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Using LogMiner to Analyze Redo Log Files - Oracle
- https://docs.oracle.com/cd/B19306_01/server.102/b14215/logminer.htm
- 17 Using LogMiner to Analyze Redo Log Files. Oracle LogMiner, which is part of Oracle Database, enables you to query online and archived redo log files through a SQL interface. Redo log files contain information about the history of activity on a database.
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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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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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About Online Redo Log Files - Oracle
- https://docs.oracle.com/en/database/oracle/oracle-database/12.2/rilin/about-online-redo-log-files.html
- The online redo log files for a database instance are called the redo thread. Each Oracle RAC database instance has its own redo thread to avoid contention for a single set of online redo log files. In case of instance failure, the online redo log files must be accessible by the surviving instances.
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Introduction to the Oracle Database
- https://docs.oracle.com/cd/B19306_01/server.102/b14220/intro.htm
- The online redo log is a set of two or more online redo log files that record all changes made to the database, including uncommitted and committed changes. Redo entries are temporarily stored in redo log buffers of the system global area, and the background process LGWR writes the redo entries sequentially to an online redo log file.
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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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Managing Archived Redo Logs - Oracle
- https://docs.oracle.com/cd/B19306_01/server.102/b14231/archredo.htm
- What Is the Archived Redo Log? Oracle Database lets you save filled groups of redo log files to one or more offline destinations, known collectively as the archived redo log, or more simply the archive 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
- 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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Oracle SQL Tutorial: Learn Oracle SQL from scratch with ...
- https://www.oracle-dba-online.com/sql/oracle_sql_tutorial.htm
- Every Oracle database has a set of two or more redo log files. The set of redo log files for a database is collectively known as the database's redo log. 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 ...
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What Is the Redo Log? - Oracle
- https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo001.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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Recover Database until cancel tips - dba-oracle.com
- http://www.dba-oracle.com/bk_recover_database_until_cancel_tips.htm
- Oracle applies the necessary redo log files to reconstruct the restored datafiles. Oracle supplies the name it expects to find from LOG_ARCHIVE_DEST_1 and requests you to stop or proceed with applying the log file. Note that if the control file is a backup, then you must supply the names of the online logs if you want to apply the changes in these logs.
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Online Redo Log Files Size - Oracle
- https://docs.oracle.com/cd/E57185_01/OHFMA/online_redo_log_files_size.htm
- But the preferred way to determine the size of redo log files is to enable FAST_START_MTTR_TARGET, and run a typical database workload for a while. Then run the following query to obtain the optimal size of redo logs. SQL> select optimal_logfile_size from v$instance_recovery;
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How to handle Oracle 12C Online Redo Logs
- https://oracle-patches.com/en/databases/oracle/managing-oracle-database-12c-online-redo-logs
- This parameter is commonly used in Oracle Data Guard environments to force log switches after the specified amount of time elapses. You can also query the OPTIMAL_LOGFILE_SIZE column from the V$INSTANCE_RECOVERY view to determine if your online redo log files have been sized correctly: SQL> select optimal_logfile_size from v$instance_recovery;
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How to Manage Oracle Redo Logfiles - oracle-dba-online.com
- https://oracle-dba-online.com/managing_redo_logfiles.htm
- A redo log file might become corrupted while the database is open, and ultimately stop database activity because archiving cannot continue. In this situation the ALTER DATABASE CLEAR LOGFILE statement can be used reinitialize the file without shutting down the database.
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Managing Online Redo Log Files - IT Tutorial - Oracle DBA
- https://ittutorial.org/managing-online-redo-log-files/
- Online redo log files are files that hold transaction records in the database. Log files to recover the database in case of a problem. For example, if we shut down the database abruptly (shutdown abort), SMON performs instance recovery by reading these log files during database startup.
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Find Redo Log Size / Switch Frequency / Location in Oracle
- https://orahow.com/find-redo-log-size-switch-frequency-location/
- Redo logs are the most crucial part of the Oracle database. As a part of tuning, you must check the redo log size and switch frequency. For proper functioning of the Oracle database you must avoid frequent log switches. Oracle redo logs consists of two or more pre-allocated files which record all changes made to the database.
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Oracle-19c Recover a loss of all online redo log files using RMAN | Oracledbwr
- https://oracledbwr.com/oracle-19c-recover-a-loss-of-all-online-redo-log-files-using-rman/
- The recovery process creates the online redo logfiles at the operating system level. Since we have done an incomplete recovery with open resetlogs, we should take a fresh complete backup of the database. SQL> select name,open_mode from v$database; NAME OPEN_MODE ——— ——————- ORCL READ WRITE Catch Me On:- Hariprasath Rajaram
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Managing the Redo Log - Oracle DBA [Updated] 2022 - Mindmajix
- https://mindmajix.com/oracle-dba/managing-redo-log
- Every Oracle database has a set of two or more online 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, which are also called redo records. The redo log stores a copy of the changes made to the data.
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Online redo log files being removed physically — oracle-tech
- https://community.oracle.com/tech/developers/discussion/2614250/online-redo-log-files-being-removed-physically
- After dropping a redo log file, ensure that the drop completed successfully, and then use the appropriate operating system command to delete the dropped redo log file ." http://docs.oracle.com/cd/E11882_01/server.112/e25494/onlineredo.htm#ADMIN11324 BTW . You don't even need to set db_create_online_log_dest_n to enable OMF for ORLs.
