The same feature can be implemented on MySQL 5.7 with the explicit creation of a virtual generated column and the index. For more detailed information, read the following page: https://dev.mysql.com/doc/refman/8.0/en/create-index.html#create-index-functional-key-parts The end of life (EOL...
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...
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...
MySQL Worklogs are design specifications for changes that may define past work, or be considered for future development. WL#11808: Make the SPATIAL keyword optional in index creation Affects: Server-8.0 — Status: Complete Description Requirements High Level Architecture Currently, users have to speci...
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...
Re: Index creation / Query Optimization : for a group by + SUM query on mysql Parttioned TablePosted by: Pandit P Date: November 07, 2018 06:25AM Thanks Mr.Peter Brawley. My current MySQL version is 5.7.21Navigate: Previous Message• Next Message Options: Reply• Quote ...
[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 ...
http://lists.mysql.com/commits/31057 is ok to push.[2 Aug 2007 19:12] Bugs System Pushed into 5.1.21-beta[2 Aug 2007 19:15] Bugs System Pushed into 5.0.48[3 Aug 2007 16:34] Paul DuBois Noted in 5.0.48, 5.1.21 changelogs. Index creation could fail due to truncation of ke...
inbug#71708and Laurynas Biveinis even proved a patch to avoid autoinc_mutex creation for dummy table. Sincebug#71708is closed and I encountered this problem, I decide to open a new bug report.How to repeat:Under heavy io-intensive workload using MySQL5.6.19 In my test, using sysbench,...
We are also having the same problem for 204m records. I have no clue on what is going on here. But the procedure described here helps speed up the index creation. Load the data with mysql with indices being turned off and then do myisamchk -r on that table ...