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TRACING

The TRACING command is a toggle that allows the tracing functionality to be turned on:

TRACING ONNow Tracing is enabledTRACINGTracing is currently enabled. Use TRACING OFF to disable

Tracing is useful in that it can show why particular queries may be running slowly. A tracing report allows you to view things about a query, such as the following:

Nodes contacted
Number of SSTables read
Number of tombstones encountered
How long the query took to run

Tracing will be covered in more detail in Chapter 5, Performance Tuning.

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