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IBM Data and AI Ideas Portal for Customers

This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (

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Status Submitted
Workspace Db2
Created by Guest
Created on Sep 20, 2022

DB2 LUW should support 1GB pages on Linux x64 platform

When using VMWare as Host System for (RH) Linux we are able to configure 1GB Pages like:

sched.mem.lpage.enable1GPage = "TRUE"

On the other hand DB2 on Linux Redhat Guest System right now does only support huge (2MB) pages per IBM DB2 documentation for


· Operating system: AIX, Linux®, Windows Server

· Default: NULL, Values: Use * to denote all applicable memory regions that should use large page memory, or a comma-separated list of specific memory regions that should use large page memory. Available regions vary by operating system.

· Db2 uses the term "large pages" generically, whereas operating systems use the terms "large" and "huge" to reference both specific and various larger hardware-dependent page sizes. A "large" or "huge" OS page size is not the same size on all OS/hardware platforms, and these terms may refer to multiple page sizes on a given OS/hardware platform.

· The DB setting applies to the DATABASE_MEMORY region and enables the following page sizes: AIX - large (16MB) pages, Linux x64 - huge (2MB) pages, and Windows - large (2MB) pages.- The DB:16GB setting is available on AIX only, which enables huge (16GB) pages for the DATABASE_MEMORY region.

We would like to configure 1GB pages on the Linux Guest System in order to match the VMWare Setting as other database vendors support it already. We expect a performance benefit by doing this.

Needed By Yesterday (Let's go already!)