Slow Query Logs

Precautions

• To use the slow query log function, you need to toggle on Collect Slow Query Logs. Then DAS will store slow query logs for analysis.
• Slow query logs of free instances are retained for only one hour while those of paid instances are retained for seven days by default and can be retained for up to 30 days. After the retention period expires, slow query logs are deleted.
• You can enable the slow query logs function for a maximum of 10 free instances. There is no such a limit on paid instances.
• For free instances, you can only view slow query logs generated in the latest hour.

Viewing Slow Query Logs

1. Log in to the DAS console.
2. Click in the upper left corner and select a region and project.
3. Click in the upper left corner, and under Databases, click Data Admin Service.
4. In the navigation pane, choose Intelligent O&M > Instance List.

   Alternatively, on the Overview page, click Go to Intelligent O&M.

5. In the upper right corner of the Instance List page, search for instances by engine type, instance name, or instance IP.
   Figure 1 Searching for instances
   

6. Locate the instance whose slow query logs you want to manage and click Details.
7. Choose SQL > Slow Query Logs.
8. Select a time range and view trends, statistics, and details of the slow query logs generated within the time range.
   • Log trends
     Figure 2 Slow queries over time
     

     In the trends graph, you can hover your mouse at any point in time to view slow query logs or CPU usage.

     Above the chart, you can switch to another instance or node to view slow queries by instance or by node.

   • Log details
     View slow query log details in the lower part of the Slow Query Logs area. The details include the SQL statement, execution time, database name, client, user, execution duration, lock wait duration, and scanned and returned rows.

     Figure 3 Viewing slow query log details
     

     Click Export to export slow query log details to a specific OBS bucket. After the details are exported, you can click Export History to view export records. You can also download the details to your local PC.

     Figure 4 Exporting slow query log details
     
     

     This function is available to only paid instances.

     Locate the SQL template you want to diagnose and click Diagnose in the Operation column.

   • Slow query log statistics
     Figure 5 Slow query log statistics
     

     Click Sample in the Operation column to view the sample of the SQL statement template.

     On the Statistics page, click Export to export slow query logs to a specific OBS bucket. Then you can click Export History to view export records. You can also download the exported slow query logs to your local PC.

     

     This function is available to only paid instances.

Slow Query Log Storage

After Collect Slow Query Logs is enabled, SQL text content will be stored in OBS for analysis.

Slow query logs of free instances are retained for only one hour while those of paid instances are retained for seven days by default and can be retained for up to 30 days. After the retention period expires, slow query logs are deleted.

For paid instances, you can click Log Settings to set the storage duration on the Slow Query Logs tab page.

Figure 6 Setting storage duration for slow query logs

Each paid instance can use 5 GB of storage for slow query logs for free. Any storage used in excess of 5 GB will be billed on a pay-per-use basis.