与Copy Table方式相比,Online Add Index采用的是Inplace方式,无需Copy Table,减少了空间开销;与此同时,Online Add Index只有在重放Row Log最后一个Block时锁表,减少了锁表的时间。 与Inplace方式相比,Online Add Index吸收了Inplace方式的优势,却减少了锁表的时间。 Inplace add Index
create unique index index_name on table_name('column_name'); 两者区别: (1)add index_name 支持一次多个索引创建alter table table_name add index_name using btree('column_name',...,'column_name'),add index_name using btree('column_name',...,'column_name') (2)add index_name 可以创建 ...
/* Index is not used in both parts of the WHERE clause */ ... WHERE index=1 OR A=10 /* No index spans all rows */ ... WHERE index_part1=1 OR index_part2=10 1. 2. 3. 4. 5. 6. 有时MySQL不使用索引,即使有可用的索引。一种情形是当优化器估计到使用索引将需要MySQL访问表中的...
I am having trouble while adding index on mysql table with ndbcluster storage engine below is the error . [mysqlcluster ver. 7.4 GA] mysql> alter table `sks_staff_office` add index `pid_index` (pid); ERROR 1296 (HY000): Got error 156 'Unknown error code' from NDBCLUSTER ...
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(col1, col2);" creates one index with two key parts. The key part is a reference to a column in the table, and for STRING/BINARY/TEXT/BLOB columns it is possible to only prefix a part of the column by specifying a prefix in parentheses after the column name; "CREATE INDEX idx1 ...
After review, it may be pushed to the relevant source trees for release in the next version. You can access the patch from: http://lists.mysql.com/commits/127171 3209 Jon Olav Hauglid 2010-12-17 Bug #42230 during add index, cannot do queries on storage engines that implement add_index...
*/ INSERTED_BEFORE_INSTANT_ADD_NEW_IMPLEMENTATION, /* Record was inserted after first instant add/drop done in the new implementation. */ INSERTED_AFTER_INSTANT_ADD_NEW_IMPLEMENTATION, /* Record belongs to table with no verison no instant */ // 如果index 上面没有做过instant add 或者 最新的...
} else if (index->table->has_instant_cols()) { // 到这里说明record 上面 没有row_version DD 和 instant add 标记, 但是这个index 上面有instant add 标记 // 说明这个record 是instant add 之前就插入的 rec_insert_state = INSERTED_BEFORE_INSTANT_ADD_OLD_IMPLEMENTATION; ...
Re: Add index for mysql table with ndbcluster storage engine 867 urgen sherpa June 10, 2016 05:40AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle an...