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- Redo_log abstract "In the Oracle RDBMS environment, redo logs comprise files in a proprietary format which log a history of all changes made to the database. Each redo log file consists of redo records. A redo record, also called a redo entry, holds a group of change vectors, each of which describes or represents a change made to a single block in the database.For example, if a user UPDATEs a salary-value in a table containing employee-related data, the DBMS generates a redo record containing change-vectors that describe changes to the data segment block for the table. And if the user then COMMITs the update, Oracle generates another redo record and assigns the change a "system change number" (SCN).Whenever something changes in a datafile, Oracle records the change in the redo log. The name redo log indicates its purpose: If the database crashes, the RDBMS can redo (re-process) all changes on datafiles which will take the database data back to the state it was when the last redo record was written. DBAs use the views V$LOG, V$LOGFILE, V$LOG_HISTORY and V$THREAD to find information about the redo log of the database. Each redo log file belongs to exactly one group (of which at least two must exist). Exactly one of these groups is the CURRENT group (can be queried using the column status of v$log). Oracle uses that current group to write the redo log entries. When the group is full, a log switch occurs, making another group the current one. Each log switch causes checkpoint, however, the converse is not true: a checkpoint does not cause a redo log switch. One can also manually cause a redo-log switch using the ALTER SYSTEM SWITCH LOGFILE command.".
- Redo_log wikiPageExternalLink onlineredo.htm.
- Redo_log wikiPageID "11728727".
- Redo_log wikiPageLength "9412".
- Redo_log wikiPageOutDegree "19".
- Redo_log wikiPageRevisionID "671162654".
- Redo_log wikiPageWikiLink Category:Oracle_software.
- Redo_log wikiPageWikiLink Category:Transaction_processing.
- Redo_log wikiPageWikiLink Change_data_capture.
- Redo_log wikiPageWikiLink Change_vector.
- Redo_log wikiPageWikiLink Computer_data_storage.
- Redo_log wikiPageWikiLink DBMS.
- Redo_log wikiPageWikiLink Data_recovery.
- Redo_log wikiPageWikiLink Database.
- Redo_log wikiPageWikiLink Database_tuning.
- Redo_log wikiPageWikiLink Oracle_Corporation.
- Redo_log wikiPageWikiLink Oracle_Data_Guard.
- Redo_log wikiPageWikiLink Oracle_Database.
- Redo_log wikiPageWikiLink Oracle_Flashback.
- Redo_log wikiPageWikiLink Oracle_LogMiner.
- Redo_log wikiPageWikiLink Oracle_database.
- Redo_log wikiPageWikiLink Point-in-time_recovery.
- Redo_log wikiPageWikiLink Primary_memory.
- Redo_log wikiPageWikiLink RDBMS.
- Redo_log wikiPageWikiLink Relational_database_management_system.
- Redo_log wikiPageWikiLink System_Global_Area.
- Redo_log wikiPageWikiLink Tablespace.
- Redo_log wikiPageWikiLinkText "Redo Log".
- Redo_log wikiPageWikiLinkText "Redo log".
- Redo_log wikiPageWikiLinkText "Redo".
- Redo_log wikiPageWikiLinkText "redo log".
- Redo_log hasPhotoCollection Redo_log.
- Redo_log wikiPageUsesTemplate Template:Multiple_issues.
- Redo_log wikiPageUsesTemplate Template:Reflist.
- Redo_log subject Category:Oracle_software.
- Redo_log subject Category:Transaction_processing.
- Redo_log comment "In the Oracle RDBMS environment, redo logs comprise files in a proprietary format which log a history of all changes made to the database. Each redo log file consists of redo records.".
- Redo_log label "Redo log".
- Redo_log sameAs Redo_Log_File.
- Redo_log sameAs m.02rq9df.
- Redo_log sameAs Q7306169.
- Redo_log sameAs Q7306169.
- Redo_log wasDerivedFrom Redo_log?oldid=671162654.
- Redo_log isPrimaryTopicOf Redo_log.