主从同步。binlog记录的是行变化，记录格式也有3种，statement，row，mixed，这里就不细讲了。在了解了redo log 和binlog的含义和各自的作用后，我们先来看看它们在一次sql更新中是如何运作的。sql 更新过程详解 来看下在一次事务过程中，它们的工作机制。假设我们在进行修改操作，那么可以用下面的流程图
InInnoDB, all user activity occurs inside a transaction. Ifautocommitmode is enabled, each SQL statement forms a single transaction on its own. By default, MySQL starts the session for each new connection withautocommitenabled, so MySQL does a commit after each SQL statement if that statement d...
4. Using the COMMIT Statement COMMIT is an SQL statement that makes changes permanent and ends a user-managed transaction. Furthermore, when a change is made permanent, it becomes visible in all user sessions. COMMIT’s syntax with optional sub-clauses in square brackets is: COMMIT [WORK] [...
File "/opt/homebrew/lib/python3.9/site-packages/mysql/connector/connection.py", line 1455, in handle_unread_result raise errors.InternalError("Unread result found") mysql.connector.errors.InternalError: Unread result found ``` commit a select statement always return a "Unread result found" error....
5.4.7 mysql_commit() mysql_commit(MYSQL*mysql) Commits the current transaction. The action of this function is subject to the value of thecompletion_typesystem variable. In particular, if the value ofcompletion_typeisRELEASE(or 2), the server performs a release after terminating a transaction ...
statement格式的binlog，最后会有COMMIT row格式的binlog，最后会有一个XID event MySQL 5.6.2以后还...
FALSE - the current SQL statement ended */ { ... trx->mysql_log_file_name = mysql_bin_log.get_log_fname(); trx->mysql_log_offset = (ib_longlong)mysql_bin_log.get_log_file()->pos_in_file; ... } 函数innobase_commit提交事务,先得到当前的binlog的位置,然后再写入事务系统PAGE(trx_...
Type'help;'or'\h'forhelp. Type'\c'toclear thecurrentinput statement. MariaDB [(none)]>showdatabases;+---+|Database|+---+|information_schema||mysql||performance_schema||test|+---+4rowsinset(0.00sec) MariaDB [(none)]>createdatabase bp #我自己创建一个数据库用来做这个实验->;...
url = jdbc:mysql://selectdb-cn-***.selectdbfe.rds.aliyuncs.com:9030/db?useServerPrepStmts=true&sessionVariables=group_commit=async_mode 通过执行SQL设置 try(Statementstatement=conn.createStatement()) { statement.execute("SET group_commit = async_mode;"); } 使用...
If the value of this variable is greater than 0, the MySQL server synchronizes its binary log to disk (using fdatasync()) after every sync_binlog writes to the binary log. There is one write to the binary log per statement if autocommit is enabled, and one write per transaction otherwis...