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
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.
Resident portion of shared memoryThe operating system, as it switches between the processes that run on the system, normally swaps the contents of portions of memory to disk. When a portion of memory is designated as resident, however, it is not swapped to disk. Keeping frequently accessed data resident in memory improves performance because it reduces the number of disk I/O operations that would otherwise be required to access that data.
Shared-memory headerThe shared-memory header contains a description of all other structures in shared memory, including internal tables and the buffer pool, and pointers to the locations of these structures.

Shared-memory header

The shared-memory header contains a description of all other structures in shared memory, including internal tables and the buffer pool, and pointers to the locations of these structures.

When a virtual processor first attaches to shared memory, it reads address information in the shared-memory header for directions to all other structures.

The size of the shared-memory header is about 200 KB, but the size varies depending on the computer platform. You cannot tune the size of the header.

Have feedback?
Google Analytics is used to store comments and ratings. To provide a comment or rating for a topic, click Accept All Cookies or Allow All in Cookie Preferences in the footer of this page.