Re: REDO LOG Concepts

  • From: "Alexander Fatkulin" <afatkulin@xxxxxxxxx>
  • To: "DBA Deepak" <oracle.tutorials@xxxxxxxxx>
  • Date: Thu, 17 May 2007 23:05:57 +1100

Deepak,

generally rm does exactly this - an unlink() system call to unlink
file from the inode.

LGWR holds an open file descriptor after open - after that LGWR
doesn't really care whenever file is linked to the inode or not.

The actual delete happens when there is no more link(-s) and no open
file descriptors.

On 5/17/07, DBA Deepak <oracle.tutorials@xxxxxxxxx> wrote:
Hi Alexander,

I do not think UNIX removes the directory entry immediately. Otherwise how
would it access the REDO logs by their paths.

What might be happening is UNIX is marking it as deleted (may be using a
flag or so). Please do correct me if am wrong.

Deepak


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Alexander Fatkulin
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