Chapter9.GT.M Database Structure(GDS)

Chapter9.GT.M Database Structure(GDS)

Table of Contents

Database File Organization with GDS

Database File Header

File Header Data Elements

Local Bitmaps

Master Bitmap

Database Structure

Tree Organization

GDS Blocks

GDS Records

GDS Keys

Compression Count

Use of Keys

Characteristics of Keys

Global Variable Names

String Subscripts

Numeric Subscripts

GDS is an FIS proprietary internal database structure used to store global variables and lock resource names. A high-level understanding of GDS can help database administrators correctly interpret GT.M logs/error messages, and maintain database metrics. You should always consult GT.M support (gtmsupport@fisglobal.com) in the unlikely event of getting database integrity issues.