book

Oracle Database Transactions and Locking Revealed: Building High Performance Through Concurrency

Name: Oracle Database Transactions and Locking Revealed: Building High Performance Through Concurrency
ISBN: 9781484264256

by Darl Kuhn, Thomas Kyte

October 2020

Intermediate to advanced

289 pages

6h 22m

English

Apress

Content preview from Oracle Database Transactions and Locking Revealed: Building High Performance Through Concurrency

D. Kuhn, T. KyteOracle Database Transactions and Locking Revealedhttps://doi.org/10.1007/978-1-4842-6425-6_8

8. Investigating Undo

Darl Kuhn¹ and Thomas Kyte²

(1)

Morrison, CO, USA

(2)

Denver, CO, USA

The Oracle database creates and manages information used to roll back (or undo) changes to the database. The most obvious use of undo is when you issue a ROLLBACK statement to undo changes to data that you don’t want committed. Here is the complete list of uses of undo:

Roll back transactions via the ROLLBACK statement
Enable read consistency
Recover the database
Analyze data as of a prior point in time using Oracle Flashback Query
Recover from logical corruptions using Oracle Flashback features

In the previous couple of chapters, ...

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