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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