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Re: Checkpoint less frequently

From: Greg Hudson <ghudson_at_MIT.EDU>
Date: 2003-02-21 18:56:44 CET

On Fri, 2003-02-21 at 12:52, Branko ╚ibej wrote:
> You don't have to stop any servers, or anythng. Each server only has to
> ask the monitor if it may open the database, and to notify it when it
> closes it. When the monitor detects a crashed process, it starts denying
> access to the database until all other processes have backed out, runs
> recovery, then allows access again.

> At least, that's the general idea.

That doesn't seem very general.

  Process A opens the database
  Process A acquires many fine locks
  Process B opens the database
  Process A crashes

Process B is just as likely to hit a stale lock and hang as if it had
opened the database after the crash.

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Received on Fri Feb 21 18:57:30 2003

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