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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
Manage shared memory
Set operating-system shared-memory configuration parametersSeveral operating-system configuration parameters can affect the use of shared memory by the database server.
Maximum shared-memory segment sizeWhen the database server creates the required shared-memory segments, it attempts to acquire as large an operating-system segment as possible.
Maximum number of shared-memory identifiers (UNIX™)The operating system identifies each shared-memory segment with a shared-memory identifier. Shared-memory identifiers affect the database server operation when a virtual processor attempts to attach to shared memory.

Maximum number of shared-memory identifiers (UNIX)

The operating system identifies each shared-memory segment with a shared-memory identifier. Shared-memory identifiers affect the database server operation when a virtual processor attempts to attach to shared memory.

For most operating systems, virtual processors receive identifiers on a first-come, first-served basis, up to the limit that is defined for the operating system as a whole. For more information about shared-memory identifiers, see How virtual processors attach to shared memory.

You might be able to calculate the maximum amount of shared memory that the operating system can allocate by multiplying the number of shared-memory identifiers by the maximum shared-memory segment size.

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