Monitor active queries

MySQL   |  PostgreSQL   |  SQL Server

Preview — Gemini in Databases

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This page describes how to monitor and troubleshoot the queries that are active in your database. Monitoring these queries can help identify causes of system latency and high CPU usage.

Note: All Gemini in Databases features are supported on MySQL 8.0.

On the Query Insights dashboard, you can view a summary of active transactions and a list of transactions with associated query and statistics. The transactions are displayed by the transaction start time. If there is a large number of queries running, the results may be limited to a subset of total queries.

Before you begin

To view your active queries, you must do the following:

1. Set up Gemini in Databases.
2. Create a custom role and add the following permissions:

   Tasks	Roles	Permissions
   View recommendations	databaseinsights.viewer	databaseinsights.activeQueries.fetch databaseinsights.activitySummary.fetch
   Terminate recommendations	databaseinsights.operationsAdmin	N/A

View active queries

To view your active queries, do the following:

1. Add this role for each user that is viewing active queries.

2. In the Google Cloud console, go to the Cloud SQL Instances page.

   Go to Cloud SQL Instances

3. To open the Overview page of an instance, click the instance name.

4. Do one of the following to display the Query insights dashboard:

   • Select the Query insights tab.
   • Click Go to Query insights for more in-depth info on queries and performance. The Query insights dashboard opens. It shows details about the instance at the top.

5. Click the Active query view tab.

   From here, you can modify the query information that appears in the Longest running transactions table:

   • Database: filters query load on a specific database or all databases.
   • User: filters query load from a specific user account.
   • Summary scorecard of all active queries: provides an overview of all the active queries by displaying the total connections based on the following parameters:
     1. Distribution of active connections categorized by connection state.
     2. Distribution of active transactions based on transaction state.
     3. Distribution of query durations.
     4. Longest running transactions: provides an overview of the top 50 running queries (in the active state) based on descending execution time. You can filter and sort active queries in the table.

View normalized active queries

You can view a list of top long-running transactions with normalized active queries on the Query insights dashboard. A normalized active query removes sensitive data and returns a digest. The digest is the same for different values used in the following example:

• Regular queries

  • select * from test_table where id=1;
  • select * from test_table_where id=2;

• Digest or normalized query

  • select * from test_table where id=?;

A query that runs in different sessions is displayed as different entries on the dashboard.

View top longest running transactions

The Longest running transactions table on the Query insights dashboard contains the following columns:

Column name	Description
Process ID	Unique identifier of the connection.
Query	SQL query text.
Transaction status	The current execution state of the transaction. Permitted values include: RUNNING, LOCK WAIT, ROLLING BACK, and COMMITTING.
Thread state	Thread state (or query state) indicates the current state of the active thread.
Transaction start time	The timestamp when the transaction started its execution.
Transaction duration	The duration of current active transaction in seconds.
Transaction wait duration	The duration of wait in seconds on current active transaction.
Thread state duration	Time elapsed in the query.
Transaction rows locked	Number of rows locked by the current active transaction.
Transaction rows modified	Number of rows modified by the current active transaction.
Database	Database name on which this connection is running.
User name	Name of the user connected to the database.
Client address	The IP address of client from where a user connects to the database.
Action	Contains a link for terminating a transaction.

The display is refreshed every 60 seconds automatically.

Note: Data comes from the innodb_trx and processlist tables. Because both tables collect data separately, the transaction state and thread state might be captured at different point in time.

Terminate a connection

To terminate a query or a transaction, you must have the databaseinsights.operationsAdmin role. For more information, see IAM basic and predefined roles reference.

To terminate a query or transaction, complete the following steps:

1. In the Longest running transaction table, select a query.
2. In the Action column, click Terminate connection.
3. In the Terminate connection window, click Confirm.

A database request returns immediately while the termination happens in the background.

Note: The page refreshes after initiating termination. If termination fails, it is silent and the query continues showing up in the Active Query list. If termination is successful, the query no longer displays in the list. If the termination requires a rollback, the Txn state column shows the ROLLING BACK state, which means that termination is still in progress.

Note: If the Terminate button is disabled, you might have insufficient IAM permissions. For more information, see Before you begin.