数据字典(Data Dictionary)中存储了诸多数据库的元数据信息如图1所示,包括基本Database, table, index, column, function, trigger, procedure,privilege等;以及与存储引擎相关的元数据,如InnoDB的tablespace, table_id, index_id等。MySQL-8.0在数据字典上进行了诸多优化,本文将对其进行逐一介绍。 图1 2. MySQL-8.0...
Additionally, you can use the Migration Wizard to perform MySQL to MySQL database migrations, which can be used for tasks such as copying a database across servers or migrating data across different versions of MySQL. We have already described in a previous posthow to use t...
ALTER TABLE users RENAME COLUMN username TO user_name; 注意:某些MySQL版本可能不支持直接重命名列,这时需要使用临时列的方法来实现。 修改字段类型 虽然不常见,但如果我们需要将VARCHAR类型的字段更改为其他类型(例如TEXT),可以使用以下命令: 代码语言:txt ...
ALTER TABLE [catalog.[database.]]test1 RENAME to [database.]test2;不能将Catalog名称放在重命名的...
The database administrator can provide a copy of the public key file. A client user who can connect to the server some other way can use aSHOW STATUS LIKE 'Caching_sha2_password_rsa_public_key'statement and save the returned key value in a file. ...
First step in setting upmysqld_multiis the creation of two separate[mysqld]groups in the existingmy.cnffile. Default location ofmy.cnffile on the Ubuntu is/etc/mysql/. So, openmy.cnffile with your favorite text editor, and rename existing[mysqld]group to[mysqld1]. This renamed group ...
TheCREATEUSERprivilege enablesuseoftheALTERUSER,CREATEUSER,DROPUSER, RENAMEUSER,andREVOKEALLPRIVILEGESstatements. TheCREATEVIEWprivilege enablesuseoftheCREATEVIEWstatement. TheDELETEprivilege enables rowstobe deletedfromtablesinadatabase. TheDROPprivilege enables youtodrop(remove) existing databases, tables,andvi...
-通过客户端sql修改MariaDB [mysql]>UPDATEuserSETPassword=password('123456')WHEREUser='root';--此时可在binglog中可以看到明文的密码[root@rudy_013306]# mysqlbinlog binlog.000006--start-position=4224 >/tmp/test.sql[root@rudy_013306]# cat /tmp/test.sqlSET@@session.collation_database=DEFAULT/*!
After you have tested the upgrade on the green environment, you can perform a switchover to promote the green environment. You can specify a switchover timeout between 30–3,600 seconds (1 hour). After the switchover is successful, Amazon RDS renames the endpoints in the green ...
When upgrade is completed, please execute 'RENAME TABLE part_table_name TO new_table_name; RENAME TABLE new_table_name TO part_table_name;' for each of the partitioned tables. Please see the documentation for further information. If you encounter this error when upgrading to MySQL 8.0.17,...