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How frequent MySQL Security patches are released by Oracle . Is there is any trend like quarterly or half yearly ?
With the MySQL 8.0 series, there are releases every three or so months that do include security updates. That is unless there is something urgent that needs to be updated. Watch the release notes for updates https://dev.mysql.com/doc/relnotes/mysql/8.0/en/
MySQL 8.0.16 was release on April 25th