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USER_MVREF_RUN_STATS contains records with NULL in both START_TIME and END_TIME (Doc ID 2641412.1)

Last updated on SEPTEMBER 30, 2020

Applies to:

Oracle Database - Standard Edition - Version 12.2.0.1 and later
Oracle Database - Enterprise Edition - Version 12.2.0.1 and later
Information in this document applies to any platform.

Symptoms

Mview-refresh-statistics gathering is a materialized view feature that is new in 12.2.  Currently the mechanism collects information for the purpose of diagnostics/reporting.  In future versions, these statistics may also be used to improve refresh performance.

If we create a materialized view on remote table via DBLINK then perform a refresh, a record in USER_MVREF_RUN_STATS is created with NULL in both START_TIME and END_TIME. Even worse theses records can not be purged by dbms_mview_stats.purge_refresh_stats. 

Materialized view was created using remote table via DBLINK instead of local table. 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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