This article describes common issues with developing Stream Analytics queries and how to troubleshoot. This article describes common issues with developing Azure Stream Stream problems formula query queries, how to troubleshoot query issues, and how to correct the issues. Many troubleshooting steps require resource logs to be enabled for your Stream Analytics job.
If you do not have resource logs enabled, see Troubleshoot Azure Stream Analytics by using resource logs. Each query step is mapped to a temporary result set defined in the script using the WITH statement.
You can view the data, as well as quwry, in each intermediate result set to find the source of the issue. If you use Timestamp Byverify that the probblems have timestamps greater than the job start time.
Ensure event ordering policies are configured as expected. Go to Settings and select Event Ordering. The policy is not applied when you use the Test button to test the query. This result is one difference between testing in-browser versus running the job in problfms.
Ensure you take advantage of parallelization in Azure Stream Analytics. You can learn to scale with query parallelization of Stream Analytics jobs by configuring input partitions and tuning the analytics query definition.
High utilization indicates that the job is using close to the maximum allocated resources. In real-time data processing, knowing what the data looks like in the middle of the query can be helpful.
You can see this using stream problems formula query job diagram in Visual Studio. If you don't have Visual Studio, you can take additional steps to output intermediate data. Doing so outputs intermediate data into storage and lets you inspect the correctness of the data, just as watch stream problems formula query do when you debug a stgeam.
The following example query in an Azure Stream Analytics job has problemz stream input, two reference data inputs, and an output to Azure Table Storage.
The query joins data from the event hub and two reference blobs to get the name and category information:.
Note stream problems formula query the job is running, but no events are being produced in the output. In this example, we've added two new "temporary outputs.
Here we use Azure Storage as an example:. Now start the job again, and let it run for a few minutes. Then query temp1 and temp2 with Visual Studio Cloud Explorer to produce the following tables:.
As you can see, temp1 and temp2 both have data, and the name column is populated stream problems formula query in temp2. However, because there is still no data in output, something is stream problems formula query. By sampling the data, you can be almost certain that the issue is with the second JOIN.
You can download the reference data from the blob and take a look:. As you can see, the format of the GUID in this reference data is different from the format of the [from] column in temp2.
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