CCX will keep your system updated with the latest security patches for both the operating system and the database software.
You will be informed when there is a pending update and you have two options:
- Apply the update now – the upgrade will start immediately.
- Schedule a time for the update – the upgrade will start at a time (in UTC) and on a day that suits the application.
The update will be performed using a roll-forward upgrade algorithm:
- The oldest replica (or primary if no replica exists) will be selected first.
- A new node will be added with the same specification as the oldest node and join the datastore.
- The oldest node will be removed.
- 1-3 continues until all replicas (or primaries in case of a multi-primary setup) are updated.
- If it is a primary-replica configuration then the primary will be updated last. A new node will be added, the new node will be promoted to become the new primary, and the old primary will be removed.
Note
For primary-replica configurations, the update will cause the current primary to be changed.