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Home -> Community -> Mailing Lists -> Oracle-L -> Re[2]: A high-availability question (standby , replication o
Do not also forget about TNSNAMES or Oracle Names in your fail over strategy as they will not switch over by themselves.
The only other way that I know of to do what you initially stated is to use Oracle Parallel server with EMC's storage systems. Now I have not seen this although they state that it is possible and they have tried it in a limited manner. What you have is a server connected to an EMC array at each site with a dedicated T1 in between the EMC arrays. They place software into the array that maintains two active copies of the data one at each site. Oracle cross communicates via a second dedicated T1 so that the servers believe they are right next to each other. Then all you need is a third T1 or better between the sites so that when the first server dies the second can pick up where the original left off.
I've seen a demo or OPS's capabilities in fail over & was VERY impressed. The demo consisted of establishing a SQL*Plus session on one server (they were HP-9000) and select rownum, * from some_million_row_table. Then in the middle of the SQL session getting the data, somewhere around rownum 5000, the Oracle rep switched off the server we were connected to. Well you know what I expected, but no, the session just paused for about half a second and then continued without missing a beat or rownum. Absolutely amazing.
Down Side, have VERY DEEP pockets. And if your going to do it with EMC, have two pockets!!!
Dick Goulet
____________________Reply Separator____________________ Author: "Rachel Carmichael" <carmichr_at_hotmail.com> Date: 8/16/2001 9:06 AM
Standby... even if I have to be paged in the middle of the night to bring it up and live.
replication is a nightmare to implement unless you plan for it. Standby is a breeze to implement and maintain.
>From: Andrey Bronfin <andreyb_at_elrontelesoft.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: A high-availability question (standby , replication or ....)
>Date: Thu, 16 Aug 2001 08:11:09 -0800
>
>Dear gurus !
>
>A customer wants to have a backup database on a remote "in case of
>disaster"
>site.
>That database needs to be as much in sync with the primary DB as possible,
>and a sort of failover must be implemented ,
>i.e. if the primary site fails , the users will be AUTOMATICALLY routed to
>the secondary one .
>
>I thought of 2 possible approaches :
>multimaster asynchronous replication and a standby database.
>The problem is that AFAIK , there is no automatic failover in case of
>standby DB , i.e.. U need to issue "ALTER DATABASE ACTIVATE STANDBY
>DATABASE; " or something like that on a backup site.
>From the other hand multimaster replication sounds like a big headache .
>
>So , gurus , what would U suggest ?
>How do U implement HA on your sites ?
>
>Thanks a lot in advance for your time.
>
>Andrey.
>
>
>
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Andrey Bronfin
> INET: andreyb_at_elrontelesoft.com
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rachel Carmichael INET: carmichr_at_hotmail.com 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: INET: dgoulet_at_vicr.com 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 Thu Aug 16 2001 - 11:35:43 CDT
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