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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 Informix® database servers.
High-Performance Loader User's GuideThe describes how to use the HCL Informix® to load and unload large quantities of data efficiently to or from Informix® databases.
Manage the High-Performance Loader
HPL performanceYou can improve the HPL performance by preparing an environment that is optimized for the particular load or unload job that you are performing.
Settings for a no-conversion load or unload jobA no-conversion load or unload is not highly CPU intensive because no conversion is involved. In this case, the load or unload is expected to be limited by the speed of the tape devices. No-conversion loads and unloads are always completed in express mode.

Settings for a no-conversion load or unload job

A no-conversion load or unload is not highly CPU intensive because no conversion is involved. In this case, the load or unload is expected to be limited by the speed of the tape devices. No-conversion loads and unloads are always completed in express mode.

The following table lists sample values of configuration parameters for a raw load.


Configuration parameter	Suggested value	Comment
CONVERTVPS	4	This process is not CPU intensive.
CONVERTTHREADS	1	This process is not CPU intensive.
STRMBUFFSIZE	128	Choose some multiple of the AIOBUFSIZE, up to about 8*AIOBUFSIZE.
STRMBUFFERS	5	Should be CONVERTTHREADS + 4.
AIOBUFSIZE	32	Choose a buffer size to match the best block size for the tape drive. Large buffers increase performance if sufficient memory is available.
AIOBUFFERS	5	CONVERTTHREADS + 4 or 2 * CONVERTTHREADS, whichever is larger

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