truncate log ili za"backup"it'. v dannom slu4ae leg4e zabackupit'
a eshe jelatel'no po4itat' vot eto:
Microsoft SQL Server does not truncate the transaction log when backing up the database. Therefore, when you are creating database backups, it is recommended that you set
the transaction log to be truncated automatically every time a checkpoint occurs in the database by setting the trunc. log on chkpt. database option to TRUE. This prevents the transaction log from becoming full, which would require the transaction log to be truncated manually.
If you
are producing only database backups, the backup interval should be long enough to keep the backup overhead from affecting production work, yet short enough to prevent the loss of significant amounts of data. Databases that do not contain critical data and have few modifications can be backed up on a
weekly or biweekly basis. Data that is more critical or more volatile may need to be backed up daily, or even more frequently. Some databases that are usually read-only may need to be backed up only after a periodic refresh with new data.
It is also prudent to have more than one backup
of the database. It is recommended that you maintain a rotating series of backup media, so that you have two or more versions of the database you can restore. This allows you to address situations in which a user may make some incorrect modifications that are not detected for some time, or to fall
back to an earlier backup if backup media is damaged.
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