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RE: Your views on Quest - Shareplex

From: MacGregor, Ian A. <ian_at_SLAC.Stanford.EDU>
Date: Tue, 29 May 2001 17:11:21 -0700
Message-ID: <F001.00312DEE.20010529163547@fatcity.com>

We are looking into the product as well, but have yet to even toy with the product. There is a "no chained rows" restriction. Shareplex does not replicate transactions on sys objects. A table dropped on one side will not be dropped on the other. It apparently will replicate truncates however. It's one thing to read the logs and to find the time when a truncate caused writes to the data dictionary, but quite another to reconstruct the statement.

I didn't think Quest was pushing Shareplex for disaster recovery tool but for replication.

Ian MacGregor
Stanford Linear Accelertor Center
ian_at_slac.stanford.edu

-----Original Message-----
Sent: Tuesday, May 29, 2001 1:45 PM
To: Multiple recipients of list ORACLE-L

Here's a theory: Eyal is referring to chained and migrated rows. With media recovery, the recovering instance infers where the migrated or chained data is located, becuase it is an exact physical copy. Since the SharePlex replicated instance is not an exact physical copy of the primary, it must go back to the source database to figure out which blocks' changes represent changes for a block that SharePlex already knows about.

--
Jeremiah Wilton
http://www.speakeasy.net/~jwilton

On Tue, 29 May 2001, Jared Still wrote:

>
> So how does a standby database work if the logs don't contain
> complete transactions?
>
> On Tuesday 29 May 2001 12:01, Jim Hawkins wrote:
>
> From note on MetaLink:
>
> > 1) There is not sufficient information in the logs to logically
> > replicate transactions, so the data applied to the destination system
> > may be different from the primary, and therefore inaccurate.
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jeremiah Wilton INET: jwilton_at_speakeasy.net Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: MacGregor, Ian A. INET: ian_at_SLAC.Stanford.EDU Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Received on Tue May 29 2001 - 19:11:21 CDT

Original text of this message

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