Viewing Server Logs - SQL Server to Aurora PostgreSQL Migration Playbook
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China.

Viewing Server Logs

Feature compatibility Amazon SCT / Amazon DMS automation level Amazon SCT action code index Key differences


                              Three star feature compatibility

N/A

N/A

View logs from the Amazon RDS console, the Amazon RDS API, the Amazon CLI, or the Amazon SDKs.

SQL Server Usage

SQL Server logs system and user generated events to the SQL Server Error Log and to the Windows Application Log. It logs recovery messages, kernel messages, security events, maintenance events, and other general server level error and informational messages. The Windows Application Log contains events from all windows applications including SQL Server and SQL Server agent.

SQL Server Management Studio Log Viewer unifies all logs into a single consolidated view. You can also view the logs with any text editor.

Administrators typically use the SQL Server Error Log to confirm successful completion of processes, such as backup or batches, and to investigate the cause of run time errors. These logs can help detect current risks or potential future problem areas.

To view the log for SQL Server, SQL Server Agent, Database Mail, and Windows applications, open the SQL Server Management Studio Object Explorer pane, navigate to Management, SQL Server Logs, and choose the current log.

The following table identifies some common error codes database administrators typically look for in the error logs:

Error code Error message

1105

Couldn’t allocate space.

3041

Backup failed.

9002

Transaction log full.

14151

Replication agent failed.

17053

Operating system error.

18452

Login failed.

9003

Possible database corruption.

Examples

The following screenshot shows the typical log file viewer content:


                  Log file viewer

For more information, see Monitoring the Error Logs in the SQL Server documentation.

PostgreSQL Usage

Amazon Aurora PostgreSQL-Compatible Edition (Aurora PostgreSQL) provides administrators with access to the PostgreSQL error log.

The PostgreSQL error log is generated by default. To generate the slow query and general logs, set the corresponding parameters in the database parameter group. For more information, see Server Options in SQL Server and Parameter Groups in Amazon Aurora.

You can view Aurora PostgreSQL logs directly from the Amazon RDS console, the Amazon RDS API, the Amazon CLI, or the Amazon SDKs. You can also direct the logs to a database table in the main database and use SQL queries to view the data. To download a binary log, use the Amazon Console.

The following table includes the parameters, which control how and where PostgreSQL places log and errors files.

Parameter Description

log_filename

Sets the file name pattern for log files. You can modify this parameter in an Aurora Database Parameter Group.

log_rotation_age

(min) Automatic log file rotation will occur after N minutes. You can modify this parameter in an Aurora Database Parameter Group.

log_rotation_size

(kB) Automatic log file rotation will occur after N kilobytes. You can modify this parameter in an Aurora Database Parameter Group.

log_min_messages

Sets the message levels that are logged such as DEBUG, ERROR, INFO, and so on. You can modify this parameter in an Aurora Database Parameter Group.

log_min_error_statement

Causes all statements generating errors at or above this level to be logged such as DEBUG, ERROR, INFO, and so on. You can modify this parameter in an Aurora Database Parameter Group.

log_min_duration_statement

Sets the minimum run time above which statements will be logged (ms). You can modify this parameter in an Aurora Database Parameter Group.

Examples

The following walkthrough demonstrates how to view the Aurora PostgreSQL error logs in the Amazon RDS console.

  1. In the Amazon console, choose RDS, and then choose Databases.

  2. Choose the instance for which you want to view the error log.

    
                           Log file viewer

  3. Scroll down to the logs section and choose the log name. The log viewer displays the log content.

For more information, see PostgreSQL database log files in the Amazon Relational Database Service User Guide.