InnoDB事务锁之行锁-delete流程update阶段加锁
1、介绍
delete流程分search和update两个阶段。在search阶段对聚集索引记录加锁，参考上一篇文章。在update阶段会对聚集索引记录打上delete标签，然后search二级索引记录，对二级索引记录加隐式锁，即不加锁，最后将二级索引记录打上delete标签点击(此处)折叠或打开
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mysql_delete::
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//rr_quick->...->row_search_for_mysql
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while (!(error=info.read_record(&info)) && !thd->killed &&! thd->is_error()){
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...
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//...->row_update_for_mysql
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error= table->file->ha_delete_row(table->record[0]);
- ...
- }