IBM 000-8697 What Happens During Shared-Memory Initialization

2-10 IBM Informix OnLine Database Server Administrator’s Guide
What Happens During Shared-Memory Initialization
Disk Space Commands
You can direct OnLine to initialize disk space (and automatically initialize
shared memory) in any one of three ways:
■tbinit -i (UNIX command line)
■tbinit -i -s (UNIX command line)
■Parameters menu, Initialize option (DB-Monitor)
When you initialize disk space, all existing data on the disk you are initial-
izing is destroyed.
Ifyou use only the -i option, OnLine is left in online mode after initialization.
Ifyou use both the -i and -s options, OnLine is left in quiescent mode. If you
initialize OnLine via DB-Monitor, OnLine is left in quiescent mode.
What Happens During Shared-Memory Initialization
Thetbinit process initializes shared memory, without initializing disk space,
when userinformix or root executes any one of the following commands:
■tbinit
■tbinit -p
■tbinit -s
■tbinit -p -s
You can execute any one of these commands from theUNIX prompt. If you
initialize shared memory from withinDB-Monitor, the tbmonitor process
executestbinit -s for you, either from the Parameters menu, Shared-Memory
option,or from the Mode Menu, Startup option. Refer to page 2-8 for further
information about each of thetbinit command-line options.
Thefollowing list outlines the main tasks completed during shared-memory
initialization.