Relocating pages that are pinned in a buffer pool in a...

Details Relocating pages that are pinned in a buffer pool in a... Relocating pages that are pinned in a buffer pool in a...

G - Physics

06

F

G06F 12/02 (2006.01) G06F 12/12 (2006.01) G06F 17/30 (2006.01)

Patent

CA 2419900

A system and method for directing a database management system to relocate buffer pages that are pinned in a buffer pool in a data processing system. Each of the buffer pages have a respective page descriptor for indicating the location of the buffer page in the buffer pool. Once the pages are relocated, the now free system memory of the buffer pool is resized. Prior to resizing, a selected pinned page is latched by an agent of the system, wherein the selected page of the buffer pages is in a resize region of the buffer pool. The pinned and latched page thereby becomes a fixed page. The agent for the database management system, such as a determinator module, also determines a suitable relocation region of the buffer pool for the fixed page, and a resizer module coupled to the determinator module copies the contents of the fixed page to the relocation region and changes the respective page descriptor to indicate the relocation region. The resizer module performs the relocation for other pages in the resize region to allow dynamic resizing of the buffer pool, while maintaining the presence of pinned versions of the pages in the buffer pool prior to resizing.

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