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Informix Error -645

-645 Cannot reserve volume.

An attempt to reserve an optical volume with the RESERVE statement has failed. See the error from the optical subsystem (an error in the -7000 to -7199 range) for more information.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-645 fires when a RESERVE statement's attempt to reserve an optical volume fails — per the official guidance, the specific reason is carried by an accompanying error from the optical subsystem itself, in the -7000 to -7199 range, a distinct numeric range from the ordinary SQL error codes covered in this set.

  1. An underlying optical-subsystem-level failure (media unavailable, jukebox/library hardware issue, the specific volume already reserved elsewhere), per the official guidance's pointer to the accompanying -7000..-7199 error.
  2. A valid RESERVE statement syntactically (having already passed the -641/-642/-643 checks on family/volume argument types and validity) failing at the physical/subsystem level instead.
Solutions / Resolution
  1. Check the accompanying optical-subsystem error (in the -7000 to -7199 range), per the official guidance — that error carries the specific reason the reservation failed.
  2. Confirm the requested family/volume identify an actual, available optical volume, since a valid-looking RESERVE statement can still fail if the physical volume itself isn't available.
  3. Engage whoever administers the Optical Subsystem hardware (jukebox/library) if the accompanying -7000..-7199 error points to a hardware/media-availability condition.
Examples
Checking the accompanying optical-subsystem error
-- A -645 failure is accompanied by a second error in the -7000..-7199
-- range -- that error identifies the specific subsystem-level reason
-- (this errata set doesn't currently cover that separate numeric range).
Diagnostic Checks
  1. Identify and look up the accompanying -7000..-7199 optical-subsystem error code — that's the documented path to the specific cause, per the official guidance.
Related Errors / Related Topics
  • -641 — "Cannot reserve/release family on non-optical media." A related, earlier-stage RESERVE/RELEASE validation error.
  • -642 — "Family name must be a character string." A related earlier-stage validation error.
  • -643 — "Volume must be a number." A related earlier-stage validation error.
  • -646 — "Cannot release volume." The mirror-image failure, on the RELEASE side.

The specific cause lives in a separate accompanying error (-7000..-7199), not in -645 itself — look that one up for the actual reason.