## Displaying Log Area Information

You can display information on the size and current usage of the log area in the Database Manager GUI.

### Procedure

...

1. Select the required database instance in the list of database instances.
Connect to the DBM server for this database instance if necessary.

2. Choose Instance ® Information ® Log Area.

### Result

The display is divided into the following areas:

· Volumes: Information about the log volumes

· Settings: Information about the log settings, values of the database parameters MAXLOGVOLUMES and LOG_SEGMENT_SIZE

· Usage: Usage of the log area

· I/O: Reads and writes for each log volume

· Activity: Summary of the log activities

#### Volumes

Among other things, you see the following information for each log volume: name, size, type, and path in the run directory.

#### Settings

You can control redo log management by making various log settings. The following settings are displayed:

· Log Mode: See Log Mode
SINGLE: The log volumes are not mirrored.
MIRRORED: The log volumes are mirrored.

· Overwrite Mode: See Overwrite Mode for the Log Area
NORMAL: The log area cannot be overwritten until the log entries have been backed up.
OVERWRITE: The log area is overwritten when it is full.

· Redo Log Management: See Activating or Deactivating Redo Log Management
ACTIVATED: Redo log management is activated.
DEACTIVATED: Redo log management is deactivated.

See also:

Changing Log Settings

The number of log volumes is controlled by the general database parameter MAXLOGVOLUMES. The general database parameter LOG_SEGMENT_SIZE controls the size of segment that is chosen when log backups are made. The current values of these database parameters are displayed.

#### Usage

If the database instance is in the ONLINE operational state, you can display the usage of the log area.

Total Size | Total size of the log area
Free Log Area | Free log area
Used Log Area | Used log area
Unsaved Log Area | Size of the log area that has not yet been backed up
Log since last data backup | Log entries written since the last data backup

#### I/O

If the database instance is in the ONLINE operational state, you can display the read and write activities for each log volume.

#### Activity

Log Pages Written | Written log pages
Wait for Log Writer | Indicates how often it was necessary to wait for a log entry to be written
Group Commits | Indicates how often more than one transaction had to wait for the I/O operation for a log page
Log I/O Queue Overflow | Indicates how often a transaction had to wait to write a log entry because the log queue was full