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.
ChunksA chunk is the largest unit of physical disk dedicated to database server data storage.
Disk allocation for chunksThe database server can use regular operating-system files or raw disk devices to store data. On UNIX™, you must use raw disk devices to store data whenever performance is important. On Windows™, using NTFS files to store data is recommended for ease of administration.
Disk access on Windows™On Windows™, both raw disks and NTFS use kernel asynchronous I/O (KAIO). The Windows™ file system manager adds additional overhead to disk I/O, so using raw disks provides slight performance advantages. Because NTFS files are a more standard method of storing data, you must use NTFS files instead of raw disks. Consider using raw disks if your database server requires a large amount of disk access.

Disk access on Windows

On Windows™, both raw disks and NTFS use kernel asynchronous I/O (KAIO). The Windows file system manager adds additional overhead to disk I/O, so using raw disks provides slight performance advantages. Because NTFS files are a more standard method of storing data, you must use NTFS files instead of raw disks. Consider using raw disks if your database server requires a large amount of disk access.

Raw disk space on Windows

On Windows, raw disk space can be either a physical drive without a drive letter or a logical disk partition that has been assigned a drive letter using the Disk Administrator. The space can either be formatted or unformatted. If it contains data, the data is overwritten after the space has been allocated to the database server. For more information, see Allocating raw disk space on Windows.

NTFS files

You must use NTFS files, not FAT files, for disk space on Windows. For more information, see Allocating NTFS file space on Windows.