online redo log files in oracle 11g

online redo log files in oracle 11g

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What Is the Redo Log? - Oracle

    https://docs.oracle.com/cd/B28359_01/server.111/b28310/onlineredo001.htm
    What Is the Redo Log? 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 …
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    https://docs.oracle.com/cd/B28359_01/server.111/b28310/onlineredo001.htm

Redo Log Data Dictionary Views - Oracle

    https://docs.oracle.com/cd/B28359_01/server.111/b28310/onlineredo009.htm
    Redo Log Data Dictionary Views . The following views provide information on redo logs.
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    https://docs.oracle.com/cd/B28359_01/server.111/b28310/onlineredo009.htm

How to resize the redo logfile /online redo logfile in ...

    https://ampersandacademy.com/tutorials/oracle-admin-1/resize-the-redo-logfile-online-redo-logfile
    How to resize the redo logfile /online redo logfile in Oracle 11g? Let us we discuss How to resize the redo logfile /online redo logfile in Oracle 11g? The redo logfile contains the history of changes data in database < Oracle allows you to have more than one copy of each redo log file, This important feature is called "multiplexing redo log ...
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    https://ampersandacademy.com/tutorials/oracle-admin-1/resize-the-redo-logfile-online-redo-logfile

How to Manage Oracle Redo Logfiles - ORACLE DBA Online

    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

Recovering After the Loss of Online Redo Log Files: Scenarios

    https://web.stanford.edu/dept/itss/docs/oracle/10gR2/backup.102/b14191/recoscen008.htm
    Recovering After the Loss of All Members of an Online Redo Log Group. If a media failure damages all members of an online redo log group, then different scenarios can occur depending on the type of online redo log group affected by the failure and the archiving mode of the database.
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    https://web.stanford.edu/dept/itss/docs/oracle/10gR2/backup.102/b14191/recoscen008.htm

Ask TOM "Lost all Redo log file" - Oracle

    https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1817039200346240329
    Lost all Redo log file; Breadcrumb. Announcement. ... All Redo log files including the active one ,are dropped from the OS. ... After recovery database in mount status the redo files are created by oracle process itself as the naming conventions are already in controlfile.
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    https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1817039200346240329

Managing The Redo Log - Oracle DBA | Redo Log Management

    https://mindmajix.com/oracle-dba/managing-redo-log
    04/03/2017 · Multiplexed redo log files: The online redo log of a database instance should consist of multiplexed groups of online redo log files as shown below: In the above figure a_log1 and b_log1 are both members of group 1, a_log2 and b_log2 are both members of group 2, and so forth. Each member in a group must be exactly the same size.
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    https://mindmajix.com/oracle-dba/managing-redo-log

RMAN recovery from loss of all online redo log files ...

    https://gavinsoorma.com/2009/07/rman-recovery-from-loss-of-all-online-redo-log-files/
    MAA best practices dictates that to avoid such scenarios, we should be multiplexing the online redo log files. Each group should have at least 2 members and each member should be located on a different physical disk. Loss of a single current online redo log file will require us to restore the entire database and do an incomplete recovery.
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    https://gavinsoorma.com/2009/07/rman-recovery-from-loss-of-all-online-redo-log-files/

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

    https://community.oracle.com/thread/2613336
    16/12/2013 · What is the best practice for online redo log files ? 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.
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    https://community.oracle.com/thread/2613336

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