IBM 000-8697 Manual Do Utilizador

System Architecture

The first reserved page in the root dbspace is

PAGE_PZERO

. Below are listed

the

PAGE_PZERO

 fields and definitions. To obtain a listing of the reserved

page, execute the command tbcheck -pr.

The second reserved page in the root dbspace is

PAGE_CONFIG

. This page

contains either a copy of the configuration file specified by

 or, if

TBCONFIG

 is not set, the file

, by default. (Refer to

for a listing of all

configuration file parameters.)

The third reserved page in the root dbspace is

PAGE_1CKPT

. The fourth

reserved page,

PAGE_2CKPT

, is the second page in the pair.

The tbinit daemon uses the checkpoint and logical log file information for
checkpoint processing. The date and time of the last checkpoint, available
from the Force-Ckpt menu, is obtained from this reserved page. (Refer to

 for a complete explanation of the checkpoint procedure.)

Identity

IBM Informix OnLine copyright

Database system state

Unused

Database system flags

Unused

Page size

Page size for this machine, in bytes

Date/time created

Date and time of disk space initialization

Version number

Unused

Last modified timestamp

Unused (although a 1 appears)