mysql innodb的行鎖

隔離基本-- REPEATABLE-READ


root@sakila 10:14:32>show index from tab_no_index \G
*************************** 1. row ***************************
        Table: tab_no_index
   Non_unique: 1
     Key_name: id
 Seq_in_index: 1
  Column_name: id
    Collation: A
  Cardinality: 5
     Sub_part: NULL
       Packed: NULL
         Null: YES
   Index_type: BTREE
      Comment:
Index_comment:
1 row in set (0.00 sec)
同一個會話：
set autocommit=0;

--在索引上使用了鎖，具體使用哪個索引，需要看執行計劃
root@sakila 10:11:17>select * from tab_no_index where id=1 for update;
+------+------+
| id   | name |
+------+------+
|    1 | 1    |
+------+------+
1 row in set (0.00 sec)

--即使同一個會話，插入一條相同key的記錄也會鎖住
root@sakila 10:11:32>insert into tab_no_index values(1,'4');
ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
root@sakila 10:12:45>