Common log types and configuration methods in Oracle

Common log types and configuration methods in Oracle

Oracle database is one of the industry's leading relational database management systems. It provides a wealth of log types to record Database operational and performance information. In actual database management work, understanding and configuring these log types is very important for monitoring and optimizing the database. This article will introduce common log types and configuration methods in Oracle, and provide corresponding code examples for reference.

1. Redo log

Redo log is one of the most common log types in Oracle. It records all change operations that occur in the database, including inserts, updates, deletes, etc. Configuring Redo logs can improve database reliability and recovery capabilities. The following is a sample code for setting the size and number of Redo log files:

ALTER DATABASE ADD LOGFILE GROUP 1 ('/u01/app/oracle/oradata/log1a.rdo', '/u02/app/oracle/oradata/log1b.rdo') SIZE 100M;
ALTER DATABASE ADD LOGFILE GROUP 2 ('/u01/app/oracle/oradata/log2a.rdo', '/u02/app/oracle/oradata/log2b.rdo') SIZE 100M;

2. Archive log

Archive log is to archive the Redo log to a specified location for database backup and recovery. Configuring archive logs ensures that the database can be quickly restored to a consistent state in the event of a failure. The following is a sample code for configuring archive logs:

ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='LOCATION=/u01/app/oracle/archivelog';
ALTER SYSTEM SET LOG_ARCHIVE_FORMAT='%t_%s_%r.arc';
ALTER DATABASE ARCHIVELOG;

3. Monitoring logs

Oracle provides a variety of ways to monitor the running status of the database, such as AWR (Automatic Workload Repository), ADDM (Automatic Database Diagnostic Monitor), etc. Configuring these monitoring logs can help administrators discover database performance problems in time and optimize them. The following is a sample code to enable AWR:

EXEC DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT();

4. SQL tracing log

SQL tracing log records the execution plan and performance information of SQL statements, which is used to analyze and optimize the performance of SQL statements. Configuring SQL tracing can help developers and administrators locate slow queries and optimize them. The following is sample code to enable SQL tracing:

ALTER SESSION SET SQL_TRACE=TRUE;

Conclusion

By understanding and configuring common log types in Oracle, you can improve the reliability and performance of your database, and manage your database more efficiently. Administrators and developers should choose appropriate log configurations based on actual needs, and regularly monitor and optimize the database to ensure stable operation and efficient work of the database. I hope the code examples provided in this article are helpful to readers.

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