The HADR feature allows SAP ASE applications to operate with zero downtime while you are updating the SAP ASE software.
Generally, the steps for performing a rolling upgrade are:
- Upgrade the standby components
- Perform a failover
- Upgrade the components that are on standby after the failover
Complete the upgrade steps in a single sequence: partial upgrade is not supported (for example, you cannot upgrade some components now and then upgrade the other components at another time). Replication is suspended during some steps of a rolling upgrade, and if you perform a partial upgrade, logs continue to grow, which can result in logs or the SPQ running out of space. In the course of a rolling upgrade, it is not required for the SAP ASE and Replication Server versions to be identical.
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