Redo writing in LOG

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Aug 6th, 2022
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How to redo writing in LOG

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it literally says hey la grotta please redo generation of course my connected application sessions will generate looted theyamp;#39;re going to do updates and deletes and inserts etc but I see reader generation coming out of the DB writer process why would DB writer generate redo so if this is the first youamp;#39;ve seen of this diagram Iamp;#39;ll little a video link in the description showing you how we came across the concept of private reader we need to know that we have private versus public reader in modern versions of Oracle what happens is sessions right to private reading and then the private reader will be flush to the log buffer the public log buffer and then the log writer would take care of flushing that down to the database now in the good old days when we didnamp;#39;t have private redo all the sessions would write to the log buffer and then some occasionally the database router needs to do things like a checkpoint and it needs to make sure that all those lo

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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.
UNDO is used to rollback transactions. REDO records changes to the original data, and is important for transactions that are not committed at the time of a crash or failure. REDO is used to roll forward transactions.
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 to protect the database in case of an instance failure.
Archive logs are archived redo(online) log files. In redo log files are all changes that happened to your data. If your database is in archivelog mode, than redo logs cant be overwritten, they are archived in some other location when they are full. Redo and archive logs are used in various database recovery scenarios.
To create new redo log groups and members, you must have the ALTER DATABASE system privilege. A database can have up to MAXLOGFILES groups. To create a new group of redo log files, use the SQL statement ALTER DATABASE with the ADD LOGFILE clause.
Oracle LogMiner is used to read the contents of Redo / Archive log files. In this article we will understand Oracle LogMiner configuration and query the contents of Redo / Archive log files. You can run LogMiner to read the contents of Redo / Archive log files on the same database or on a completely separate database!
The following terms will help you in understanding different types of Redo Log operations: Current Redo Log File: This is the file that LGWR is currently writing. Active Redo Log File: Redo Log file that is required for instance recovery.
Redo log files are operating system files used by Oracle to maintain logs of all transactions performed against the database. The primary purpose of these log files is to allow Oracle to recover changes made to the database in the case of a failure.

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