The TDSERVERDB database is specifically created during the Teradata QueryGrid installation process to store the definitions and parameters of foreign servers. When an administrator uses the CREATE SERVER or ALTER SERVER DDL statements to manage connections to remote systems, the metadata for these foreign server objects is created and maintained within tables inside the TDSERVERDB database. This database acts as the central repository for all QueryGrid foreign server configurations on the Vantage system.

A. TDSYSFNLIB: This system database contains system functions, operators, and user-defined functions (UDFs), not the definitions for foreign servers used by QueryGrid.

C. TDFOREIGNDB: This is not a standard database created or used by the Teradata QueryGrid software for storing foreign server definitions.

D. SECADMIN: This is typically a user-defined database or user for security administration tasks and does not hold system-level QueryGrid configuration objects.

1. Teradata QueryGrid: Installation and User Guide, 02.08, Document ID: B035-5800-028K, Chapter 3: Installing Teradata QueryGrid Software on Teradata Database, Section: "Running the post-installation script".

This section details the tdqg-database-setup.sql script, which explicitly creates the TDSERVERDB database. The guide states, "The TDSERVERDB database contains the foreign server objects."

2. Teradata Vantage™ SQL Data Definition Language Syntax and Examples, Document ID: B035-1144-B20K, Chapter 2: Data Definition Statements, Section: "CREATE SERVER".

The documentation for the CREATE SERVER statement explains its function in defining a foreign server. It notes that the resulting foreign server object is stored in the TDSERVERDB database, which must exist before the statement can be used. For example, it specifies, "The foreign server object is created in the TDSERVERDB database."