RE: MS SQL hasn't given up!

Rich - on your first point - that's why you would choose to mirror the transaction log in SQeal Server. Same effect.

the transaction log is a fixed size. it can be extended while the db is online. but shrinking it is quite a bother (at least was back in the day - it's been a while). if the transaction log fills up all DML stops. database still recoverable though. just need to clean out or extend the log and all is well again.

no snapshot too old errors though ;-)

> -----Original Message-----
> From: Jesse, Rich [SMTP:Rich.Jesse_at_qtiworld.com]
> Sent: Friday, February 28, 2003 12:14 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: MS SQL hasn't given up!
>
> Yes and no. If your logs are backed up every 30 minutes, then you are
> effectively saying that you are willing to lose up to 30 minutes of
> transactions, in the event of failure on the TX logs (e.g. hardware).
> OTOH,
> Oracle can easily be made to be completely recoverable up to the last
> transaction ("no data lost") by duplicating, triplicating, etc. both the
> online redos and the archives.
>
> Also, isn't the transaction log area in SQueaL Server in the DB itself and
> at a fixed size (as opposed to Oracle, where you can add redo groups
> on-the-fly)? In other words, if it fills up, what happens? Does it get
> overwritten or does the DB continue in an unrecoverable mode?
>
> Trying to understand more of this wonderful Enterprise product...
>
> Rich
>
>
> Rich Jesse System/Database Administrator
> rich.jesse_at_qtiworld.com Quad/Tech International, Sussex, WI USA
>
>
> -----Original Message-----
> Sent: Friday, February 28, 2003 11:05 AM
> To: Multiple recipients of list ORACLE-L
>
>
> Sorry but point 7 isn't exactly true.
>
> Transaction logging does take place and can be backed up for reapplication
>
> to a database backup.
>
> Its not perhaps as well implemented as Oracle's but I have a system with
> the
>
> transaction log backed up every 30 minutes.
>
> The implementation is different but the effect is the same with the
> ability
> to do point in time recovery. And they do have log shipping capability in
> SQL Server 2000 (Enterprise).
>
> The point that really bothered me was the lack of multiplexing the writes
> to
>
> the transaction logs (redo). DB2/UDB has it. The MSS method (only option)
>
> is to Mirror.
>
> David
>
>
>
> >From: Jan Pruner <jan_at_pruner.cz>
> >Reply-To: ORACLE-L_at_fatcity.com
> >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> >Subject: Re: MS SQL hasn't given up!
> >Date: Fri, 28 Feb 2003 07:19:10 -0800
> >
> >Fresh in memory because 2 days ago I had meeting with MS SQL people from
> >Microsoft.
> >I will talk about MS SQL 2000 Enterprise.
> >1. MS SQL cannot handle exception. There is nothing like EXCEPTION WHEN
> ...
> >THEN.
> >
> >2. MS SQL has nothing like package.
> >
> >3. MS SQL has nothing like partitioned table (next release in 2 years
> will
> >have)
> >
> >4. There is nothing like INSERT NOLOGGING. You have start/stop logging
> for
> >whole session.
> >
> >5. There's nothing like sequence (Well, IDENTITY column IS NOT sequence).
> >
> >6. Well, you can use undocumented function pwdencrypt and pwdcompare to
> >store
> >passwords (the same hash function for storing users password is using MS
> >SQL)
> >:-)
> >
> >7. There is nothing like ARCHIVE MODE in MS SQL.
> >
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jesse, Rich
> INET: Rich.Jesse_at_qtiworld.com
>
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