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Multiple Logical standby [message #656097] Thu, 22 September 2016 09:05 Go to next message
caprikar
Messages: 226
Registered: March 2007
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Hi,
I have a logical standby database setup from primary and the standby database is a superset of primary database. We have a requirement to build another Logical standby database from the existing logical database and make the primary apply the logs to both the logical standby database. Is that is possible?

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Re: Multiple Logical standby [message #656102 is a reply to message #656097] Thu, 22 September 2016 10:07 Go to previous messageGo to next message
Michel Cadot
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Then you build this secondary standby from the primary like you did it from the first one.

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Re: Multiple Logical standby [message #656107 is a reply to message #656102] Thu, 22 September 2016 12:15 Go to previous messageGo to next message
caprikar
Messages: 226
Registered: March 2007
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The issue is, the existing logical standby database data is super set of the primary, so we need to have the data same as the logical standby database.

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Re: Multiple Logical standby [message #656108 is a reply to message #656107] Thu, 22 September 2016 12:21 Go to previous messageGo to next message
Michel Cadot
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So the second standby is a standby of the first standby and not of the primary and so must be updated when the first standby is updated and not when the primary is but if your system is well tuned and configured, it is the same thing.

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Re: Multiple Logical standby [message #656109 is a reply to message #656108] Thu, 22 September 2016 12:27 Go to previous messageGo to next message
BlackSwan
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>The issue is, the existing logical standby database data is super set of the primary,
post DDL that resulted in this "super set" of the primary

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Re: Multiple Logical standby [message #656110 is a reply to message #656108] Thu, 22 September 2016 12:48 Go to previous messageGo to next message
caprikar
Messages: 226
Registered: March 2007
Senior Member
so, are you saying it is possible to build a logical standby database from another logical standby db? let me know.

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Re: Multiple Logical standby [message #656112 is a reply to message #656110] Thu, 22 September 2016 12:59 Go to previous messageGo to next message
Michel Cadot
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Yes, this is possible, a logical standby is a database like any other one.

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Re: Multiple Logical standby [message #656116 is a reply to message #656110] Fri, 23 September 2016 01:21 Go to previous message
John Watson
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Registered: January 2010
Location: Global Village
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You may be able to make this work (search for "cascading standby") but it is not supported. In release 12 cascading standby is supported, but only for physical standbys, not logical.

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