重建聚集索引和重定义主键都是很少发生,所以官方文档没有详细涉及如何recovery的过程,可能需要联系mysql service。 6.fast index creation的限制 在创建、删除过程要考虑下面因素: -创建索引时,文件会被写到临时目录($tmpdir)。要确保临时目录空间足够大 -如果一条alter table对同一个表进行drop index,add index,无法...
In this blog, we provide a comprehensive guide with practical examples of MySQL indexes. Explore MySQL CREATE INDEX, functional indexes and more in MySQL 8.0.
重建聚集索引和重定义主键都是很少发生,所以官方文档没有详细涉及如何recovery的过程,可能需要联系mysql service。 6.fast index creation的限制 在创建、删除过程要考虑下面因素: -创建索引时,文件会被写到临时目录($tmpdir)。要确保临时目录空间足够大 -如果一条alter table对同一个表进行drop index,add index,无法...
Online creation of a multi-value index is not supported, which means the operation uses ALGORITHM=COPY. See Performance and Space Requirements. Character sets and collations other than the following two combinations of character set and collation are not supported for multi-valued indexes: The bi...
Fast Index Creation工作原理 创建索引:对于辅助索引的创建,InnoDB会对创建索引的表加一个S锁。创建的过程中,不需要重建表,因此速度较之前提高很多,并且数据库的可用性也得到了提高 删除索引:删除辅助索引操作就更简单了,InnoDB只需更新内部视图,并将辅助索引的空间标记为可用,同时删除MySQL数据库内部视图上对该表的索...
Online creation of a multi-value index is not supported, which means the operation uses ALGORITHM=COPY. See Performance and Space Requirements. Character sets and collations other than the following two combinations of character set and collation are not supported for multi-valued indexes: The bi...
Inplace Add Index处理流程 SQL alter table t1 add index idx_t1_b(b); 处理流程 sql_table.cc::mysql_alter_table(); //判断当前操作是否可以进行Inplace实现,不可进行Inplace Alter的包括: // 1. Auto Increment字段修改; // 2.列重命名; ...
After multi-valued index creation only rows from the beginning of the table are returned, the rows which posesses after some definite row are not returned. Observed on 8.0.27 and 8.0.28. Not observed on 8.0.23. How to repeat: -- set needed setting SET @@cte_max_recursion_depth := ...
[ERROR] 1071 - Specified key was too long; max key length is 3072 bytes This problem may occur in MySQL-8.0.20.5. Fault Analysis The InnoDB table engine has a length limit on index prefixes. By default, an index prefix can contain a maximum of 767 bytes, but ifinnodb_large_prefixis ...
(767 bytes). This occurred for tables with a row format of Redundant or Compact and the row format was not explicitly defined in the table creation. As of this release, a validation is performed and an error returned by any ALTER TABLE, INPLACE operation which will result in an invalid ...