Undo issue in LOG

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Aug 6th, 2022
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How to undo issue in LOG

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database logs are a critical component of any dbms system in order to ensure durability and crash recovery if you will so logs like uh iamp;#39;m referring to logs such as the right ahead log or wall for short wal that is uh the redo logs and the undo logs uh these are the only three that i know there might be other type of logs that are there for specific implementation but i think these are the three most popular uh in fact you can argue that the wall is actually identical to the redo logs you know and iamp;#39;m gonna talk about all of this in this episode of the backend engineering show itamp;#39;s been a while and iamp;#39;m almost recovered now so i can do videos like this yay nice coffee time speaking of coffee i partnered with a company called clemeter they do fantastic coffee you know when you brew coffee um there are so many things that you need to do uh to to nail the quantity of the beans first to grind them in a specific size how coarse how fine the the beans need to b

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REDO Information: describes how to apply the update in case the data does not make it to disk. UNDO: Information: describes how to back out the update in case the data gets to disk but shouldnt (because some other update never made it to the disk or the log).
Undo allows you to take back data entry changes by storing a collection of data maintenance actions. Redo lets you restore the change that was undone. Under certain circumstances, for example, when you change to a different client, the collection of actions ends and you can no longer use undo or redo.
About Undo Data When a transaction modifies the database, Oracle copies the original data before modifying it. The original copy of the modified data is called undo data.
3.4 Undo Tablespaces. Undo tablespaces contain undo logs, which are collections of records containing information about how to undo the latest change by a transaction to a clustered index record. Undo logs are stored in the system tablespace by default but can be stored in one or more undo tablespaces instead.
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.
An undo log is a collection of undo log records associated with a single read-write transaction. An undo log record contains information about how to undo the latest change by a transaction to a clustered index record.
In InnoDB, the undo log and the redo log are two indispensable components that play a vital role in maintaining data integrity and ensuring transactional consistency. Both logs are crucial in the ACID (Atomicity, Consistency, Isolation, Durability) properties of database systems.
To undo an action, press Ctrl + Z. To redo an undone action, press Ctrl + Y.

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