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ASE Sybase with replication towards zero downtime for maintenance, upgrades

The setup includes (ASE Sybase 15.7) primary, standby with replication. They are hosted on the Sun Solaris (SPARC 64-bit). The requirement is to further enhance it towards zero downtime for maintenance, upgrades etc. (Replication needs to be retained)

There was a feeling that there may be a database HA solution with replication and have found HADR which seems a bit close but would require upgrades and additional costs for licensing. So, we are trying to look at other possible options at the present time. I have also been reviewing some interesting topics like 1) replication with mirroring (may not be the best solution) 2) Detach and attach database (MS-SQL).

Please make suggestions and recommendations.

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