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SELECT from DBA_EXTENTS is Slow With OPTIMIZER_MODE=FIRST_ROWS (Doc ID 1471558.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.3 [Release 11.2]
Information in this document applies to any platform.

Symptoms

A tkprof on a produced 10046 trace file shows a full table scan on X$KTFBUE with many "db file sequential reads" as the main contributor to the query response time:

Cause

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