mysql5.6和mysql5.7分配undo回滚段的区别

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1、mysql5.7中分为2类：临时表空间回滚段和普通回滚段。

2、mysql5.6中没有区分。

As of MySQL 5.7.2, 32 undo logs are reserved for use by temporary tables and are hosted in the temporary table tablespace (ibtmp1). To allocate additional undo logs for data-modifying transactions that generate undo records,innodb_undo_logs must be set to a value greater than 32 if undo logs are stored in the system tablespace only. If you have configured separate undo tablespaces, innodb_undo_logs must be set to a value greater than 33 to allocate additional undo logs for data-modifying transactions. Each undo log can host up to a maximum of 1024 transactions.

如果undo log存储在系统表空间，innodb_undo_logs值必须大于32

否则独立存储的话必须大于3。

参考：

http://www.tuicool.com/articles/IzQNRrz

http://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html#sysvar_innodb_undo_logs

http://dev.mysql.com/doc/refman/5.6/en/innodb-parameters.html#sysvar_innodb_undo_logs

http://bbs.aliyun.com/read/244045.html?spm=5176.7189909.0.0.AB00as

mysql5.6和mysql5.7分配undo回滚段的区别

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原文地址：http://blog.csdn.net/yanzongshuai/article/details/48141319