Although it sounds obvious, knowing that a database is idle can help diagnose problems. Understanding what SQL is chiefly contributing to the load can help you understand what parts of your application are responsible for bottlenecks.Ī database that is completely idle has no active sessions and thus no load. Top activity shows SQL statements by default.
Breaking down database load by wait types can help you understand what kind of database mechanisms are chiefly contributing to the load. On the bottom, a top activity table shows what is contributing to database load for the time interval on the load chart.īy default, the load chart is color coded by wait type.At the top, a load chart shows the recent history of database load in units of average active sessions (AAS).Choosing the bar opens the Performance Insights dashboard. You can tell that this instance has Performance Insights enabled, because Current Activity is expressed in Sessions. This indicates that the DB instance is under heavy load. In the following example, an Aurora instance is showing red in the Current Activity bar.
Thus, whenever there is red in the bar, it means that the DB instance is saturated, and you should look at the Performance Insights dashboard to understand why. When the load exceeds host capacity, it changes to red. As the database load increases, the bar fills with blue. The vertical red line indicates the capacity of the host. An empty rectangle with a blue border indicates an idle instance. In the list of DB instances, a bar in the Current Activity column shows the database load of each instance that has Performance Insights enabled.
Measuring the average number of active concurrent sessions over time provides a clear picture of the load on the database. Sessions, in this case, is shorthand for “average active sessions,” sometimes abbreviated “AAS.” An active session is a database connection that has submitted a request to the database but has not yet received the response. Why does Performance Insights measure database load in sessions? Instances that have Performance Insights enabled show current activity measured in Sessions. Choose the bar under Current Activity for a DB instance to open the Performance Insights dashboard for that DB instance.Choose Performance Insights in the left navigation pane to open the dashboard and view a list of DB instances that have Performance Insights enabled.You can access Performance Insights through the Amazon RDS console in two places: Just sign in to the Amazon RDS console, and go to the Performance Insights dashboard to start monitoring performance with just one click. Or, use the EnablePerformanceInsights parameter of the CreateDbInstance or ModifyDbInstance API methods. You can enable it for other instances on the console by choosing Modify on the Instance actions menu. Performance Insights is enabled by default for instances that you create in the AWS Management Console.
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It also requires no configuration or maintenance, and it’s currently available as a free preview with Amazon Aurora PostgreSQL. Using a dashboard that visualizes database load-along with which SQL statements are causing the load and why-Performance Insights makes detecting performance problems easy for both experts and non-experts.īecause it collects performance data using lightweight methods, Performance Insights doesn’t impact the performance of your applications. With this release, AWS has also included the first release of a useful feature in Amazon Relational Database Service (Amazon RDS) called Performance Insights.
Sign Up to Preview Performance Insights with Additional Database EnginesĪWS recently announced general availability of Amazon Aurora with PostgreSQL compatibility.