Additionally, if binary logging is enabled, MySQL Server may flush binary logs on every transaction commit depending on configuration of sync_binlog option. SYMPTOMS Following symptoms may be observed: COMMIT query appears in slow log PROCESSLIST shows some connections hanging in query_end state for ...
Additionally, if binary logging is enabled, MySQL Server may flush binary logs on every transaction commit depending on configuration of sync_binlog option. SYMPTOMS Following symptoms may be observed: COMMIT query appears inslow log PROCESSLISTshows some connections hanging in query_end state for sev...
> queries by serializing the query. > > If you have a logical block you wish to be atomic > (therefore to use transaction), use Stored > Procedures. > > Returning values from Stored Procedures is not > that difficult is you return only single value. ...
$> mysql test mysql> CREATE TABLE customer (a INT, b CHAR (20), INDEX (a)); Query OK, 0 rows affected (0.00 sec) mysql> -- Do a transaction with autocommit turned on. mysql> START TRANSACTION; Query OK, 0 rows affected (0.00 sec) mysql> INSERT INTO customer VALUES (10, 'Heikki...
5 rows in set (0.02 sec) 通过插入数据(insert into)来查看begin和rollback的用法: mysql> begin -> ; Query OK, 0 rows affected (0.00 sec) mysql> insert into star (name,time,scores,country) values ("LG",now(),78,"中国"); Query OK, 1 row affected, 1 warning (0.02 sec) ...
(0.00sec)mysql>begin;#开启一个事务QueryOK,0rows affected(0.00sec)mysql>insert into a values(5,'小测','测试事务');#插入一条数据QueryOK,1row affected(0.00sec)mysql>select*from a;#查看表a数据+---+---+---+|id|name|a_tx|+---+---+---+|1|菜菜最厉害|NULL||2|小明|我爱中国||...
比较坑人的是,这个选项在5.1无法在线修改,需要重启mysqld才行。 手册上关于这个选项的解释如下: Include slow administrative statements in the statements written to the slow query log. Administrative statements include ALTER TABLE, ANALYZE TABLE, CHECK TABLE, CREATE INDEX, DROP INDEX, OPTIMIZE TABLE, and ...
MySQL支持两种事务隔离级别: 读未提交(Read Uncommitted) 读已提交(Read Committed) 可重复读(Repeatable Read)(MySQL默认隔离级别) 串行化(Serializable) 应用场景 事务常用于以下场景: 银行转账:确保从一个账户扣除金额和向另一个账户增加金额的操作是原子的。
(21.49 sec) mysql> begin; Query OK, 0 rows affected (0.00 sec) mysql> delete from a where val=-1; Query OK, 0 rows affected (21 min 51.39 sec) mysql> commit; Query OK, 0 rows affected (0.34 sec) In the slow log: # Time: 2024-11-28T02:10:51.823738Z # User@Host: root[...
136 Query Insert into tblPaymentDetails Set paymentDetailsID=5475, outletID = 3,receiptID = 5186, paymentTypeID= 1, amount = 700 136 Query COMMIT 110320 17:17:31 136 Quit Subject Written By Posted Commit but no data in the database ...