方法一简单的 --创建一个磁盘 exec master..xp_cmdshell 'net use z: \\10.10.10.102\d$ 123.com /user:10.10.10.102\administrator' --删除影射磁盘 exec master..xp_cmdshell 'net use z: /delete' --备份数据库 backup database TsingCloudDb to disk='z:
方法一简单的
--创建一个磁盘
exec master..xp_cmdshell
'net use z: \\10.10.10.102\d$ "123.com" /user:10.10.10.102\administrator'
--删除影射磁盘
exec master..xp_cmdshell 'net use z: /delete'
--备份数据库
backup database TsingCloudDb to disk='z:\TsingCloudDb.bak'
--自动执行
数据库--SQL server代理--作业 创建新作业---相关操作 时间关系不一一累述
--新建计划--把 exec master..xp_cmdshell 'net use z: /delete' 复制进去可以按照你的计划的时间执行了
------------------------------------------------------------------一下复制别人的 有空再修改-------------------------------------------------------------------------
--备份环境:把数据库服务器(192.168.1.8)的数据库(TEST)备份到(192.168.1.145)的C$下
--首先,做一个与客户端的映射
exec master..xp_cmdshell
'net use z: \\192.168.1.145\c$ "密码" /user:192.168.1.145\administrator'
/*--说明:
z: 是映射网络路径对应本机的盘符,与下面的备份对应
\\192.168.1.145\c$ 是要映射的网络路径
192.168.1.145\administrator
192.168.1.145是远程的计算机名,administrator是登陆的用户名
密码 上面指定的administrator用户的密码
--*/
--其次,进行数据库备份
backup database TEST to disk='z:\Test.bak'
--最后.备份完成后删除映射
exec master..xp_cmdshell 'net use z: /delete'
--以下代码放在作业里做调度,自动备份、自动删除4天前备份
--创建映射
exec master..xp_cmdshell 'net use w: \DatabaseBackup$ "password"/user:Roy',NO_OUTPUT
go
-----用游标:
declare @s nvarchar(200),@del nvarchar(200)
select @s='',@del=''
declare datebak cursor for
select
[bak]='backup database '+quotename(Name)+' to disk =''w:'+Name+'_'+convert(varchar(8),getdate(),112)+'.bak'' with init',
[del]='exec master..xp_cmdshell '' del w:'+Name+'_'+convert(varchar(8),getdate()-4,112)+'.bak'', no_output'
from master..sysdatabases where dbid>4 --不备份系统数据库
open datebak
fetch next from datebak into @s,@del
while @@fetch_status=0
begin
exec (@del)
exec(@s)
fetch next from datebak into @s,@del
end
close datebak
deallocate datebak
go
--删除映射
exec master..xp_cmdshell 'net use w: /delete'
go
--用JOB.
--SQL SERVER2008为例
数据库服务器—>SQL SERVER代理—>作业—>右键 选—>新建
常规选项页—>输入作业名称—>选中所有者。
步骤选项页—>新建—>输入步骤名—>类型 TSQL脚本—>选择需要执行的数据库—>在命令框里输入你的SQL 脚本:
如:update tb set 状态= ... where 日期...........
你可以点左下角的【分析】按钮,分析一下语法,分析无误,按确定。
调度选项页—>新建调度—>输入调度名称—>调度类型 你可以选择也可以点右下角的【更改】按钮进行更改,确定。
任务栏 SQL SERVER服务器的小图标 双击 服务 选中 SQL SERVER AGENT,点【开始/继续】,选中当启动OS时,自动启动服务,就可以了。
到你定的那个时间点,SQL SERVER会自动去执行你的脚本的。
如果需要生成脚本的话,企业管理器—>数据库服务器—>管理目录—>SQL SERVER代理—>作业—>右键你刚完成的作业—>所有任务
—>生成SQL脚本,即可生成你需要的脚本

ACID attributes include atomicity, consistency, isolation and durability, and are the cornerstone of database design. 1. Atomicity ensures that the transaction is either completely successful or completely failed. 2. Consistency ensures that the database remains consistent before and after a transaction. 3. Isolation ensures that transactions do not interfere with each other. 4. Persistence ensures that data is permanently saved after transaction submission.

MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.

MySQL is an efficient relational database management system suitable for storing and managing data. Its advantages include high-performance queries, flexible transaction processing and rich data types. In practical applications, MySQL is often used in e-commerce platforms, social networks and content management systems, but attention should be paid to performance optimization, data security and scalability.

The relationship between SQL and MySQL is the relationship between standard languages and specific implementations. 1.SQL is a standard language used to manage and operate relational databases, allowing data addition, deletion, modification and query. 2.MySQL is a specific database management system that uses SQL as its operating language and provides efficient data storage and management.

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB


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