mysql 5.6 和5.7的区别

发布网友发布时间：2022-04-08 09:05

共2个回答

懂视网时间：2022-04-08 13:26

, 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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热心网友时间：2022-04-08 10:34

要先给用户授权才可以连接。比如说先在cmd输入mysql-uroot-p进入mysql,然后用下面的命令是创建一个new用户，密码是123456，并允许用户从所有IP登录访问所有数据库。这样就可以从其他地方登录mysql了。grantallprivilegeson*.*tonew@'%'identifiedby"123456"withgrantoption;