redo log file management in oracle 11g

redo log file management in oracle 11g

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Managing the Redo Log - Oracle

    https://docs.oracle.com/cd/E11882_01/server.112/e25494/onlineredo.htm
    How Oracle Database Writes to the Redo Log. The redo log of a database consists of two or more redo log files. The database requires a minimum of two files to guarantee that one is always available for writing while the other is being archived (if the database is in ARCHIVELOG mode). See "Managing Archived Redo Logs" for more information.. LGWR writes to redo log files in a circular fashion.
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    https://docs.oracle.com/cd/E11882_01/server.112/e25494/onlineredo.htm

Oracle 11g Resize Redo Log Size on Data Guard and Primary …

    https://doyensys.com/blogs/oracle-11g-resize-redo-log-size-on-data-guard-and-primary-database/
    Oracle 11g Resize Redo Log Size on Data Guard and Primary Database. Home » Oracle 11g Resize Redo Log Size on Data Guard and Primary Database. Current Status Of Redo Logs. ... Auto File Management Disable on Standby Side. SQL> alter system set standby_file_management=manual. System altered.
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    https://doyensys.com/blogs/oracle-11g-resize-redo-log-size-on-data-guard-and-primary-database/

Managing the Redo Log - Oracle

    https://docs.oracle.com/cd/B19306_01/server.102/b14231/onlineredo.htm
    How Oracle Database Writes to the Redo Log. The redo log of a database consists of two or more redo log files. The database requires a minimum of two files to guarantee that one is always available for writing while the other is being archived (if the database is in ARCHIVELOG mode). See "Managing Archived Redo Logs" for more information.. LGWR writes to redo log files in a circular fashion.
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    https://docs.oracle.com/cd/B19306_01/server.102/b14231/onlineredo.htm

logging - Oracle 11g Redo Log size - Stack Overflow

    https://stackoverflow.com/questions/43772544/oracle-11g-redo-log-size
    May 04, 2017 · The redo log buffer is flushed every 3 seconds, when 1/3 full, or when you commit. Oracle will write the buffer to the redo logs and they will switch when full. You will have to set your redo log size high enough so that you don't get switches too often. Getting a switch every few minutes on a busy production system is acceptable.
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    https://stackoverflow.com/questions/43772544/oracle-11g-redo-log-size

Redo log best practice for performace - ASM 11g - Oracle

    https://community.oracle.com/tech/apps-infra/discussion/2613336/redo-log-best-practice-for-performace-asm-11g
    Dec 15, 2013 · I read it somewhere that oracle recommand to have only two disk group one for the all DB fils, control files online redo log files and other disk group for recovery files, like mulitplex redo file, archive log files etc. Will there be any performance improvment to make different diskgroup for online redo log (separate from datafiles, contorl ...
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Oracle : REDOLOG FILE MANAGEMENT – KTEXPERTS

    https://www.ktexperts.com/oracle-redolog-file-management/
    Oct 16, 2017 · Current: Oracle Database uses only one redo log file at a time to store redo information written from the redo log buffer. The redo log file that LGWR is actively writing to is called the current redo log file. Active: Redo log files those are required for instance recovery is called active redo log files.
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    https://www.ktexperts.com/oracle-redolog-file-management/

How to Manage Oracle Redo Logfiles

    https://oracle-dba-online.com/managing_redo_logfiles.htm
    Every Oracle database must have at least 2 redo logfile groups. Oracle writes all statements except, SELECT statement, to the logfiles. This is done because Oracle performs deferred batch writes i.e. it does write changes to disk per statement instead it performs write in batches.
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    https://oracle-dba-online.com/managing_redo_logfiles.htm

Redo Log Files Management (Archived)

    https://anargodjaev.wordpress.com/2013/12/05/redo-log-files-management-archived/
    Redo Log Files Management (Archived) December 5, ... In 07/11/2012 my theme of: "Orneklerle Oracle 11g R2 ve Genel Kavramlar / Oracle 11g R2 General Concepts with Examples " was published as a book. The book was published: 07.11.2012, edition 356 copies, order was 50.
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    https://anargodjaev.wordpress.com/2013/12/05/redo-log-files-management-archived/

