Topic: Database Administration >> SCN
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| Tina |
Posted: Apr 12, 2007 02:19:38 PM |
Total Post: 9
Joined: Apr, 2007
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What is the different between SCN and check point sequence number?
When SCN is generated? Which files are udated when SCN is generated? How can i view SCN?
How many types of SCN is there and when they occur?
Please reply with detailed answer as i am quite confuse with SCN...
Thanks,
Tina K.
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 Sabdar Syed |
| Posted: Apr 12, 2007 03:18:17 PM |  |
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Total Post: 39
Joined: Mar, 2007
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The system change number (SCN) is an ever-increasing value that uniquely identifies a committed version of the database. Every time a user commits a transaction, Oracle records a new SCN. You can obtain SCNs in a number of ways, for example, from the alert log. You can then use the SCN as an identifier for purposes of recovery. For example, you can perform an incomplete recovery of a database up to SCN 1030. Oracle uses SCNs in control files, datafile headers, and redo records. Every redo log file has both a log sequence number and low and high SCN. The low SCN records the lowest SCN recorded in the log file, while the high SCN records the highest SCN in the log file.
To know more about Checkpoint, plase take a look at the below URL.
http://www.adp-gmbh.ch/ora/concepts/checkpoint.html
Regards,
Sabdar Syed
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| Ratnaker |
| Posted: Apr 13, 2007 01:42:24 AM | |
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Total Post: 141
Joined: Apr, 2007
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Sabder has given very useful information abount SCN
Ratnaker
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