SAP Basis

ADM100 Lesson: Appendix - Database Logs
• User processes
• System error messages
The log is run as a circular memory file that is overwritten as soon as it
reaches a certain size. A new log file is created after every start of the
database system. A backup copy of the old log (knldiag.old) iscreated
before a restart of the database system.
All error and warning messages concerning the database system are
recorded in the error log (knldiag.err), including the messages for the
system start and stop.
MS SQL Server
Figure 26: MS SQL Server
The MS SQL Server logs all significant events such as starting
and stopping the database and error messages in the file
:\MSSql7\Log\Errlog. A new error log file is written at every
start of the MS SQL server. Multiple versions of these error log files are
stored as Errlog.1, Errlog.2, and so on. The oldest available version is
stored as Errlog.6. AteveryrestartoftheSQLserver,theoldestfileis
overwritten. If a serious database problem occurs, you should backup the
oldest file before the restart, so that this information is not lost.
TheseerrorlogfilescanbedisplayedintheEnterpriseManager.
Messages of the “SQLServerAgent” service that is required for backups are
also logged in the above directory in the file Sqlagent.out. Thelastsix
versions of this log are also retained.
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