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Configuration Parameter File Reference
Database
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Define InterSystems IRIS databases.
Synopsis
[Databases]    Name=a,b,c,d,e, f
Description
Each entry has up to six comma-separated arguments that define a database. The only argument that is required is the first, the directory specification. If the other arguments are not specified, then the default is used. From left to right:
By default even if they are not specified, the IRISSYS, IRISLIB, IRISTEMP, and IRISAUDIT databases must be local to the system, private mounted, and mount required at startup.
Examples
In the [Databases] section, each line is a database with arguments Name=a,b,c,d,e,f. Here is an example from Windows:
[Databases]
IRISSYS=c:\InterSystems\IRIS\mgr\
IRISLIB=c:\InterSystems\IRIS\mgr\irislib\
IRISTEMP=c:\InterSystems\IRIS\mgr\iristemp\
IRISAUDIT=c:\InterSystems\IRIS\mgr\irisaudit\
USER=c:\InterSystems\IRIS\mgr\user\
SALES=c:\sales\,SALESERVER 
; Database is on system SALESERVER
BILLING=/usr/billing/,,1                    
; Database is local and mount required
CLUSTER=dka300:[cluster],,,1      ; Database is cluster mounted
Example of remote databases without mirroring:
PRDAUDIT=c:\InterSystems\IRIS\mgr\prdaudit\,PRD
PRDDCIFC=\InterSystems\IRIS\mgr\prddata\,PRD
PRDERR=\InterSystems\IRIS\mgr\prderr\,,1 
Example of remote databases with mirroring. Note in this mirrored example the two remote databases, both mirrored and non-mirrored, are formatted differently than they would be in a non-mirrored environment.
PRDAUDIT=:mirror:PRDMIRROR:PRDAUDIT,PRD - Mirrored remote database
PRDDCIFC=:ds:PRDDCIFC,PRD - Non-mirrored remote database
PRDERR=\InterSystems\IRIS\mgr\prderr\,,1 - Local database 
Range of Values
As described above.
Management Portal
On the page System Administration > Configuration > System Configuration > Local Databases, to add a new entry, select Create New Database. To edit an existing entry, select Edit in that entry's row.