View slow query logs of an ApsaraDB for MongoDB instance - Database Autonomy Service

Slow SQL queries significantly decrease the database stability. When issues such as high workloads and unstable performance occur on databases, database administrators (DBAs) or developers first check whether slow query logs are generated. Database Autonomy Service (DAS) provides the log analysis feature for slow queries. DAS collects statistics on and analyzes the SQL queries whose execution duration exceeds the specified threshold value and provides solutions. You can troubleshoot database performance issues with ease. This enhances system reliability and stability.

Prerequisites

A replica set instance or a sharded cluster instance is created in ApsaraDB for MongoDB.

Background information

Slow query logs are generated by the database kernel. Relevant parameters and thresholds vary based on the database engine. For more information, see the corresponding official documentation.

Procedure

Log on to the DAS console.
In the left-side navigation pane, click Instance Monitoring.
On the page that appears, find the database instance that you want to manage and click the instance ID. The instance details page appears.
In the left-side navigation pane, choose Request Analysis > Slow Logs.
On the Slow Logs page, specify a time range and view the trends, statistics, and details of the slow query logs within the specified time range.
Note
When you specify the time range, the end time must be later than the start time, and the interval between the start time and the end time cannot exceed 24 hours. You can query slow query logs within the previous month.
- In the Slow Log Trend section, you can click a point in time in the trend chart and view the statistics and details of the slow query logs at the point in time.
  Note
  If the content of an SQL statement is not completely displayed due to the length limits of the GUI, you can move the pointer over the SQL statement to view the complete content.
- If an ApsaraDB for MongoDB sharded cluster instance is used, you can view the number of slow queries on each node in the Nodes section.
- You can click Export Slow Log to download slow query logs to your computer.
- On the Slow Log Statistics tab, find the SQL template that you want to manage and click Sample in the Actions column. In the Slow Log Sample dialog box, view the slow query log sample of the SQL template.