如果查询结果显示recovery_model_desc为SIMPLE,则当前数据库处于简单恢复模式。 检查是否使用了backup log语句: 在简单恢复模式下,不允许使用BACKUP LOG语句。BACKUP LOG语句仅在完整恢复模式或大容量日志恢复模式下有效,用于备份事务日志。 如果在simple模式下使用了backup log语句,给出错误提示: 如果在简单恢复模式下...
A continuous sequence of T-Log backups is tied by a ‘Log Chain’, which starts with a FULL backup. Now, unless we run anything explicitly that breaks the log-chain (Ex., running BACKUP log TRUNCATE_ONLY* or by switching to SIMPLE recovery model), the existing chain remai...
Usually, a new log chain is only started when the database is backed up for the first time or after the recovery model is switched from simple recovery to full or bulk-logged recovery. Unless you choose to overwrite existing backup sets when creating a full database backup, the existing ...
A new log chain starts either with the first full database backup following database creation or after switching from the simple recovery model to the full or bulk-logged recovery model. In the first log backup in a chain, backupset.begins_log_chain = 1. The first_lsn and last_lsn are ...
Under the simple recovery model, after a checkpoint. Under the full recovery model or bulk-logged recovery model, after a log backup, if a checkpoint has occurred since the previous backup.Log truncation can be delayed by various factors. In the event of a l...
Backup and restore operations occur within the context of a recovery model. A recovery model is a database property that controls how transactions are logged, whether the transaction log requires (and allows) backing up, and what kinds of restore operations are available....
and log backup duration is every 15 mints and there is no High availability between the servers.Note: Changing to simple recovery model may resolve but App team is required to run in Full recovery model as they need of log backups.
RESTORE LOG <database_name> FROM <backup_device> WITH RECOVERY; GO Wait to recover the database by using a separate RESTORE DATABASE statement: Másolás RESTORE LOG <database_name> FROM <backup_device> WITH NORECOVERY; RESTORE DATABASE <database_name> WITH RECOVERY; GO ...
Typically, truncation occurs automatically under the simple recovery model when database is backed up and under the full recovery model when the transaction log is backed up. However, truncation can be delayed by a number of factors. For more information, see Factors That Can Delay Log Truncation...
The difference is that the FULL Recovery Model permits the Log to grow indefinitely, while the SIMPLE Recovery Model truncates the Log after every backup. For many environments, the SIMPLE Recovery Model is far better. I think the newbie should have asked more questions. For example, what job...