@@ -182,73 +182,73 @@ INSERT INTO sys_dict_type VALUES (11, '内容状态', 'sys_content_status', '2', INSERT INTO sys_job VALUES (1, '接口测试', 'DEFAULT', 1, '0/5 * * * * ', 'http://localhost:8000', '', 1, 1, 1, 0, '2021
会阻塞update。 CREATE TABLE t ( a int NOT NULL PRIMARY KEY, b int DEFAULT NULL);insert into t values(7,7);commit; 执行相同的insert和update语句。 session1session2 SQL> insert into t values(8,8); 1 row created SQL> update t set b=0 where a=8...
Cannot grant, deny, or revoke permissions to sa, dbo, entity owner, information_schema, sys, or yourself. Cannot insert duplicate key row in object... Cannot insert the value NULL into column 'ID', table Cannot open backup device 'C:\TEMP\Demo.bak'. Operating system error 2(The system...
b int DEFAULT NULL ); insert into t values(7,7); commit; 1. 2. 3. 4. 5. 6. 复制 执行相同的insert和update语句。 Enjoy GreatSQL :)
So if you use a single transaction to create a table and INSERT INTO records, "sys.tables" system catalog will be blocked and other queries that need to access to the same catalog will be waiting until you free the lock. Conclusion: Try to avoid exclusive lo...
mysql> begin;Query OK, 0 rows affected (0.00 sec)mysql> insert into t values(8,8);Query OK, 1 row affected (0.01 sec) 更改数据,条件是a=8,将会被阻塞mysql> update t set b=0 where a=8;<<挂起,等待innodb_lock_wait_timeout超时 2. 分析原因 2.1. 检查事务锁信息 代码语言:javascript ...
阻塞事务执行的sql语句是insertintotvalues(8,8)。 说明: MySQL的隔离级别是通过索引上的锁实现并发事务控制的。在READ-COMMITTED隔离级别下,session1在执行insert语句时,在主键索引上获取了a=8的行记录独占锁,以禁止插入相同主键的数据;session2如果同时插入相同的主键数据被阻塞,容易理解(Oracle也同样阻塞)。出于同样...
TimeScaleValues View ViewCombination Views ViewsCombination ViewSingle ViewsSingle WeekDay WeekDays Window Windows Windows2 WorkWeek WorkWeekDay WorkWeekDays WorkWeeks Year Years Microsoft.Office.Project.PWA Microsoft.Office.Project.Server.Base Microsoft.Office.Project.Server.DataServices Microsoft.Office.Project...
b int DEFAULT NULL ); insert into t values(7,7); commit; 执行相同的insert和update语句。 Enjoy GreatSQL :) 关于GreatSQL GreatSQL是由万里数据库维护的MySQL分支,专注于提升MGR可靠性及性能,支持InnoDB并行查询特性,是适用于金融级应用的MySQL分支版本。
schedule regularVACUUMruns withcronor a different scheduler setautovacuum_freeze_max_agelow for that table, so that autovacuum processes it often enough Use case 3: hint bits on insert-only tables In PostgreSQL, the first query that reads a newly created row has to consult thecommit logto figu...