Redo Log in Oracle RAC 11G — oracle-tech

    https://community.oracle.com/tech/apps-infra/discussion/3584353/redo-log-in-oracle-rac-11g
    Jul 15, 2014 · The fact that the database is Oracle RAC has no bearing on the size of the online redo logs. The only thing that matters when sizing the online redo logs is the rate of change being written to the ORL's. If your database has lots of change, you will most likely want larger ORLs. Aim for 3-4 log switches per hour.
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Redo Logfile Management - DBA CENTRE

    https://www.dbacentre.com/redo-logfile-management/
    Oracle Database assigns each redo log file a new log sequence number every time a log switch occurs and LGWR begins writing to it. When the database archives redo log files, the archived log retains its log sequence number. A redo log file that is cycled back for use is given the next available log sequence number.
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    https://www.dbacentre.com/redo-logfile-management/

Loss of redo log files | Oracle 10g/11g Data and Database ...

    https://subscription.packtpub.com/book/big-data-and-business-intelligence/9781847196286/5/ch05lvl1sec03/loss-of-redo-log-files
    If the lost redo log had the status of inactive it is not critical. It is just enough to logically remove the group and rebuild it. On the other hand, if the status of the lost redo log file was CURRENT, then the situation may get complicated as the CURRENT status means the redo log was at that time written by the LGWR process, and the DB ...
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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/
    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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    https://deveshdba.wordpress.com/2016/08/22/find-redo-log-members-redo-log-file-size-redo-log-status/

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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    https://logicalread.com/oracle-11g-redo-log-file-size-is-problem-mc02/

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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    https://mindmajix.com/oracle-dba/managing-redo-log

How to Resize Redo Logs in Oracle - Ed Chen Logic

    https://logic.edchen.org/how-to-resize-redo-logs-in-oracle/
    Here in this post, I will show you how to resize redo logs from 50MB to 1GB step by step. 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.
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    https://logic.edchen.org/how-to-resize-redo-logs-in-oracle/

Oracle Database 11g: The Top New Features for DBAs and ...

    https://www.oracle.com/technical-resources/articles/database/sql-11g-transactionmanagement.html
    Until now, this powerful tool was commonly under-appreciated due to the lack of a simpler interface. In Oracle Database 11g, however, Oracle Enterprise Manager has a graphical interface to extract transaction from the redo logs using LogMiner, which makes it extremely easy to use the tool to examine and rollback transactions.
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    https://www.oracle.com/technical-resources/articles/database/sql-11g-transactionmanagement.html

Oracle Concepts - Online redo log management

    http://dba-oracle.com/concepts/online_redo_logs.htm
    Each individual redo log is assigned to a group. Oracle writes to only one online redo log group at a time. Once the online redo log(s) in that group are filled then Oracle will switch to writing the next online redo log group, and so on in a circular fashion. Each online redo log is assigned a unique sequence number.
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    http://dba-oracle.com/concepts/online_redo_logs.htm

How to change the Redo Log File size in Oracle Database ...

    https://dba12c.wordpress.com/2016/08/21/how-to-change-the-redo-log-file-size-in-oracle-database/
    Posted on August 21, 2016 August 21, 2016 by Devraj Posted in Adminstration Tagged How to change the Redo Log File size in Oracle Database. Post navigation Previous Previous post: Applying PSU patch in an Oracle 12c Dataguard Environment
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    https://dba12c.wordpress.com/2016/08/21/how-to-change-the-redo-log-file-size-in-oracle-database/

Renaming/Dropping and recreating online redo logs and ...

    https://dbakalyan.wordpress.com/2013/04/29/renamingdropping-and-recreating-online-redo-logs-and-standby-logfiles/
    We are in process of testing Dataguard with Physical standby. After we created Primary and Standby DB's we realize what we haven't put file names as per our standard. So I got the task to rename both, online redo logs and standby logs. This what I did : 1. Following is the script to identify…
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    https://dbakalyan.wordpress.com/2013/04/29/renamingdropping-and-recreating-online-redo-logs-and-standby-logfiles/

PDF Oracle Data Guard 11g Release 2

    https://www.oracle.com/technetwork/database/availability/311401-132417.pdf
    Redo Logs NSA RFS Primary Online Redo Logs Primary Database LGWR SGA Redo Buffer Active Standby Database Queries, Reports Testing & Backups MRP C o m m i t A C K Oracle Net Commit Maximum Availability Protection Mode - Controlled by NET_TIMEOUTparameter of LOG_ARCHIVE_DEST_n - Default value 30 seconds in Data Guard 11g
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