IBM 000-8697 User Manual

Operating OnLine

You can determine the current OnLine mode by executing tbstat. The mode
is displayed in the header. The mode also appears in the status line displayed
in

DB-M

onitor.

When OnLine is in offline mode, it is not running. OnLine must be offline when
you initiate a data restore.

When OnLine is in quiescent mode, no user can start a database server process.
Only user informix can access the administrative options of

DB-M

onitor.

Administrative procedures that require a pause in database activity are
performed when OnLine is in quiescent mode. Quiescent mode cannot be
considered a “single-user” mode since any user can gain access to

DB-M

onitor or run tbstat. User root can execute command-line utilities while

OnLine is in quiescent mode.

When OnLine is in online mode, access is unrestricted. You can change many
OnLine configuration parameter values while OnLine is online if you use the
command-line utilities instead of

DB-M

onitor.

Recovery mode occurs when OnLine is moving from offline to quiescent mode.
Fast recovery is performed when OnLine is in recovery mode. (Refer to

 for further information about fast recovery.)

(It is possible for a mirrored chunk to be in recovery state, but this is different
than OnLine recovery mode.)

Shutdown mode occurs when OnLine is moving from online to quiescent
mode or from online (or quiescent) to offline mode. Once shutdown mode is
initiated, it cannot be cancelled.