ERROR 1846 (0A000):ALGORITHM=INPLACE is not supported. Reason: Cannot change column type INPLACE. Try ALGORITHM=COPY. 可能原因 使用INPLACE方式扩展VARCHAR字段长度时,不支持将小于256字节的字段扩展为等于或大于256字节的字段。 支持扩展的字段长度
. My workaround is to simply fill in some default rubbish and capture the change, then paste it in Query Browser and replace the rubbish with NULL, but it makes changing columns aftwerwards quite annoying.How to repeat:Add a datetime column, forget the default value, try to null it ...
Bug #2094 ALTER TABLE allows change of the column containing NULL's to NOT NULL Submitted: 11 Dec 2003 5:03Modified: 27 Sep 2008 9:37 Reporter: SINISA MILIVOJEVIC Email Updates: Status: Can't repeat Impact on me: None Category: MySQL Server: InnoDB storage engineSeverity: S3 (Non-...
The IP address configured with this option, if any, can be seen in the Source_Bind column of the output from SHOW REPLICA STATUS. In the source metadata repository table mysql.slave_master_info, the value can be seen as the Source_bind column. The ability to bind a replica to a specifi...
但给字段重命名,千万不要drop-add,整列数据会丢失,使用change col1 col1_new type constraint(保持类型和约束一致,否则相当于修改 column type,不能online) 子句如果是add column并且定义了not null,那么必须指定default值,否则会失败。 如果要删除外键(名 fk_foo),使用工具的时候外键名要加下划线,比如--alter ...
Do you want tocontinue? [Y/n] y [使用] 1.查看MySQL性能摘要 pt-mysql-summary --host localhost --user root --ask-pass 2.修改表结构 pt-online-schema-change --alter"add column t8 int(11) not null default 0"D=test,t=log,h=192.168.16.48,P=3306,u=root,p=123456--print --execute ...
The value is NULL when any one of the following conditions is true: Column change tracking is not enabled. The operation is an insert or delete operation. All nonprimary key columns were updated in one operation. This binary value should not be interpreted directly. Instead, to interpret it,...
Add Name column to tabular data to make consistent with other parts of spec. Correct description of Encoding Record. cvt.htm Indicate that length must be integral value of FWORD units. dsig.htm Provide information for ulVersion to be 0x00000001. Update to show usFlag bits that are assign...
`address`varchar(255)DEFAULTNULL, PRIMARYKEY(`id`) )ENGINE=InnoDB; 现在,我们需要添加一个新的字段email到employees表,并将其设置为唯一约束。 4.3 使用 pt-online-schema-change 添加新字段 运行以下命令以在线方式添加新字段: pt-online-schema-change--alter"ADD COLUMN email VARCHAR(255) UNIQUE"D=my_da...
@index_name = null, --没有主键时可以指定一个唯一键 @captured_column_list = null, --默认跟踪所有的列,不过也可以指定要跟踪的列表:N'[vid],[v]' @filegroup_name = N'PRIMARY', --指定CDC数据存储在哪里,通过指定不同于源表的文件组,可提高效率 ...