Replication Server supports the in-memory and relaxed-durability database Adaptive Server feature.
In-memory databases (IMDB) reside entirely in cache and do not use disk storage for data or logs, and therefore do not require disk I/O. This results in potentially greater performance than a traditional disk-resident database (DRDB), amongst other advantages. Since an in-memory database exists only in cache, you cannot recover the database if the supporting host is shut down or the database fails.
With relaxed-durability databases, Adaptive Server extends the performance benefits of an in-memory database to disk-resident databases. Disk-resident databases perform writes to disk, and ensure that the transactional properties of atomicity, consistency, integrity, and durability, known as the ACID properties, are maintained. A traditional disk-resident database operates at full durability to guarantee transactional recovery from a server failure. Relaxed-durability databases trade the full durability of committed transactions for enhanced runtime performance for transactional workloads. A relaxed-durability database created with the no_recovery level is similar to an in-memory database: you cannot recover data or logs if the server terminates or is shut down. You can also create a relaxed-durability database with the at_shutdown level where transactions are written to disk if there is a proper shut down of the database.
See Adaptive Server Enterprise In-Memory Database Users Guide.
Replication Server supports as the primary and replicate database:
For convenience, relaxed-durability databases refers to relaxed-durability databases with durability set to no_recovery.
You can initialize an in-memory and a relaxed-durability database as a new primary or replicate database by obtaining data, object schema, and configuration information from one of:
The dump source database can be another in-memory database, relaxed durability database, or a traditional disk-resident database.
In addition, there is no difference in performance when replicating to or from an in-memory or relaxed durability database compared to replication between primary and replicate databases which are traditional full durability disk-resident databases.