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Marko Mäkelä authored
Occasionally, the test innodb.alter_copy would fail in MariaDB 10.6.1, reporting DB_MISSING_HISTORY during CHECK TABLE. It started to occur during the development of MDEV-25180, which introduced purge_sys.stop_SYS(). If we delay purge more during DDL operations, then the test would almost always fail. The reason is that during startup we will restore a purge view, and CHECK TABLE would still use REPEATABLE READ even though innodb_read_only is set and other isolation levels than READ UNCOMMITTED are not guaranteed to work. ha_innobase::check(): Use READ UNCOMMITTED isolation level if innodb_read_only is set or innodb_force_recovery exceeds 3. dict_set_corrupted(): Do not update the persistent data dictionary if innodb_force_recovery exceeds 3.
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