How to query oracle database logs

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:

<code class="sql">SELECT * FROM v$log ORDER BY sequence#;</code>

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:

<code class="sql">SELECT * FROM DBMS_LOGMNR.V$LOGMNR_CONTENTS(SEQUENCE# => 100);</code>

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:

<code class="sql">ALTER SYSTEM LIST LOGFILE;</code>

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:

<code class="sql">TRACE FILE_NAME='redo01.log' EVENT='commit';</code>

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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