Bug 37294692
On Oracle AI Database 26ai, Release Update 23.6, failed vector index builds are cleaned up inline with subsequent CREATE INDEX.
Workaround
Run the alter system set _vector_index_cleanup_inline"=false; command to set the underscore parameter _vector_index_cleanup_inline to FALSE before starting a rolling upgrade of Oracle AI Database 26ai, Release Update 23.6 to Oracle AI Database 26ai, Release Update 23.7.
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