SQL Server Agent是SQL Server中的一个Windows 服务,该服务用来运行制定的计划任务。计划任务其实是在SOL Server中定义的一个程序,该程序不需要干预即可自动开始执行。与tempdb和model 数据库一样,在使用SQL Server时也不要直接修改msdb数据库,SOL Server中的一些程序会自动使用该数据库。例如,当用户对数据进行存储...
inplace 算法的 DDL(简称 inplace DDL)还有更细致的分类,根据在 DDL 的过程中是否需要重新生成这张表,分为rebuild table 和 non-rebuild table instant:仅修改 data dictionary。目前仅支持在表最后增加新列(MySQL 8.0 支持) The table is rebuilt, which means that all of the data is reorganized substantiall...
I ran into the following code in an old exam of the C course I'm taking: I have no idea what the syntax "char q1:1" means, and I haven't been able to find it anywhere in "The C Programm... DI with constructor injection: Am I injecting too many services?
SQL> create table tb2 (id int primary key references tb1(id)); Table created. SQL> insert into tb1 values(1); 1 row created. SQL> commit; Commit complete. SQL> insert into tb2 values(1); 1 row created. SQL> commit; SQL> select dbms_metadata.get_ddl('TABLE','TB2','TEST') fro...
If SELF_ID is the same as the OWNER_ID, it means that you are connected to the DDL owner. QUERY: the statements of the queries. ADMIN SHOW DDL\G; *** 1. row *** _VER: 26 OWNER_ID: 2d1982af-fa63-43ad-a3d5-73710683cc63 OWNER_ADDRESS: 0.0.0.0:4000 RUNNING_JOBS: SELF_ID...
I ran into the following code in an old exam of the C course I'm taking: I have no idea what the syntax "char q1:1" means, and I haven't been able to find it anywhere in "The C Programm... DI with constructor injection: Am I injecting too many services?
{/* Matching new key not found. This means the key should be dropped. */ha_alter_info->add_dropped_key(table_key);//加入到drop key buffer}elseif(has_index_def_changed(ha_alter_info,table_key,new_key))//是否索引有所改变{/* Key was modified. */ha_alter_info->add_modified_key(...
/* Matching new key not found. This means the key should be dropped. */ ha_alter_info->add_dropped_key(table_key); //加入到drop key buffer } elseif(has_index_def_changed(ha_alter_info, table_key, new_key))//是否索引有所改变 ...
【测试类型:SQL功能】【测试版本:6.0.0】 wal_level为logic且并行回放场景下,创建发布后,执行ddl语句,会导致备机core 【操作系统和硬件信息】(查询命令: cat /etc/system-release, uname -a): openEuler release 20.03 (LTS) 【测试环境】(单机/1主x备x级联备): ...
一个天然的低代码、动态表单、动态数据源底层工具,运行时动态注册切换数据源,自动生成SQL(DDL/DML/DQL),读写元数据,对比数据库结构差异。No-Entity,适配100+关系/非关系数据库。常用于动态场景的底层支持,如:数据中台、低代码、可视化、工作流、自定义表单、异构数据库迁移同步、物联网车联网数据处理、数据清洗、运...