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How to handle Oracle 12C Online Redo Logs
- https://oracle-patches.com/en/databases/oracle/managing-oracle-database-12c-online-redo-logs
- Online redo logs store a record of transactions that have occurred in your Oracle Database 12C. These logs serve the following purposes: Provide a mechanism for recording changes to the database so that in the event of a media failure, you have a method of recovering transactions.
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Managing the Redo Log - Oracle
- https://docs.oracle.com/database/121/ADMIN/onlineredo.htm
- The most crucial structure for recovery operations is the redo log, which consists of two or more preallocated files that store all changes made to the database as they occur. Every instance of an Oracle Database has an associated redo log to protect the database in case of an instance failure. 11.1.1 Redo Threads
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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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Find Redo Log Size / Switch Frequency / Location in Oracle ...
- https://orahow.com/find-redo-log-size-switch-frequency-location/
- Redo logs are the most crucial part of the Oracle database. As a part of tuning, you must check the redo log size and switch frequency. For proper functioning of the Oracle database you must avoid frequent log switches. Oracle redo logs consists of two or more pre-allocated files which record all changes made to the database.
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How to Resize Redo Logs in Oracle - Ed Chen Logic
- https://logic.edchen.org/how-to-resize-redo-logs-in-oracle/
- Check Current Redo Logs Add 3 Groups with New Size (1GB) Switch Logfile to New Groups Force a CheckPoint Drop Group 1, 2, 3 Remove Redo Log Files Add Group 1, 2, 3 with New Size (1GB) Switch Logfile Several Times Check Status of All Redo Logs But don't expect too much, there's no syntax to support resizing directly, we just workaround it. 1.
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How to Move Redo Log Location in Oracle - Ed Chen Logic
- https://logic.edchen.org/how-to-move-redo-log-location-in-oracle/
- Our goal is to make all redo logs go to +DATA/TESTCDB. Furthermore, there're 6 redo log groups in the RAC database, 3 groups per thread. Which is, group 1, 3, 5 are for node 1, group 2, 4, 6 are for node 2. Add a member for each group to the new location. SQL> alter database add logfile member '+DATA/TESTCDB/redo01.log' to group 1;
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How To Add/Increase The Size Of Redo Log Files In ... - Oracle
- https://support.oracle.com/knowledge/Oracle%20Database%20Products/779306_1.html
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Find redo log members / redo log file size / redo log ...
- https://deveshdba.wordpress.com/2016/08/22/find-redo-log-members-redo-log-file-size-redo-log-status/
- To find redo log file size. SQL> select GROUP#,THREAD#,SEQUENCE#,bytes/1024/1024, MEMBERS,STATUS from v$log; GROUP# THREAD# SEQUENCE# BYTES/1024/1024 MEMBERS STATUS ---------- ---------- ---------- --------------- ---------- ---------------- 1 1 10 100 2 INACTIVE 2 1 11 100 2 INACTIVE 3 1 12 100 2 CURRENT
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PDF Redo Apply Best Practices - Oracle
- https://www.oracle.com/technetwork/database/availability/redo-apply-2745943.pdf
- to a large degree, the issue that most often impacts redo apply performance is frequent log switches. online redo logs and standby redo logs should use redo log size = 4gb or redo log size >= peak redo rate/minute x 20 minutes. to determine peak redo rates, please refer to awr reports during peak workload periods such as batch processing, quarter …
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How to resize online redo log files ... - Oracle Database Blog
- https://saisrinivase.wordpress.com/2014/10/09/how-to-resize-online-redo-log-files-in-rac-database-with-asm-option/
- To Drop the old redo log files need to switch the log file on all the instance until all current online redologs are located on the newly added groups. SQL> alter system switch logfile; System altered.
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Managing Archived Redo Log Files - Oracle
- https://docs.oracle.com/database/121/ADMIN/archredo.htm
- The archiving of filled redo log files can require you to perform extra administrative operations. 12.2.1 Running a Database in NOARCHIVELOG Mode When you run your database in NOARCHIVELOG mode, you disable the archiving of the redo log. The database control file indicates that filled groups are not required to be archived.
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How to add and drop online redo log members and groups in ...
- https://www.thegeekdiary.com/how-to-add-and-drop-online-redo-log-members-and-groups-in-oracle/
- The redo log files record all changes made to data in the database buffer cache with some exceptions; for example, in the case of direct writes. Redo log files are used in a situation such as an instance failure to recover committed data that has not been written to the data files. The redo log files are only used for recovery.
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Recommended Redo Log size — oracle-tech
- https://community.oracle.com/tech/developers/discussion/3927777/recommended-redo-log-size
- A good rule of thumb is to switch a redo log every 20 to 30 minutes. Listing 1 gives a SQL statement that will show how often log file switching is occurring every hour. You need only increase your redo log sizes to hold more redo and this will reduce the amount of log file switching." John Stegeman Member Posts: 24,269 Blue Diamond
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ADD-DROP Redo log files in Oracle Database - DBsGuru
- https://dbsguru.com/add-drop-redo-log-files-in-oracle-database/
- In the real world, we may encounter scenarios where we need to or asked to increase/decrease the size of redo log files as log switches creating contentions at the database. For example, by increasing the redo log file size, the number of log switches can be decreased which in turn will improve the database performance.
