Solutions that cannot be restored after a SQL Server database backup

Sometimes in order to consider data security, we will back up the database, SQL Server backup format is generally bak end, but the cover is easy to problem, here is a simple introduction, the need for friends can be referred to sometimes full backup, when the restoration of the time that the database file does not allow restore, the solution:


can copy the database files directly, Xxx.mdf and xxx.ldf (you need to stop the SQL Server service in the actual replication process)





can be done with sp_attach_db stored procedures.





Sample


The following example attaches two files in pubs to the current server.





EXEC sp_attach_db @dbname = N ' pubs ',


@filename1 = N ' C:Program filesmicrosoft SQL servermssqldatapubs.mdf ',


@filename2 = N ' C:Program filesmicrosoft SQL servermssqldatapubs_log.ldf '








n denotes the meaning of Unicode, as in the case of a type with varchar and nvarchar, one Unicode character is two bytes. Using n ' is the primary way to force the system to interpret each character in a double-byte system environment with a Unicode standard. Otherwise, if your database. mdf file is the Chinese name without adding n ', the database load name may become garbled, because the system in a single byte processing characters caused!








............................................................








If you are sure that SQL Server cannot start, follow these steps:


1. Reload SQL SERVER (note that you want to keep the database files of the original database, log files are not available)


2. Add the database to the server using sp_attach_db in SQL Analysis





sp_attach_db Usage:


sp_attach_db


attach the database to the server.





Syntax


sp_attach_db [@dbname =] ' dbname '


, [@filename1 =] ' Filename_n ' [,... 16]





parameter


[@dbname =] ' dbname '





the name of the database to attach to the server. The name must be unique. The dbname data type is sysname and the default value is NULL.





[@filename1 =] ' Filename_n '





the physical name of the database file, including the path. The Filename_n data type is nvarchar (260) and the default value is NULL. You can specify up to 16 file names. The parameter names are incremented to the @filename16, starting with the @filename1. The file name list must include at least the primary file, which contains system tables that point to other files in the database. The list must also include all files that were moved after the database was detached.





Return code value


0 (successful) or 1 (failed)





result set


No





annotation


should only perform sp_attach_db on databases that were previously detached from the database server using explicit sp_detach_db operations. If you must specify more than 16 files, use the CREATE DATABASE with the for ATTACH clause.





If the server to which you are attaching the database is not the server from which the database is detached, and the detached database is enabled for replication, you should run sp_removedbreplication to remove replication from the database.





Permissions


Only members of the sysadmin and dbcreator fixed server roles can perform this procedure.