Re: Mirroring redo log groups or not ?

  • From: Tim Gorman <tim@xxxxxxxxx>
  • To: hkchital@xxxxxxxxxxxxxx
  • Date: Tue, 07 Apr 2009 17:51:58 -0600

One situation I've witnessed....

A lot of people create the online redo log files with the file-extension of ".log". A lot of SysAdmins have a "cron"-initiated script that removes files named ".txt", ".log", ".lst", etc that are older than N days old from certain file-systems, or sometimes when a file-system is filling up someone will run a "find" command to find big text files (i.e. ".log" is a good candidate) and get rid of them. Put the two together and you've got the perfect storm.

For my part, I always use the file-extension of ".rdo" or just plain old ".dbf", but never ".log". Of course, someone can still remove files with those extensions, but I feel the probability is smaller...

Tim Gorman
consultant - Evergreen Database Technologies, Inc.
P.O. Box 630791, Highlands Ranch CO  80163-0791
website   = http://www.EvDBT.com/
email     = Tim@xxxxxxxxx
mobile    = +1-303-885-4526
fax       = +1-303-484-3608
Yahoo IM  = tim_evdbt



Hemant K Chitale wrote:
VERY TRUE.  I've never bought the argument that mirroring online redo logs is a 
protection from DBA error.

---  wrote:
There is no protocol that can protect you from human error bysomeone with
authority to remove an online log file.

<snip>
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