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How to Determine If the Oracle Redo Log File Size Is a Problem
- https://logicalread.com/oracle-11g-redo-log-file-size-is-problem-mc02/
- How to Determine If the Oracle Redo Log File Size Is a Problem. By Richard Niemiec on April 19, 2013 . Two potential problems are possible that should be addressed when considering whether to increase the size of Oracle log files: batch jobs that don't have enough total redo space to complete and long-running jobs that are spending a large ...
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What is Standby redologs in oracle dataguard - DBACLASS
- https://dbaclass.com/article/standby-redologs-oracle-dataguard/
- Standby redolog is mandatory for realtime apply In 12c DEFAULT MRP will go to REAL TIME APPLY mode. Oracle recommends to keep standby redologs on both primary and standby database. (Though SLR is not mandatory for primary, it will make the switchover quick without any additional DBA activity. Steps to add standby redolog: 1.
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Managing the Redo Log - Oracle DBA [Updated] 2022
- https://mindmajix.com/oracle-dba/managing-redo-log
- The most crucial structure for recovery operations is the Managing the Redo Log - Oracle DBA, which consists of two or more preallocated files that store all changes made to the database as they occur.Every instance of an Oracle Database has an associated redo log to protect the database in case of an instance failure.
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How To Resize the Online Redo Logfiles | ORACLE RAC DBA
- https://oracleracdba1.wordpress.com/2013/01/28/how-to-resize-the-online-redo-logfiles/
- How to resize redo logfile group in Oracle RAC. 1. First see the size of the current logs: SQL> select group#, bytes, status from v$log; GROUP# BYTES STATUS ———- ———- —————- 21 1073741824 INACTIVE 22 1073741824 CURRENT 23 1073741824 INACTIVE 24 1073741824 INACTIVE 25 1073741824 INACTIVE 26 1073741824 INACTIVE 27 1073741824 INACTIVE
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oracle 12c dataguard async with standby redolog and real ...
- https://community.oracle.com/tech/apps-infra/discussion/4031531/oracle-12c-dataguard-async-with-standby-redolog-and-real-time-apply-data-loss
- To start apply services on a physical standby database, ensure the physical standby database is started and mounted and then start Redo Apply as follows: SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE; This also automatically enables real-time apply provided the standby database is configured with a standby redo log and is in ARCHIVELOG mode.
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How to use Archivelog Mode in Oracle 12C
- https://oracle-patches.com/en/databases/oracle/oracle-database-12c-implementing-archivelog-mode
- The trail of archive redo log files is crucial to your ability to recover the Oracle database 12C with all changes intact, right up to the precise point of failure. Making Architectural Decisions When you implement archivelog mode, you also need a strategy for managing the archived log files. The archive redo logs consume disk space.
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Size Redo Logs - Ask TOM - Oracle
- https://asktom.oracle.com/pls/apex/asktom.search?tag=size-redo-logs
- Size Redo Logs We have archived log mode on for 11.2 database 1)How to decide the optimal size for redo log files ?2)How to resize the redo log files to 512 MB from its current size of 1GB. Is it possible ? Will this automatically reduce the newly generated archived logs too.3) I created Redo log f
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How to relocate the redo log files to a different location ...
- https://www.thegeekdiary.com/how-to-relocate-the-redo-log-files-to-a-different-location-on-disk/
- 1. Shut down the database. 2. Copy the online redo log files to the new location. Operating system files, such as online redo log members, must be copied using the appropriate operating system commands. The following example uses operating system commands (UNIX) to move the online redo log members to a new location:
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Manage Redo log file size in RAC Environment | Smart way ...
- https://smarttechways.com/2019/07/26/manage-redo-log-file-size-in-rac-environment/
- Manage Redo log file in RAC Environment. Check the redo log file with thread. Thread represent the instance no present in the RAC database.Suppose 3 Node RAC has 3 threads number. Resize the redo log file in RAC Environment as follows: 1. Check the size of redo log and how many redo log file present in each instance.
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Redo log files - Oracle Database Video Tutorial | LinkedIn ...
- https://www.linkedin.com/learning/oracle-12c-database-administration/redo-log-files
- Join David Yahalom for an in-depth discussion in this video, Redo log files, part of Oracle 12c Database: Administration.
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TDE encryption in Oracle 12c step by step - Techgoeasy
- https://techgoeasy.com/tde-encryption-in-oracle-12c-step-by-step/
- TDE is fully integrated with Oracle database. Encrypted data remains encrypted in the database, whether it is in tablespace storage files, temporary tablespaces, undo tablespaces, or other files that Oracle Database relies on such as redo logs. Also, TDE can encrypt entire database backups (RMAN) and Data Pump exports. How is TDE licensed?
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Beginning with Oracle Database 12c, real-time apply is ...
- https://seydikorurer.wordpress.com/2020/07/01/beginning-with-oracle-database-12c-real-time-apply-is-enabled-by-default-during-redo-apply/
- with oracle 12c you can see this warning on alert log. Warning: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE has been deprecated. yes there is some changes for Oracle redo apply. "using current logfile" has depreceted, and when you use "ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT" is starts real time apply insted…
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