Last Refresh Time Keeps Gaining More Than Wall Clock Time
(Doc ID 1485730.1)
Last updated on FEBRUARY 22, 2019
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Information in this document applies to any platform.
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- Several master sites all have the correct system day/time, but the last refresh dates of some mviews are days in the future. The difference between real time and the last refresh time continues to grow.
- Dropping and recreating the affected mviews sets the time back to normal; then the last-refresh times start growing faster than real clock time again.
- The mviews appear to have the correct data. However, these databases need to be migrated/upgraded and there is concern about whether or not this will cause a problem with the fast refresh after migration.
- On all materialized view sites for the affected mviews, sys.sum$.lastrefreshdate and sys.snap_reftime$.snaptime are different. The value for snap_reftime$.snaptime is almost a few weeks in the future.
- Dictionary views pertaining to these two base tables also report different dates. For example, DBA_SNAPSHOTS and DBA_MVIEWS have different dates for last refresh. Similarly DBA_MVIEWS and DBA_MVIEW_REFRESH_TIMES are showning different dates, as they pull from sum$ and snap_reftime$, respectively.
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