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What is alert log file?
The alert log file (also referred to as the ALERT. LOG) is a chronological log of messages and errors written out by an Oracle Database. Typical messages found in this file is: database startup, shutdown, log switches, space errors, etc.
Which three activities are recorded in the database alert log?
The alert log of a database is a chronological log of messages and errors, including the following: All internal errors (ORA-600), block corruption errors (ORA-1578), and deadlock errors (ORA-60) that occur.
What is Lgwr?
Log Writer process (LGWR) is a background Process that writes redo log entries sequentially into redo log file. Redo log entries are generated in the redo log buffer of the SGA. If the database has a multiplexed redo log, then LGWR writes the same redo log entries to all of the members of a redo log file group.
Is there a script to monitor the alert log?
Many companies find it more cost effective and reliable to choose to use a remote DBA service that provides sophisticated alert log monitor software. The key to monitoring the alert log for critical messages is to use regular expressions which are available either in UNIX/Linux shell scripts or with SQL regular expressions.
What does a trace file and an alert log do?
An alert log is a file that provides a chronological log of database messages and errors. The trace file and alert log contain information about errors. To control the size of an alert log, you must manually delete the file when you no longer need it. Otherwise the database continues to append to the file.
Can you create a new monitoring alert file?
Oracle creates a new one if the file doesn’t exists but I want to be safe. Martin. you can do that, yes, most people do over time to roll the log. You mentioned that we can rename alert log without a problem. I thought that oracle keeps the file open throught out its life (until it is shut down).
How to monitor alert log in Enterprise Manager?
Enterprise Manager users that require the ability to monitor the alert log of database, cluster and ASM targets in Enterprise Manager Cloud Control. Note that this information applies to the standard predefined EM metrics and not to the user-defined metric alternatives.