backing Up the Offline Redo Log Files with BR*Tools

    https://help.sap.com/doc/saphelp_nw73ehp1/7.31.19/en-US/47/14cbe48bcc1dcbe10000000a155369/frameset.htm
    Check the results in the BRARCHIVE logs. The summary log arch.log displays the backed up archive log files and the return code. The detail log a. displays progress. For more information on how to view the logs, see Showing Profiles and Logs with BR*Tools.
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    https://help.sap.com/doc/saphelp_nw73ehp1/7.31.19/en-US/47/14cbe48bcc1dcbe10000000a155369/frameset.htm

Restoring and Applying Offline Redo Log Files

    https://help.sap.com/viewer/3ef1b95cacbf4f77a066797285371bb9/118/en-US/471c582741f64406e10000000a1553f6.html
    BRRESTORE restores the offline redo log files in ascending order of application. This means that the first logs to be restored are those that are needed to start the apply phase. This procedure restores and applies offline redo log files as follows: Up to 100 files are processed as a single group. All the files in a group must be from the same ...
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    https://help.sap.com/viewer/3ef1b95cacbf4f77a066797285371bb9/118/en-US/471c582741f64406e10000000a1553f6.html

Question about how Oracle manages Redo Log Files

    https://community.oracle.com/tech/developers/discussion/1114615/question-about-how-oracle-manages-redo-log-files
    When an online redo log group is dropped from the database, and you are not using the Oracle Managed Files feature, the operating system files are not deleted from disk. Rather, the control files of the associated database are updated to drop the members of the group from the database structure.
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Backup and Database Copy with BR*Tools

    https://help.sap.com/doc/saphelp_nw73ehp1/7.31.19/en-US/47/1370b6199c1dd0e10000000a155369/content.htm
    If you have configured your system according to the SAP recommendations, the Oracle database system saves the online redo log files automatically as offline redo log files. Unless you have changed the standard profile init.ora, the offline redo log files are stored in the archive directory /oraarch.
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    https://help.sap.com/doc/saphelp_nw73ehp1/7.31.19/en-US/47/1370b6199c1dd0e10000000a155369/content.htm

Archive log file size — oracle-tech

    https://community.oracle.com/tech/developers/discussion/1062381/archive-log-file-size
    This is very conspicuous for very small redo log files (smaller than 10 MB); as such, the 2.5 MB archive logs generated from 5 MB redo logs are very visible. Just note that at this moment, the default redo log files are 100 MB in size. If the resulting archive log files would be between 98 and 100 MB nobody would notice.
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BR0543E Offline redolog backup using RMAN failed — oracle-tech

    https://community.oracle.com/tech/apps-infra/discussion/4212008/br0543e-offline-redolog-backup-using-rman-failed
    Well, offline redo log does not mean anything in Oracle/RMAN terms. Maybe it does using SAP or your backup software, but I have no idea since I don't know jack about SAP. RMAN does not backup online or offline redo logs - the only redo logs it can backup are archived redo logs or archivelogs.
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Oracle-1z0-060new - weidianyuedu.com

    https://www.weidianyuedu.com/content/2817819239023.html
    * RMAn uses a recovery catalog to track filenames for all database files in a Data Guardenvironment. A recovery catalog is a database schema used by RMAn to store metadataabout one or more oracle databases. The catalog also records where the online redo logs,standby redo logs, tempfiles, archived redo logs, backup sets, and image copies arecreated.
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