Solved

A Question about Oracle redo genaration

Posted on 2012-04-01
3
312 Views
Last Modified: 2012-09-07
Dear Experts,

Which type of DML Statments genarate more redo?

and can you tell me, Does SELECT statment also genarate redo?

Thank You in advance.
Pradeep.
0
Comment
Question by:uompradeep
  • 2
3 Comments
 
LVL 17

Expert Comment

by:Anuroopsundd
ID: 37794511
0
 
LVL 17

Expert Comment

by:Anuroopsundd
ID: 37794515
0
 
LVL 4

Accepted Solution

by:
VictorTarasov earned 500 total points
ID: 37794532
A select for update will generate both redo and undo.

A read only select will USE undo (for read consistency)

A read only select may GENERATE redo due to block cleanouts.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Truncate is a DDL Command where as Delete is a DML Command. Both will delete data from table, but what is the difference between these below statements truncate table <table_name> ?? delete from <table_name> ?? The first command cannot be …
Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.
This video explains what a user managed backup is and shows how to take one, providing a couple of simple example scripts.

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question