Oracle 警告日誌 (alert log) 中包含哪些內容 ？

The alert file, or alert log, is a special trace file. The alert file of a database is a chronological log of messages and errors, which includes the following: 

• All internal errors (ORA-600), block corruption errors (ORA-1578), and deadlock errors (ORA-60) that occur
• Administrative operations, such as CREATE, ALTER, and DROP statements and STARTUP, SHUTDOWN, and ARCHIVELOG statements
• Several messages and errors relating to the functions of shared server and dispatcher processes
• Errors occurring during the automatic refresh of a materialized view
• The values of all initialization parameters at the time the database and instance start

Oracle uses the alert file to keep a log of these special operations as an alternative to displaying such information on an operator's console (although many systems display information on the console). If an operation is successful, a "completed" message is written in the alert file, along with a timestamp.