SQL Diagnosis

Usage Notes

• Only SELECT, INSERT, UPDATE, and DELETE statements can be diagnosed. An INSERT statement must contain a SELECT clause.
• SQL diagnosis history is stored on the DAS server only. If you delete SQL diagnosis history on the console, it will be also deleted from the DAS server.
• Well-formatted SQL statements are much easier to read. Only line breaks will be added, and there are no logic and semantic changes.
• All SQL statements in the SQL window will be formatted. You cannot format only one of them.

Procedure

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.
5. In the upper right corner of the Instance List page, search for instances by engine type, instance name, or instance IP address.
6. Locate the target instance and click Details.
7. Choose SQL > SQL Diagnosis. On the displayed dialog box, perform the following operations:
   • Diagnosing SQL Statements

     On the SQL Diagnosis tab page, select the database where you want to diagnose a SQL statement, enter a SQL statement, and click Diagnose. The diagnosis result page is displayed. You can optimize the SQL statement based on the diagnosis result.

   • Executing SQL Statements

     Select the target database, enter a SQL statement, and click Execute. The system executes the statement and displays a result set.

   • Formatting SQL Statements

     Select the target database, enter SQL statements, and click Format. The system formats all the SQL statements.

   • Viewing the Execution Plan

     Select the target database, enter SQL statements, and click View Execution Plan. The system executes all the SQL statements in sequence.