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Old 03-30-2010, 01:03 PM   #1
Registered: Feb 2009
Posts: 33

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File modification time - question


The tail of my log is the following:

# tail LOG.033010
**INFO** Time: 19:36:15 Operations: STOP DATABASE SYSTEM initiated.
**INFO** Time: 19:36:20 Operations: STOP DATABASE SYSTEM completed successfully.
**INFO** Time: 19:46:38 Operations: START DATABASE SYSTEM initiated.
**INFO** Time: 19:46:50 Operations: START DATABASE SYSTEM completed successfully.


# ls -l log
-rw-rw---- 1 xxx xxx 77431 Mar 30 18:38 LOG.033010

So, how is it possible that some process writes to the file but file time modification still remains untouched?

Thank you

Last edited by laki47; 03-30-2010 at 01:06 PM.
Old 03-30-2010, 01:15 PM   #2
Registered: Apr 2006
Location: Washington
Distribution: Suse, CentOS, Ubuntu
Posts: 124

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is the time off on the machine writing to the file?
1 members found this post helpful.
Old 03-30-2010, 02:00 PM   #3
Registered: Aug 2009
Location: Ilkeston, England
Distribution: ubuntu, xp, embeded
Posts: 79

Rep: Reputation: 1
I don't know how linux handles it, but two guesses are

1: The database has an internal clock adjusted so that it is a constant and doesnt change when the clocks do.

2: The amended date/time of a file is only done when the file is closed or a specific type of write is issued, so while some buffered writes (from the cache) show up in tail the OS hasnt amended the time because the file never closed or there are oustanding cache writes pending (this would be my guess otherwise the OS would be doing nothing but updating the last changed time on a quickly changing file) perhaps its an option of the FS on the disk?


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