There are five stores in the SAP Sybase IQ database.
Catalog Store (for metadata)
The catalog store is also known as the database file since it has a .db file extension. It may also be referred to as the catalog.
IQ Main Store (for data)
The IQ store holds all the user data (indexes) for the database compressed on disk.
RLV Store (for in-memory data)
The row-level versioning (RLV) store is an in-memory store for high-performance row-level updates. If a table is registered for RLV storage, then all LOAD TABLE, INSERT, UPDATE, and DELETE commands write directly to the RLV store.