mysql 5.5 lock tables與隱式事務提交commit

發布時間：2020-08-13 14:47:08 來源：ITPUB博客閱讀：171 作者：wisdomone1 欄目：MySQL數據庫

結論:lock tables可以隱式提交其它會話的未提交事務

測試明細:
----session 1
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)

mysql> use test;
Database changed

mysql> create table t_commit(a int);
Query OK, 0 rows affected (0.04 sec)

---session 2
mysql> select count(*) from test.t_commit;
+----------+
| count(*) |
+----------+
| 0 |
+----------+
1 row in set (0.01 sec)

---session 1
mysql> insert into t_commit values(1);
Query OK, 1 row affected (0.01 sec)

---session 2
mysql> lock tables test.t_commit read local;
Query OK, 0 rows affected (0.00 sec)

mysql> select count(*) from test.t_commit;
+----------+
| count(*) |
+----------+
| 1 |
+----------+
1 row in set (0.00 sec)

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mysql 5.5 lock tables與隱式事務提交commit

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