We've observed that the Jira database has shrunk about 50 % in size during the upgrade from Jira LTS 8.20.x to 9.4.x . The size can be checked through a dump or through a summarization sql.We couldn't observe any negative effect of this shrinkage but still it is suspicious. Has anyone else made this observation?
In our case the *EVENT* tables have accumulated 3 years of data. In Jira 9 a cleaning job emptied this tables to a reasonable size. This cleaning job should have worked before. Therefore it was an individual situation/observation.
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