## Monitoring

### Use

We recommend that you monitor your database instance during production operation. This way, you can recognize problems early and avoid disruptions or failures.

### Activities

To monitor your database instance, use operating system functions, the Database Manager, the Event Dispatcher, the Database Analyzer and in SAP systems the CCMS (in particular the Database Alert Monitor or liveCache Alert Monitor).

You can use events to ensure that you are notified of critical database states. See Utilities, Event Dispatcher

#### Monitoring Free Memory in the Data Area

If the memory in the data area is full, the database system stops all current transactions and the database is unavailable for users. To avoid this, regularly check whether there is sufficient free memory in the data area. See

● Database Manager GUI, Displaying Data Area Information

● Database Manager CLI, info

● Database Administration in CCMS: MaxDB, Monitoring the Data Area

● Database Administration in CCMS: SAP liveCache Technology, Monitoring the Data Area

#### Monitoring Free Memory in the Log Area

If the memory in the log area is full, the database system cannot write any further redo log entries and therefore stops all transactions. The database is unavailable for users. To avoid this, regularly check whether there is sufficient free memory in the log area. See

● Database Manager GUI, Displaying Log Area Information

● Database Manager CLI, info

● Database Administration in CCMS: MaxDB, Monitoring the Log Area

● Database Administration in CCMS: SAP liveCache Technology, Monitoring the Log Area

#### Monitoring the Hit Rate for Access to the Caches

The lower the hit rate for database system access to the caches, the less efficiently the database system works. See

● Database Manager GUI, Displaying Cache Information

● Database Manager CLI, info

● Database Administration in CCMS: MaxDB, Caches

● Database Administration in CCMS: SAP liveCache Technology, Caches

#### Monitoring CPU Usage by the Database Instance

If the database instance has to share the computer’s processor(s) with too many other programs, performance can be poor. To avoid this, use operating system resources to monitor CPU usage by the processes of the database instance. See

● Overview of Processes

#### Monitoring Backups

Backups can fail for various reasons, for example if you have entered as the backup template a file in a directory that no longer exists at the time of the backup. The backup history displays which backups have been performed and if they were successful. For this reason, check the backup history regularly, in particular if you use automatic log backup or have automated the backup process using scripts. See

● Database Manager GUI, Displaying the Backup History

● Database Manager CLI, backup_history_list

● Database Management in CCMS, DBA History

Regularly check whether your backups are intact. See

● Database Manager GUI, Checking Backups

● Database Manager CLI, recover_check

#### Monitoring Database Structures

Hardware defects can cause errors in the database structures. For this reason, check the database structures regularly. See Checking Database Structures

#### Monitoring Database Activities

Monitor the following database activities:

● I/O activity

● Lock activity

● Logging activity

See

● Database Manager GUI, Displaying Database Activities

● Database Manager CLI, info

● Database Management in CCMS, Activities Overview

#### Monitoring the Number of Database Sessions

If the maximum number of possible database sessions has been reached, no further users can log on to the database instance. For this reason, monitor the number of database sessions.

See

● Database Manager GUI, Displaying Database Sessions

● Database Manager CLI, info

● Database Administration in CCMS: MaxDB, User Tasks

● Database Administration in CCMS: SAP liveCache Technology, User Tasks

#### Monitoring Security-Relevant Activities

See

● MaxDB Security Guide, Checking Log Files for Failed Logon Attempts

See also:

Log Files

Troubleshooting

Performance

Event Dispatcher documentation

Database Analyzer documentation