log 0MSSQL事务日志备份及恢复实践（mssql tran）
Log 0 is an important full transaction log backup for Microsoft SQL Server database systems. Log 0 makes sure that all the data in the database is available for recovery and data integrity even in the case of catastrophic failure. It is important to keep Log 0 backup as current as possible to avoid data loss and hence this Log 0 backup should be done on a regular basis. The following is a step-by-step guide of how to do Log 0 MSSQL transaction log backup and restore.
Step one: First of all you need to create the necessary Log 0 backup script. For example, in Microsoft SQL Management Studio Express, you can enter the following code:
`BACKUP LOG [DatabaseName] TO DISK=’C:\Log0Backup\[DatabaseName]_Log0.bak’ GO`
This script will create an exact copy of a database’s log file, meaning that it stores the entire database’s transaction logs and will be used for recovering the database in case of a crash.
Step two: Next you need to set up a scheduled task for the script. It is important to create a job for Log 0 backup so that it happens on a regular basis and can be easily monitored. In Microsoft SQL Management Studio Express, you can create a job for Log 0 backup as follows:
`USE msdb;
GO
EXEC dbo.sp_add_job
@job_name = ‘MSSQL Log 0 Backup’,
@enabled = 1
GO
EXEC sp_add_jobstep
@job_name = ‘MSSQL Log 0 Backup’,
@step_name = ‘[Backup Log 0]’,
@subsystem = ‘TSQL’,
@command = ‘BACKUP LOG [DatabaseName] TO DISK=”C:\Log0Backup\[DatabaseName]_Log0.bak” GO’,
@retry_attempts = 0,
@retry_interval = 30;
GO
EXEC sp_add_jobschedule
@job_name = ‘MSSQL Log 0 Backup’,
@name = ‘MSSQL Log 0 Backup Schedule’,
@freq_type = 4,
@freq_interval = 1,
@freq_subday_type = 1,
@freq_subday_interval = 8
GO`
It is best to set the frequency for how often the script will run as an hourly schedule as database changes can occur frequently, so it is important to make sure the Log 0 backup is consistent.
Step three: Lastly, you need to set up a restore script so that you can restore the log backup in case of failure. The following is the restore script, which can also be created in Microsoft SQL Management Studio Express.
`RESTORE LOG [DatabaseName] FROM DISK = ‘C:\Log 0Backup\[DatabaseName]_Log0.bak’ WITH REPLACE GO`
Once the script is entered, the database can be restored from the Log 0 backup in the case of a crash.
In order to ensure data integrity and availability for MSSQL database systems, it is important to have a scheduled Log 0 backup and a restore script in place. This guide gives an overview of how to set up a Log 0 backup and a restore script in Microsoft SQL Management Studio Express. Hopefully this guide will be helpful in enabling quick recovery in the case of any disasters.
