Data store topologies
The topology defines the relative location of a data store and its messaging engine, as well as the relationship with other data stores.
You have several options for the relative location of a data store and its messaging engine. The following principles apply:
- The default embedded Apache Derby data store always runs in the same server process as the messaging engine.
- For a messaging engine that can fail over within a WebSphere Application Server cluster, you must ensure that, for any server that the policy might choose to run, the messaging engine can gain access to the data store. The embedded Apache Derby data store is not supported for a messaging engine running in a cluster. Use either Apache Derby in Network Attach mode, or an alternative relational database management system.
To support high availability (HA), we can configure the data store as follows:
- Configure the data store to use a shared, network-mounted, file system. Ensure that you protect against the file system being a single point of failure.
- Configure the data store to use a remote database server. Ensure that you protect against a failure of the database server.
- Configure the data store to use a shared disk in an HA cluster. The HA cluster performs failover of the data store and, optionally, can coordinate failover of the messaging engine.
Related concepts
Configuration planning for a messaging engine to use a data store Data stores