redo log groups in oracle

redo log groups in oracle

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Using LogMiner to Analyze Redo Log Files - Oracle

    https://docs.oracle.com/cd/B19306_01/server.102/b14215/logminer.htm
    Unconditional supplemental log groups: The before-images of specified columns are logged any time a row is updated, regardless of whether the update affected any of the specified columns. This is sometimes referred to as an ALWAYS log group. Conditional supplemental log groups: The before-images of all specified columns are logged only if at least one of the columns in the …
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    https://docs.oracle.com/cd/B19306_01/server.102/b14215/logminer.htm

Creating Redo Log Groups and Members - Oracle

    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo003.htm
    To create new redo log members for an existing group, use the SQL statement ALTER DATABASE with the ADD LOGFILE MEMBER clause. The following statement adds a new redo log member to redo log group number 2: ALTER DATABASE ADD LOGFILE MEMBER '/oracle/dbs/log2b.rdo' TO GROUP 2; Notice that filenames must be specified, but sizes need not be.
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    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo003.htm

Using LogMiner to Analyze Redo Log Files - Oracle Help Center

    https://docs.oracle.com/en/database/oracle/oracle-database/19/sutil/oracle-logminer-utility.html
    The redo log files must be produced by the same source database. The redo log files must be associated with the same database RESETLOGS SCN. The redo log files must be from a release 8.0 or later Oracle Database. However, several of the LogMiner features introduced as of release 9.0.1 work only with redo log files produced on an Oracle9i or ...
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Managing the Redo Log - Oracle

    https://docs.oracle.com/cd/B19306_01/server.102/b14231/onlineredo.htm
    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://docs.oracle.com/cd/B19306_01/server.102/b14231/onlineredo.htm

What Is the Redo Log? - Oracle

    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo001.htm
    For information about redo log groups in an Oracle Real Application Clusters environment, please refer to Oracle Real Application Clusters Administration and Deployment Guide. Redo Log Contents . 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 a change …
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    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo001.htm

Dropping Redo Log Groups and Members - Oracle

    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo005.htm
    You can drop a redo log member only if it is not part of an active or current group. If you want to drop a member of an active group, first force a log switch to occur. Make sure the group to which a redo log member belongs is archived (if archiving is enabled) before dropping the member. To see whether this has happened, use the V$LOG view.
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    https://docs.oracle.com/cd/E18283_01/server.112/e17120/onlineredo005.htm

How to add and drop online redo log members and groups in Oracle - The Geek Diary

    https://www.thegeekdiary.com/how-to-add-and-drop-online-redo-log-members-and-groups-in-oracle/
    You can add new member to an existing redo log file group using the following command: ALTER DATABASE ADD LOGFILE MEMBER /DISK4/log1b.rdo' TO GROUP 1, '/DISK4/log2b.rdo' TO GROUP 2; In OMF, Adding Online Redo Log Members step is not required, as they are added automatically when ADD LOGFILE is issued. Dropping Online Redo Log Groups
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    https://www.thegeekdiary.com/how-to-add-and-drop-online-redo-log-members-and-groups-in-oracle/

Managing the Redo Log - Oracle Help Center

    https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-the-redo-log.html
    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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Redo Log Groups — oracle-tech

    https://community.oracle.com/tech/developers/discussion/205629/redo-log-groups
    you have 3 groups (default install) however you only have 1 member per group (redo01.log belongs to group 1, etc, etc) Since they all appear to be in the same directory, unless you are running some sort of fault-tolerant RAID, you may want to look at adding additional members on a different file system.
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How to add or drop redo log groups in Oracle RAC – The Geek Diary

    https://www.thegeekdiary.com/how-to-add-or-drop-redo-log-groups-in-oracle-rac/
    How to add or drop redo log groups in Oracle RAC by admin redo in RAC environment In RAC, each instance has a redo thread; when you start the instance, it mounts one and only one thread. Therefore if you want to add logs or increase the size, you must do it for each thread.
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    https://www.thegeekdiary.com/how-to-add-or-drop-redo-log-groups-in-oracle-rac/

Working with Oracle Redo Logs: A Comprehensive Guide 101

    https://hevodata.com/learn/working-with-oracle-redo-logs/
    Oracle Redo Logs are one of the principal components in the recovery operations of an Oracle database. The Redo Logs consist of two or more pre-configured files that log all the changes made to the database. This helps the database instance in the recovery of data in case of failure.
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    https://hevodata.com/learn/working-with-oracle-redo-logs/

Online Redo Log groups — oracle-tech

    https://community.oracle.com/tech/developers/discussion/425145/online-redo-log-groups
    oracle says that minimum 2 redo log groups with each one log member is required for the normal operation. The reason of having additional redo log member is multiplexing. The multiplexing of redo log member in a different disk. The present undo segments is called as rollback segments in the previous releases. The system tablespace is using ...
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