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Use the following parameters to control how space is allocated
in shared memory.
- Configuration
Parameter
- Description
- BUFFERS
- Specifies the number of shared-memory buffers available to
the database server. See Shared-Memory Buffer Pool.
- CKPTINTVL
- Specifies the maximum time interval allowed to elapse before
a checkpoint.
- DD_HASHMAX
- Specifies the maximum number of entries for each hash bucket
in the data-dictionary cache. For more information about setting DD_HASHMAX,
refer to your IBM Informix: Performance Guide.
- DD_HASHSIZE
- Specifies the number of hash buckets in the data-dictionary
cache. For more information about setting DD_HASHSIZE, refer to
your IBM Informix: Performance Guide.
- ISOLATION_LOCKS
- Specifies the maximum number of rows that can be locked on
a single scan when Cursor Stability isolation level is in effect.
For performance considerations when you use this parameter, refer
to your IBM Informix: Performance Guide.
- LOCKS
- Specifies the initial number of locks available to database
server user processes during transaction processing.
- PAGESIZE
- Specifies the database server page size.
- PC_POOLSIZE
- Specifies the number of SPL routines
that can be stored in the SPL routine cache.
- PC_HASHSIZE
- Specifies the number of hash buckets in the SPL routine cache.
- RESIDENT
- Specifies whether shared-memory residency is enforced.
- STACKSIZE
- Specifies the stack size for database server user threads.
For a discussion of the use of stacks, refer to Stacks.
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