importmysql.connectorfrommysql.connectorimportErrordefset_read_only_mode(host_name,user_name,user_password):try:connection=mysql.connector.connect(host=host_name,user=user_name,password=user_password)cursor=connection.cursor()cursor.execute("SET GLOBAL read_only = OFF;")print("只读模式已取消")except...
select * from table where id = 1 lock in share mode; 解锁方式: commit/rollback 1. 2. 3. 4. 排它锁:写锁(X锁),排他锁不能与其他锁共存,如一个事务获取了一个数据行的排他锁,其他事务就不能再获取改行的锁,只有获取了此锁的事务才允许对数据进行读取和修改 加锁方式: 自动:delete/update/inse...
1 首先，点击菜单中的tools菜单 2 弹出了下拉菜单选中为options选项 3 点击genral选项 4 勾选上open data editor in the read-only mode选项 5 勾选上open data editor in the read-only mode选项之后，点击ok按钮
read_only/super_read_only 更像是对账号设置只读, 要连接数据库才能做的更新操作(含存储过程/函数,触发器,event)都不允许了. 已连接会话未提交的事务只能回滚. 是全局变量, 可动态修改. transaction_read_only/tx_read_only 是会话级别的参数, 会话可以自己修改自己的会话值. 所以对已连接的会话不生效 innodb_...
At runtime, the access mode can be set directly using theSETstatement to assign a value to thetransaction_read_onlysystem variable, or indirectly using theSET TRANSACTIONstatement. For example, use thisSETstatement to set the global value: ...
Bug #76415InnoDB: Failing assertion: srv_read_only_mode || trx->in_depth > 0 in SELECT Submitted:20 Mar 2015 22:11Modified:8 Apr 2015 18:38 Reporter:Roel Van de PaarEmail Updates: Status:ClosedImpact on me: None Category:MySQL Server: OptimizerSeverity:S6 (Debug Builds) ...
以前版本中,这些策略对应mode选项中的调度模式,其中read-write对应first-available,而read-only对应round-robin。它们保留了这些模式的先前行为。 添加了--ssl-key和--ssl-cert命令行选项,指定客户端证书和私钥以方便客户端身份验证。用于使用REQUIRE X509创建root帐户时。 添加了connect_timeout和read_timeout元数据...
To enable read-only mode for an entire MySQL instance, specify the following configuration options at server startup: --innodb-read-only=1 If the instance is on read-only media such as a DVD or CD, or the /var directory is not writeable by all: --pid-file=path_on_writeable_media ...
把备库B改成可读写状态,也就是把readonly设置为false 把业务请求切到备库B这个切换流程中是有不可用的时间的。在步骤2之后,主库A和备库B都处于readonly状态,也就是说这时系统处于不可写状态,直到步骤5完成后才能恢复。在这个不可用状态中,比较耗时的是步骤3,可能需要耗费好几秒的时间。也是为什么需要在步骤1先...
The transaction is started without theREAD ONLYoption, but no updates or statements that explicitly lock rows have been executed yet. Until updates or explicit locks are required, a transaction stays in read-only mode. Thus, for a read-intensive application such as a report generator, you can...