Standard Engine modes

INFORMIX-SE (multi-user versions):

Can I start SE in maintenance (standalone mode) where the DBA is the only user who can access the engine, then change its mode so that all user开发者_如何学运维s can access it?

(This is analogous to booting Unix in single-user mode and then going multi-user. Oracle provides this functionality.)

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There are no modes in Informix Standard Engine (SE) analogous to those in Informix Dynamic Server (IDS).

You can connect to an SE database with:

DATABASE dbname EXCLUSIVE;

This will fail if anyone is using the database; it will prohibit anyone else from connecting to the database until the session is over - at which point anyone can connect again.