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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
Shared memoryThese topics describe the content of database server shared memory, the factors that determine the sizes of shared-memory areas, and how data moves into and out of shared memory.
Buffer large-object dataSimple large objects (TEXT or BYTE data) can be stored in either dbspaces or blobspaces. Smart large objects (CLOB or BLOB data) are stored only in sbspaces.
Write simple large objectsThe database server writes simple large objects to disk pages in a dbspace in the same way that it writes any other data type.
Blobpages and shared memoryBlobspace blobpages store large amounts of data.

Blobpages and shared memory

Blobspace blobpages store large amounts of data.

The database server does not create or access blobpages by way of the shared-memory buffer pool, and it does not write blobspace blobpages to either the logical or physical logs.

If blobspace data passed through the shared-memory pool, it might dilute the effectiveness of the pool by driving out index pages and data pages. Instead, blobpage data is written directly to disk when it is created.

To reduce logical-log and physical-log traffic, the database server writes blobpages from magnetic media to dbspace backup tapes and logical-log backup tapes in a different way than it writes dbspace pages. For a description of how blobspaces are logged, see Log blobspaces and simple large objects.

Blobpages stored on optical media are not written to dbspace and logical-log backup tapes due to the high reliability of optical media.