Chapter 9. GT.M Database Structure(GDS)

Revision History
Revision V7.0-00012 February 2021
Revision V6.3-01330 June 2020
Revision V6.3-00824 April 2019
Revision V6.3-00704 February 2019
Revision V6.3-00626 October 2018
Revision V6.3-00503 July 2018
Revision V6.3-00120 March 2017
  • In “File Header Data Elements ”, removed references to OpenVMS and added the descriptions of WIP queue cache blocks, DB is auto-created, DB shares gvstats. LOCK crit sharing, AsyncIO

Revision V6.0-003/119 February 2014

In “File Header Data Elements ”, updated the descriptions for V6.0-003.

Revision V6.0-00327 January 2014

In “GDS Blocks ”, corrected the description of block header fields.

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 ( in the unlikely event of getting database integrity issues.


This chapter provides a high-level overview of GDS components. A comprehensive description of all the components of GDS is beyond the scope of this chapter.

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