auto rollback

Reprinted from: http://blog.csdn.net/leshami/article/details/5731158One, rollback (ROLLBACK) and undo (undo)Rollback and roll forward are important means of ensuring that the data in an Oracle database is in a consistent state. --Before the 9i

1. Use multiple rollback segments Use multiple rollback segments to share contention for rollback segments to improve system performance. The system uses loops to allocate the rollback segment. When Oracle creates a database, the system

1. Concepts Transaction uses the extent in the rollback segment in a round-robin manner. When the current extent is full, it is moved to the next extent. Multiple transactions may write data to the same extent at the same time, but only one

Rebuild the rollback tablespace and the rollback tablespace Author: iamlaosong The data in the rollback segment is not submitted due to unexpected reasons (power loss or manual killing), and a large amount of data retained in the rollback segment

The data in the rollback segment is not submitted due to unexpected reasons (power loss or manual killing), and a large amount of data retained in the rollback segment cannot be removed. The method I have come up with is to recreate the tablespace.

The following is from: http://lovexueer.itpub.net/post/5072/49241 December 26 (Monday) Test environment: Os:xp db:9201 This test tests the following conditions: A. Normal shutdown database, database (not) archive, rollback segment table space lost,

How to test transactions and test transaction rollback conditions:I have done a lot of different tests:Scenario 1:The service layer uses annotations @transactional, annotations @persistencecontext private Entitymanager emt;wrote two ways.Publicvoid

Main content :Data Definition Language DDL FocusData manipulation language DML FocusDQL Focus of data query language---transaction control language TCL---database control Language DCL---primary key (primary key)---data redundancy (a separate table

One, rollback (ROLLBACK) and undo (undo) Rollback and roll forward are important means of ensuring that data in an Oracle database is in a consistent state. Before the 9i version Oracle uses rollback segments in the database to implement

ORA-01552: cannot use system rollback segment for... error resolvedFault symptom:Today, the database is not completely restored, but several tables need to be created as the base table for recovery when preparing the environment. When creating a