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- From: dhepner@cup.hp.com (Dan Hepner)
- Newsgroups: comp.databases
- Subject: Re: Hot Standby DBMS's
- Message-ID: <BuBnqw.DIw@cup.hp.com>
- Date: 9 Sep 92 17:40:07 GMT
- References: <1992Sep9.112749.11492@uk03.bull.co.uk>
- Sender: news@cupnews0.cup.hp.com
- Organization: Hewlett-Packard
- Lines: 43
- X-Newsreader: Tin 1.1scd1 PL4
-
- From: dboyce@hemel.bull.co.uk (David Boyce)
-
- >Obviously, any given DB vendor could (given sufficient justification)
- >implement their own RHS (Remote Hot Standby) DB. This justification is
- >work for the marketeers, one of whom I am not.
- >
- >My argument proceeds on the assumption that such justification exists,
- >in order to establish the need for an 'open' RHS protocol standard.
-
- Ok; let's grant that there is market demand for a remote hot standby
- configuration.
-
- >Owing to the increase in customer interest and use of Distributed TP
- >systems (around Tuxedo, Encina etc.) it seems inevitable that DTP-RHS
- >combined functionality will become important for some customers. These
- >are the people for whom 'such openness' is important.
-
- The question remains, of what benefit is this openness? Openness
- has three potential benefits: portability of programs, interoperability
- of programs, and interchangability of system components from different
- vendors. None of the three are intuitively obvious as benefits in
- this situation.
-
- We could also assume that a proprietary RHS could itself be XA compliant,
- capable of being part of a larger global transaction.
-
- >Since the working of RHS is based around the ability to restart
- >transactions, the extention of this into DTP involves restarting
- >Distributed transactions. This requires the cooperation of the
- >Transaction Manager - hence the need for an Open RHS protocol.
-
- The DTP style RHS is indeed based on the ability to restart txns;
- the DBMS model need not be so based.
-
- >DB vendors / Transaction Manager vendors which can offer such a
- >combination of functionality clearly have the edge in that segment of
- >the market which needs it investment).
- >David Boyce (David.Boyce@hemel.bull.co.uk)
-
- But as yet we haven't uncovered any new functionality. What we have
- are two ways of solving the same problem.
-
- Dan Hepner
-