?
Solved

Alter system checkpoints

Posted on 2006-06-29
8
Medium Priority
?
1,024 Views
Last Modified: 2012-06-27
I have one trivial doubt in this "alter system checkpoints."

Can i give this query while taking hot backup what would be happened?

==expertblr
0
Comment
Question by:expertblr
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 19

Accepted Solution

by:
actonwang earned 172 total points
ID: 17011552
it should be "alter system checkpoint".

it should be ok if you issue this. I didn't test it. but I assume that when you issue "alter tablespace xx begin backup" all subsequenct actions will be redirected into log files.


acton
0
 
LVL 14

Assisted Solution

by:sathyagiri
sathyagiri earned 164 total points
ID: 17011696
Yes you could give the alter system checkpoint while doing hot back up.

As soon as you start your hot back up, the System Change Number (SCN) is frozen in your file headers and the back up program continues to work as normal. When you force a checkpoint the change still gets written to your data file however does not update the file header. This ways the recovery program identifies that the SCN in the file header is wrong and hence looks for the redo log to apply the delta changes.

Here's a good article on this one
http://www.speakeasy.org/~jwilton/hot-backup.html
0
 
LVL 8

Assisted Solution

by:gvsbnarayana
gvsbnarayana earned 164 total points
ID: 17016644
Hi,
  It's more useful to issue "Alter System Switch Log File" as it implicitly cause a check point.
Then you will have more consistent data files when compared to issueing "Alter system checkpoint"
HTH
Regards,
Badri.
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 3

Expert Comment

by:Keyurkumar
ID: 17020125
Why you want to issue that command ?
~Keyur
0
 
LVL 19

Expert Comment

by:actonwang
ID: 17021916
I think that i gave the answer in the first post lound and clear. question resolved already..

////////////////
it should be "alter system checkpoint".

it should be ok if you issue this. I didn't test it. but I assume that when you issue "alter tablespace xx begin backup" all subsequenct actions will be redirected into log files.




0
 
LVL 19

Expert Comment

by:actonwang
ID: 17021919
let me know any more question,  expertblr.

acton
0
 
LVL 1

Expert Comment

by:Computer101
ID: 20295076
Forced accept.

Computer101
EE Admin
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

I remember the day when someone asked me to create a user for an application developement. The user should be able to create views and materialized views and, so, I used the following syntax: (CODE) This way, I guessed, I would ensure that use…
This post first appeared at Oracleinaction  (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself). I  will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…
Via a live example, show how to take different types of Oracle backups using RMAN.
This video shows how to configure and send email from and Oracle database using both UTL_SMTP and UTL_MAIL, as well as comparing UTL_SMTP to a manual SMTP conversation with a mail server.

719 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