Oracle's alert.log
chronologically records messages and errors arising from the daily database operation. Also, there are pointers
to trace files
and dump files.
alert.log is a text file that can be opened with any text editor. The directory where it is found can be determined by the
background_dump_dest
initialization parameter:
If the background_dump_dest parameter is not specified, Oracle will write the alert.log into the $ORACLE_HOME
/RDBMS/trace
directory.
Common messages in the alert log
ARCx: Media recovery disabled
It's unfortunately possible for ARCH to be sitting around doing nothing
apart from just taking up memory when the database is in noarchive log
mode.
Ignoring SIGALARM
Such a message is written into the alert log when a process that waited for a semaphore
gets the
semaphore shortly befor the timeout
expires and doesn't have the time
to switch the timeout mechanism off.
Thread 1 cannot allocate new log, sequence 1558 Checkpoint not complete
Usually, this message is a sign that the size of the redo logs is to small or that there should be more of them.
Rotating the alert logs
Within
Oracle, it is perfectly possible to delete, or rename, the alert.log,
if desired (for example, if it reaches a certain size). Oracle simply
recreates a new alert.log the next time it writes to it.
Linux (and other Unixes?) has an utility called logrotate
to automate that task.
Writing own messages into the alert log
The undocumented procedure kdswrt in dbms_system
allows to write own messages in the
alert log.
begin
sys.dbms_system
.ksdwrt(2, 'My own message');
end;
/
Reading the alert log through an external table
Here
is a procedure which creates an external table
that can be used to read the alert.log.
|
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