# Tracing a paged query

A paged query performs multiple simple/prepared queries to query subsequent pages.<br />
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If tracing is enabled the row iterator will contain a list of tracing ids for all performed queries.

## Tracing `Session::query_iter`

```rust
use scylla::statement::unprepared::Statement;
use scylla::observability::tracing::TracingInfo;
use futures::StreamExt;
use uuid::Uuid;

// Create a Statement manually and enable tracing
let mut query: Statement = Statement::new("SELECT * FROM ks.tab");
query.set_tracing(true);

// Create a paged query iterator and fetch pages
let mut row_stream = session
    .query_iter(query, &[])
    .await?
    .rows_stream::<(i32,)>()?;
while let Some(_row) = row_stream.next().await {
    // Receive rows
}

// Now there are tracing ids for each performed query
let tracing_ids: &[Uuid] = row_stream.tracing_ids();

for id in tracing_ids {
    // Query tracing info from system_traces.sessions and system_traces.events
    let tracing_info: TracingInfo = session.get_tracing_info(id).await?;
    println!("tracing_info: {:#?}", tracing_info);
}
```

## Tracing `Session::execute_iter`

```rust
use scylla::statement::prepared::PreparedStatement;
use scylla::observability::tracing::TracingInfo;
use futures::StreamExt;
use uuid::Uuid;

// Prepare the statement
let mut prepared: PreparedStatement = session
    .prepare("SELECT a FROM ks.tab")
    .await?;

// Enable tracing for the prepared statement
prepared.set_tracing(true);

// Create a paged query iterator and fetch pages
let mut row_stream = session
    .execute_iter(prepared, &[])
    .await?
    .rows_stream::<(i32,)>()?;
while let Some(_row) = row_stream.next().await {
    // Receive rows
}

// Now there are tracing ids for each performed query
let tracing_ids: &[Uuid] = row_stream.tracing_ids();

for id in tracing_ids {
    // Query tracing info from system_traces.sessions and system_traces.events
    let tracing_info: TracingInfo = session.get_tracing_info(id).await?;
    println!("tracing_info: {:#?}", tracing_info);
}
```