Activating or Deactivating Automatic Log Backup

Use

If you have activated automatic log backup, the database system backs up the redo log entries automatically.

Backups of redo log entries (log backups) are required so that the database can be restored to the desired point in time after certain system breakdowns. Redo log entries are where the database system logs all changes that database users have made to data.

Regular log backups are also important for another reason: The database system can overwrite a log segment of the log area with a new entry only after it has been backed up.

Note

You can also back up the redo log entries manually (see Backing Up Log Entries).

Prerequisites

You are logged on to the database as the database system administrator or as a DBM operator with server authorization for performing backups (see Glossary, Server Permission).
You can only back up redo log entries after at least one complete data backup has been carried out (see Backing Up Data).
You have created a backup template for log backups (see Defining Backup Templates).

Note
For automatic log backup, you cannot use pipes.
The database is in the ONLINE or ADMIN operational state.
Overwrite mode for the log area is switched off (see Activating or Deactivating the Overwrite Mode for the Log Area).
Only on Microsoft Windows:

If you want to back up data to a data carrier on a remote computer, perform the steps described in Database Administration, Backing Up and Restoring Data with Remote Computers.

Procedure

Select the database in the explorer tree.
In the context menu of the database, choose Administration.
Open the Overview tab page.
Choose Automatic Log Backup.

Activating Automatic Log Backup

Select Activate Automatic Log Backup.
Select the backup template.
Select when you want the system to run log backups.
- Create log backup when log segment is full (Default)
- Create a log backup every <number> seconds
Choose Activate.

Note

For log backups to data carriers of the file type, you have to archive the backup files regularly. To do this, use the database tool Database Manager CLI (see Database Manager CLI, archive_stage).

Deactivating Automatic Log Backup

Select Deactivate automatic log backup.
Choose Deactivate.

Switching to a Different Backup Template

Select Restart automatic log backup
Select the backup template.
Choose Restart.

Example

You have activated automatic log backup and specified the following backup template:

Table 1: Example of a Backup Template for a Log Backup
Property	Value
Name of the backup template	DEMODB_LOG
Backup type	LOG
Data carrier type	FILE
Data carrier (Device/File)	DEMODB_MYLOG Note that i you do not enter an absolute path, then the database system uses the run directory of the database, see Run directory. Example: C:\ProgramData\sdb\globaldata\wrk\DEMODB\DEMODB_LOG
Size of data carrier	No restriction (blank or 0)
Block size	8 pages
Overwritable	No

The system writes continuous log backups to the following backup files:

DEMODB_MYLOG.001

DEMODB_MYLOG.002

DEMODB_MYLOG.003

DEMODB_MYLOG.004

DEMODB_MYLOG.005

More Information

Database Administration, Backing Up Log Entries