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

Last updated on JULY 20, 2024

Applies to:

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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