SQL Server 2000新建同名数据库,停数据库,删除文件,复制文件进来。 启动数据库,此时数据库置疑,打开查询分析器exec sp_conf
SQL Server 2000新建同名数据库,,停数据库,删除文件,复制文件进来。 启动数据库,此时数据库置疑,打开查询分析器
exec sp_configure 'allow updates',1 RECONFIGURE WITH OVERRIDE /* 打开修改系统表的开关 */
update sysdatabases set status=32768 where /* 设置数据库状态 */
DBCC REBUILD_LOG ('BecomCQUser','D:/ClearQuest/BecomCQUser_Log.LDF') /* 重建LDF文件 */
update sysdatabases set status=0 where /* 重置数据库状态 */
restore database BecomCQUser WITH RECOVERY /* 恢复数据库 */
update sysdatabases set status =16 where name = 'BecomCQUser'
exec sp_configure 'allow updates',0 RECONFIGURE WITH OVERRIDE
如果有登陆用户在登录里没有,而在该数据库里有,那么会既建不了登录,又删除不了登录用户,这时候可以改变库里对象的所有者,然后删掉用户,再新建登录即可
选中数据库,执行以下语句,把所有对象的所有者改成了dbo,之后就可以删除登录用户了
declare tb cursor local for
select 'sp_changeobjectowner ''['+replace(user_name(uid),']',']]')+'].['
+replace(name,']',']]')+']'',''dbo'''
from sysobjects
where xtype in('U','V','P','TR','FN','IF','TF') and status>=0
open tb
declare @s nvarchar(4000)
fetch tb into @s
while @@fetch_status=0
begin
exec(@s)
fetch tb into @s
end
close tb
deallocate tb
go

Mastering the method of adding MySQL users is crucial for database administrators and developers because it ensures the security and access control of the database. 1) Create a new user using the CREATEUSER command, 2) Assign permissions through the GRANT command, 3) Use FLUSHPRIVILEGES to ensure permissions take effect, 4) Regularly audit and clean user accounts to maintain performance and security.

ChooseCHARforfixed-lengthdata,VARCHARforvariable-lengthdata,andTEXTforlargetextfields.1)CHARisefficientforconsistent-lengthdatalikecodes.2)VARCHARsuitsvariable-lengthdatalikenames,balancingflexibilityandperformance.3)TEXTisidealforlargetextslikeartic

Best practices for handling string data types and indexes in MySQL include: 1) Selecting the appropriate string type, such as CHAR for fixed length, VARCHAR for variable length, and TEXT for large text; 2) Be cautious in indexing, avoid over-indexing, and create indexes for common queries; 3) Use prefix indexes and full-text indexes to optimize long string searches; 4) Regularly monitor and optimize indexes to keep indexes small and efficient. Through these methods, we can balance read and write performance and improve database efficiency.

ToaddauserremotelytoMySQL,followthesesteps:1)ConnecttoMySQLasroot,2)Createanewuserwithremoteaccess,3)Grantnecessaryprivileges,and4)Flushprivileges.BecautiousofsecurityrisksbylimitingprivilegesandaccesstospecificIPs,ensuringstrongpasswords,andmonitori

TostorestringsefficientlyinMySQL,choosetherightdatatypebasedonyourneeds:1)UseCHARforfixed-lengthstringslikecountrycodes.2)UseVARCHARforvariable-lengthstringslikenames.3)UseTEXTforlong-formtextcontent.4)UseBLOBforbinarydatalikeimages.Considerstorageov

When selecting MySQL's BLOB and TEXT data types, BLOB is suitable for storing binary data, and TEXT is suitable for storing text data. 1) BLOB is suitable for binary data such as pictures and audio, 2) TEXT is suitable for text data such as articles and comments. When choosing, data properties and performance optimization must be considered.

No,youshouldnotusetherootuserinMySQLforyourproduct.Instead,createspecificuserswithlimitedprivilegestoenhancesecurityandperformance:1)Createanewuserwithastrongpassword,2)Grantonlynecessarypermissionstothisuser,3)Regularlyreviewandupdateuserpermissions

MySQLstringdatatypesshouldbechosenbasedondatacharacteristicsandusecases:1)UseCHARforfixed-lengthstringslikecountrycodes.2)UseVARCHARforvariable-lengthstringslikenames.3)UseBINARYorVARBINARYforbinarydatalikecryptographickeys.4)UseBLOBorTEXTforlargeuns


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