IBM 000-8697 What Happens During Disk-Space Initialization

2-14 IBM Informix OnLine Database Server Administrator’s Guide
What Happens During Disk-Space Initialization
Step 9: Document Configuration Changes
Thetbinit daemon compares the values stored in the configuration file with
thevalues formerly stored in the root dbspace reserved page PAGE_CONFIG.
Wheredifferences exist, tbinit notes both values (old and new) in a message
written to the OnLine message log. This action is for documentation only;
tbinithas already written the new values from the configuration file into the
root dbspace reserved page.
Step 10: Check for Forced Residency
Thetbinit daemon reads the value of RESIDENT, the configuration parameter
that describes shared-memory residency. IfRESIDENT is set to 1, tbinit calls
thetbmode utility process, which tries to enforce residency of shared
memory. If the hostUNIX system does not support forced residency, the
initializationprocedure continues and residency is not enforced. An error is
returned.
Step 11: Begin Looping as Master Daemon
Setting residency is the last initialization task that the daemon performs.
After the RESIDENT parameter is processed, thetbinit daemon remains
running indefinitely. From this point forward,tbinit serves as the OnLine
master daemon.
What Happens During Disk-Space Initialization
Thetbinit process initializes disk space when user informix or root executes
either of the following commands:
■tbinit -i
■tbinit -i -s
You can execute either of these commands from theUNIX prompt. If you
initialize shared memory from withinDB-Monitor, the tbmonitor process
executestbinit -i -s from the Parameters menu, Initialize option. Refer to
page 2-8 for further information about each of thetbinit command-line
options.