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Status Future consideration
Created by Guest
Created on Sep 26, 2019

CDC for DB2LUW shall leverage HADR/pureScale features like WLB, ACR

From some of the recent experiences, it occurred to me that for CDC for DB2 LUW there could be better ways of handling HADR node/pureScale member failover. As we rely on CLI (native calls) to read source logs, the connection api (SQLConnect) does not consider driver cfg file (db2dsdriver.cfg) that contains information about failover and alternate servers. The connection api we should be using is SQLDriverConnect() which then reads from db2dsdriver.cfg to set all the connection options.

I think it's worth spending some effort in assessing this change. Currently there are CDC specific settings to account for failover that are not acceptable in some cases (like manual inventions). I don't know how QRep has this implemented, but we can give a try.

Note: This should be only source side change. For target when we change to Type 4 all the failover properties can be specified from CDC cfg tool.