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ADD-DROP Redo log files in Oracle Database - DBsGuru
- https://dbsguru.com/add-drop-redo-log-files-in-oracle-database/
- 1.Check the location of redo log groups and members. Click here for sample output. set lines 333 col GROUP# for 9999 col TYPE for a30 col MEMBER for a45 select GROUP#,TYPE,MEMBER from v$logfile; prompt$$$$$$$**Welcome to DBsGuru!**Share Learn Grow**$$$$$$$ 2. Check the status of redo log files.Click here for sample output.
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Find redo log members / redo log file size / redo log status - deveshdba
- https://deveshdba.wordpress.com/2016/08/22/find-redo-log-members-redo-log-file-size-redo-log-status/
- ora-03206: maximum file size of (4194304) blocks in autoextend clause is out of range Posted on August 22, 2016 August 25, 2016 Uncategorized Find redo log members / redo log file size / redo log status
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Managing the Redo Log - Oracle Help Center
- https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-the-redo-log.html
- 11.1.3.1 Active (Current) and Inactive Redo Log Files Oracle Database uses only one redo log file 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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improving redo log I/O performance — oracle-tech
- https://community.oracle.com/tech/developers/discussion/2593956/improving-redo-log-i-o-performance
- I think you can quickly find out whether it is redo log writing problem by comparing its LUN write speed against Redo fill rate. If you say that redo switch after 45 minutes with the size of redo 1GB. Redo Fill rate = 1024^1024 KB / (45^60 sec) = 388 KB/sec That is very low write load.
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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/
- 6. Remove Redo Log Files. Now, you have to remove these physical log files by yourself, otherwise you will receive ORA-27038: created file already exists. Be careful, don't remove online redo logs accidentally. A better practice to remove such sensitive files is to use interactive mode of rm.
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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/
- As you can see, we change the location of log files by replacing old log files with new ones. B. RAC Database. Since direct copying redo log files in ASM disk groups has some side effects for a RAC database, so we focus only on replacing old redo logs with new ones. Replacing Redo Log Files of a RAC Database; 1.
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Introducing Oracle Automatic Storage Management
- https://docs.oracle.com/pls/topic/lookup?ctx=en/database/oracle/oracle-database/21/haovw&id=OSTMG-GUID-BC612D35-5399-4A35-843E-CF76E3D3CDB5
- Data files, temporary data files, and data file copies. SPFILEs. Online redo logs, archive logs, and Flashback logs. RMAN backups. Disaster recovery configurations. Change tracking bitmaps. Data Pump dumpsets. Oracle ASM automatically generates Oracle ASM file names as part of file creation and tablespace creation.
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Log_file_name_convert — oracle-tech
- https://community.oracle.com/tech/apps-infra/discussion/2511535/log-file-name-convert
- If standby redo logs are bigger than primary online redo, then standby site will generate different archivelogs, with different size, sequence, first and last scn. Nope, if log switch occurred then immediately it will be forced on standby database also, You can compare the size of primary and standby archive log files.
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Online Redo Logs on Physical Standby - Oracle
- https://support.oracle.com/knowledge/Oracle%20Database%20Products/740675_1.html
- Oracle Database Exadata Express Cloud Service - Version N/A and later Oracle Cloud Infrastructure - Database Service - Version N/A and later Information in this document applies to any platform. Goal. Usage of Online Redo Logs on Physical Standby. Impact Drop and Add on redo log on Primary has on Standby.
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Work with Oracle database redo log files | Datastream | Google Cloud
- https://cloud.google.com/datastream/docs/work-with-oracle-database-redo-log-files
- If Oracle's redo log files are switched frequently or kept to a smaller size (for example, < 256MB), Datastream can replicate changes faster. There are configuration parameters that you can set to control the log file rotation frequency: Size: Online redo log files have a minimum size of 4 MB, and the default size is dependent on your operating ...
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Resizing online redo log files in Oracle RAC on ASM - The Brew Tech
- https://thebrewtech.com/resizing-online-redo-log-files-in-oracle-rac-on-asm/
- Resizing online redo log files in Oracle RAC on ASM. November 1, 2020. June 6, 2021. Hitesh Chauhan ASM, RAC, REDO LOG, RESIZE. We must drop the redo log files and create new ones with different size. But before dropping the redolog files, we must create "temporary" ones, because we just can't let the DB without redo log files. Check the ...
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Mirroring the Online Redo Log Files - SAP
- https://help.sap.com/doc/saphelp_nw73/7.3.16/en-US/47/1cadec41f64403e10000000a1553f6/content.htm
- If an online redo log file of a group is lost, the database remains in operation. Oracle then uses the remaining member (or members) of this group to log the database changes. In such a case, you must recover the original mirroring of the online redo log files as quickly as possible.
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How to find redo log members/redo log file size/redo log status - The Geek Diary
- https://www.thegeekdiary.com/how-to-find-redo-log-members-redo-log-file-size-redo-log-status/
- Redo Logs consist of two or more pre-allocated files that store all changes made to the database as they occur. Every instance of an Oracle Database has associated online redo logs to protect the database in case of an instance failure. Redo log files are filled with redo records. A redo record also called a redo entry, is made up of a group of change vectors, each of which is a description of ...
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