IBM Data and AI Ideas Portal for Clients

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255 rows/page limit should be addressed

Informix has a rows/page limit of 255 rows/page.

Perhaps this was not a problem originally but over time we have seen new features:

  • larger page sizes (up to 16 kB against 2 kB or 4 kB previously, dependent on operating system).

  • compression option.

This is coupled with the problem of the system limit of 16,777,215 pages per table or table partition which is documented in the following RFEs:

To increase the maximum size of a table or also to increase system efficiency large page sizes can be used, however for many narrow tables the benefit is taken away by being unable to fill a page.

The Informix compression option is superb and achieves amazing size reductions but the benefits are often only fully realised for indices where the rows per page limit does not exist. For tables small page sizes must be used for the majority of tables on our system to avoid hitting this limit.

Overall I think the negative consequences of this are:

  • DBA time in working out, dealing with the problem, goes against the idea that Informix has a low support requirement.

  • Unable to benefit from the efficiencies of larger page sizes without wasted space.

  • Wasted space, inefficient use of storage.

  • Guest
  • Jun 2 2020
  • Future consideration
Who would benefit from this IDEA? This would save DBA time, improve efficiency and reduce the need to code tools to work around the issue.
How should it work?

Ideally the limit should be removed, maybe along with the 16,777,215 pages per table or table partition limit.

If not, the following would help:

  • InformixHQ report on tables where the average row size is not big enough to fill a page.

  • Advisor for recommended page sizes for tables both with and without compression.

Idea Priority Medium
Priority Justification Would benefit all users, not as high a priority as the pages per partition limitation.
Client Name Bonne Terre

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