Read/write database includes utilities and data related to system management. It is intended to contain specific custom code and data of yours and to preserve that code and data upon upgrades.
This database contains or can contain:
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Users, roles, and other security elements (both predefined items and ones that you add).
For reasons of security, the Management Portal handles this data differently than other data; for example, you cannot display a table of users and their passwords.
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Data for use by the NLS (National Language Support) classes: number formats, the sort order of characters, and other such details. You can load additional data.
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Your own code and data. To ensure that these items are preserved upon upgrades, use the naming conventions in Custom Items in IRISSYS.
Caution:
InterSystems does not support moving, replacing, or deleting the IRISSYS database.
The directory that contains this database is the system manager’s directory. The messages log (messages.log) is written to this directory, as are other log files.
For additional detail on IRISSYS, see Using Resources to Protect Assets.