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Informix Error -21511: Cannot request more than 1 page for online index build.

Cause and resolution

Cannot request more than 1 page for online index build.

The online index build has requested more than 1 page during parallel build.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-21511 is an internal error — per the official guidance, an online index build requested more than one page during a parallel build.

  1. A parallel online index build requesting more than one page, per the official guidance — no further user-actionable detail is given.
Solutions / Resolution
  1. If this internal error recurs, note all circumstances and contact IBM Informix Technical Support, per the official guidance's implication.
Examples
N/A

No specific triggering statement is documented — this is reported as an internal error.

Diagnostic Checks
  1. Record the full sequence of events, and escalate to IBM Informix Technical Support if the error recurs.
Related Errors / Related Topics
  • -21521 — "More than 1 online index operation on the same table." A related online- index-build restriction, on concurrent operations rather than page-request count.
  • -21522 — "No online index build possible." A related online-index-build restriction, on the build being unsupported for the scenario at all.

An online index build's parallel-build step requested more than one page — an internal error; contact IBM Informix Technical Support if it recurs.