Dbspaces Created Automatically

When you create a database, the database server creates the following four dbspaces:

Dbspace name	Purpose	Default operating system file name
`IQ_SYSTEM_MAIN`	Main (permanent) IQ store file	`dbname.iq`
`IQ_SYSTEM_MSG`	Message log file	`dbname.msg`
`IQ_SYSTEM_TEMP`	Temporary IQ store file	`dbname.iqtmp`
`IQ_SHARED_TEMP`	Temporary IQ store	Initially, this dbspace contains no files.
`SYSTEM`	Catalog store file	`dbname.db`

The SYSTEM dbspace contains the system tables, which hold the schema definition as you build your database. It also holds a separate checkpoint log, rollback log, and optionally a write file, transaction log, and transaction log mirror, for the catalog store.

Note: In addition to these database files, the database server also uses a temporary file to hold information needed during a session. This temporary file is not the same as the IQ temporary store, and is not needed once the database server shuts down. The file has a server-generated name with the extension .tmp. Its location is determined by the TEMP environment variable, or the coordinator environment variable on UNIX.