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Installation and Initial Configuration 1-11
OnLine Configuration Files
OnLine Configuration Files
You are not limited to just one configuration file. You can create and manage
multiple OnLine configuration files, and each file can contain a unique set of
configuration parameter values. This section explains how multiple configu-
ration files are created and managed.
As part of OnLine 5.x installation, the product software is loaded into the
Informix product directory, specified as the environment variable INFOR-
MIXDIR
. One of the files loaded during installation is tbconfig.std, which is
located in the directory $INFORMIXDIR/etc. The tbconfig.std filecontains the
default values for the configuration parameters and serves as the template
for all other configuration files that you create.
The OnLine environment variable TBCONFIG specifies the name of the UNIX
file (which must be located in the directory $INFORMIXDIR/etc) that is read
as input to either the disk-space or shared-memory initialization procedure.
The TBCONFIG environment variable enables you to create and maintain
multiple configuration files, each with different values. As user informix,
you can initialize OnLine shared memory with adifferent set of configuration
parameters by resetting the value of TBCONFIG.
The default value of TBCONFIG is defined as tbconfig. When you first load
the OnLine 5.x software, the file tbconfig does not exist. The tbconfig file is
created for you the first time that you initialize OnLine. If you initialize from
within DB-Monitor, the tbconfig file contains the parameter values entered as
part of initialization. If you initialize from the command line, using the
OnLine utility tbinit, the tbconfig file contains default values obtained from
tbconfig.std.
You set the value of TBCONFIG when you define the environment variables
as one of your last tasks during installation.
You can modify the configuration file from within DB-Monitor while OnLine
is online. The changes you make are written immediately to the file specified
as TBCONFIG.IfTBCONFIG is not specified, OnLine modifies the file tbconfig.
But even though the values in the file change, most changes to the parameter
values do not take effect until you reinitialize OnLine shared memory. Until
you take this step, it is possible that the values in the file specified as
TBCONFIG do not match the values in your current, effective configuration.