Solved

Alter system checkpoints

Posted on 2006-06-29
8
1,018 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
8 Comments
 
LVL 19

Accepted Solution

by:
actonwang earned 43 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 41 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 41 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
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.

 
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

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

Title # Comments Views Activity
Maintaining Oracle Managed Accounts 2 38
database upgrade 8 77
Oracle SQL - Query help 7 56
Email query results in HTML 6 20
Why doesn't the Oracle optimizer use my index? Querying too much data Most Oracle developers know that an index is useful when you can use it to restrict your result set to a small number of the total rows in a table. So, the obvious side…
Note: this article covers simple compression. Oracle introduced in version 11g release 2 a new feature called Advanced Compression which is not covered here. General principle of Oracle compression Oracle compression is a way of reducing the d…
This videos aims to give the viewer a basic demonstration of how a user can query current session information by using the SYS_CONTEXT function
Via a live example, show how to restore a database from backup after a simulated disk failure using RMAN.

803 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