Oracle database log information can be queried through the following methods: use SQL statements to query from the v$log view; use the LogMiner tool to analyze log files; use the ALTER SYSTEM command to view the status of the current log file; use the TRACE command to view specific Information about the event; use operating system tools to view the end of the log file.
Oracle database log query method
1. Use SQL statement query
Use the SELECT
statement to query log information from the v$log
view. For example:
SELECT * FROM v$log ORDER BY sequence#;
This query returns all log files and their related information, including serial number, file size, last modification time, etc.
2. Use the LogMiner tool
The LogMiner tool is a set of PL/SQL packages used to analyze log files. You can use the DBMS_LOGMNR.V$LOGMNR_CONTENTS
view to view the log content. For example:
SELECT * FROM DBMS_LOGMNR.V$LOGMNR_CONTENTS(SEQUENCE# => 100);
This query returns the contents of the file with log sequence number 100.
3. Use the ALTER SYSTEM command
The ALTER SYSTEM
command can be used to view the status of the current log file. For example:
ALTER SYSTEM LIST LOGFILE;
This command returns information about all log files currently in use, including path, size and status.
4. Use the TRACE command
The TRACE
command can be used to view information about specific events in the log file. For example:
TRACE FILE_NAME='redo01.log' EVENT='commit';
This command returns the information of all submitted events in the redo log file redo01.log
.
5. Use OS tools
Some operating systems (such as Linux) provide tools for viewing log files. For example, you can use the tail
command to view the end of the log file:
<code>tail -f /oracle/oradata/redo01.log</code>
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