Operating OnLine 3-7
Types of OnLine Modes
You can determine the current OnLine mode by executingtbstat. The mode
isdisplayed in the header. The mode also appears in the status line displayed
inDB-M onitor.
Offline Mode
WhenOnLine is in offline mode, it is not running. OnLine must be offline when
you initiate a data restore.
Quiescent Mode
WhenOnLine is in quiescent mode, no user can start a database server process.
Only userinformix 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-Monitoror run tbstat. User root can execute command-line utilities while
OnLine is in quiescent mode.
Online Mode
When OnLine is in online mode, access is unrestricted.You can change many
OnLineconfiguration parameter values while OnLine is online if you use the
command-line utilities instead ofDB-M onitor.
Recovery Mode
Recoverymode occurs when OnLine is moving from offline to quiescent mode.
Fast recovery is performed when OnLine is in recovery mode. (Refer to
page 4-39 for further information about fast recovery.)
(Itis possible for a mirrored chunk to be in recovery state, but this is different
than OnLine recovery mode.)
Shutdown Mode
Shutdown mode occurs when OnLine is moving from online to quiescent
modeor from online (or quiescent) to offline mode. Once shutdown mode is
initiated, it cannot be cancelled.