Introduction to transaction traces

In APM, a transaction trace gives a detailed snapshot of a single transaction in your application. A transaction trace records the available function calls, database calls, and external calls. You can use transaction traces to troubleshoot performance issues and to get detailed low-level insight into how your app is working.

What transactions record traces

In APM, a transaction trace records the segments that make up a transaction. Because they give you more detail, you can use transaction traces to analyze and troubleshoot performance issues.

Here are the default rules that govern which transactions a New Relic agent traces:

• Over the minute-long harvest cycle, all transactions that violate the threshold (either four times your Apdex T value or a specific number of seconds) are added to a pool of transactions.
• At the end of that minute, the New Relic agent selects the slowest transaction in that pool and performs a transaction trace on it.

These are the general rules, but there are some agent-specific differences. For example:

• The Java agent collects occasional non-slow transactions.
• If one transaction is frequently traced, some agents will select other transactions to give a more diverse sampling.

If you don't see traces in your account, it's possible that no transactions meet the necessary criteria. In this situation, you can adjust transaction trace settings to ensure some transactions will be traced.

If you use Synthetic, you will likely have Synthetic monitor traces. Synthetic traces can happen more frequently than APM traces, potentially several per minute.

Configure transaction traces

To configure or edit trace settings, see the procedures for:

• Transaction traces
• Key transaction traces

View transaction traces in UI

To view transaction traces:

1. Do one of the following:
   • New Relic Explorer: Go to one.newrelic.com > Explorer > (select an app) > Monitor > Transactions.
   • APM: Go to one.newrelic.com > APM > (select an app) > Monitor > Transactions.
2. In the Transaction traces section, click transaction traces to view additional details.

Troubleshoot an issue with transaction traces

If you expect to see transaction traces but do not see them, follow the troubleshooting procedures.

For more information about using transaction traces, slow queries, and service maps to solve performance issues, see Analyze performance issues.