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Follow-up to MDEV-12289: Support innodb_undo_tablespaces=127
MySQL 5.7 reduced the maximum number of innodb_undo_tablespaces from 126 to 95 when it reserved 32 persistent rollback segments for the temporary undo logs. Since MDEV-12289 restored all 128 persistent rollback segments for persistent undo logs, the reasonable maximum value of innodb_undo_tablespaces is 127 (not 126 or 95). This is because out of the 128 rollback segments, the first one will always be created in the system tablespace and the remaining ones can be created in dedicated undo tablespaces.
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