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Hang may occur if IS JSON STRICT WITH UNIQUE KEYS is used (Doc ID 2771814.1)

Last updated on APRIL 26, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 19.3.0.0.0 and later
Information in this document applies to any platform.

Symptoms

'library cache lock' contention is observed and a DDL hangs if a check constraint is created with "is json strict with unique keys" option.

The following DDL hangs:

The hanganalyze shows that the blocker process is consuming high CPU and PGA memory.


alter table add check (jo_content is json) - this works
alter table add check (jo_content is json strict) - this works
alter table add check (jo_content is json strict with unique keys) - this hangs


Clean shutdown of the instance also hangs after that.

Cause

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In this Document
Symptoms
Cause
Solution
References


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