Slow Performance of a Query With Adaptive Plan with LOB Column from PLSQL Block
(Doc ID 2436574.1)
Last updated on APRIL 17, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 12.2.0.1 and later
Information in this document applies to any platform.
Symptoms
- Performance of query slow when running from PLSQL block with adaptive plan
- Query runs faster with NO_ADAPTIVE_PLAN hint although same plan is used
- There are LOB columns in SELECT clause
- PSTACKs show most of the time spent in 'qerlbFetch' and 'qerscFetch'
Changes
Issue reproduces when query is executed from PLSQL block and has LOB columns in SELECT clause.
Cause
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