Home
AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
Disk, memory, and process management
Data storageThe database server uses physical units of storage to allocate disk space. It stores data in logical units. Unlike the logical units of storage whose size fluctuates, each of the physical units has a fixed or assigned size that is determined by the disk architecture.
PagesA page is the physical unit of disk storage that the database server uses to read from and write to HCL® OneDB® databases.

Pages

A page is the physical unit of disk storage that the database server uses to read from and write to HCL® OneDB® databases.

The following figure illustrates the concept of a page, represented by a darkened sector of a disk platter.

This figure shows a disk with one small darkened sector. — Figure 1: A page on disk

On most UNIX™ platforms, the page size is 2 KB. On Windows™, the page size is 4 KB. Because your hardware determines the size of your page, you cannot alter this value.

A chunk contains a certain number of pages, as the following figure illustrates. A page is always entirely contained within a chunk; that is, a page cannot cross chunk boundaries.

The paragraph that precedes this figure describes the content of the figure. — Figure 2: A chunk, logically separated into a series of pages

For information about how the database server structures data within a page, see the chapter on disk structures and storage in the HCL OneDB Administrator's Reference