Too Much Temp Space Used When Sorting A Small Lob Segment
(Doc ID 2364117.1)
Last updated on FEBRUARY 22, 2019
Applies to:Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Too much temp space used when running a simple SQL which sort a small LOB segment. The LOB segment is less than 1MB, but the sort takes more than 600MB temp space to store LOB_DATA; it is far more bigger than expected. (to sort 1MB LOB data, we need 600MB temp space, which is not reasonable):
A full testcase:
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