Azure Cosmos DB 中的索引指标

    string sqlQueryText = "SELECT TOP 10 c.id FROM c WHERE c.Item = 'value1234' AND c.Price > 2";

    QueryDefinition query = new QueryDefinition(sqlQueryText);

    FeedIterator<Item> resultSetIterator = container.GetItemQueryIterator<Item>(
                query, requestOptions: new QueryRequestOptions
        {
            PopulateIndexMetrics = true
        });

    FeedResponse<Item> response = null;

    while (resultSetIterator.HasMoreResults)
        {
          response = await resultSetIterator.ReadNextAsync();
          Console.WriteLine(response.IndexMetrics);
        }

    SqlQuerySpec querySpec = new SqlQuerySpec("SELECT TOP 10 c.id FROM c WHERE c.Item = 'value1234' AND c.Price > 2");
    CosmosQueryRequestOptions options = new CosmosQueryRequestOptions();
    options.setIndexMetricsEnabled(true);

    CosmosPagedIterable<JsonNode> items = container.queryItems(querySpec, options, JsonNode.class);

    // Print
    items.iterableByPage().forEach(itemResponse -> {
        logger.info("diagnostics: {}", itemResponse.getCosmosDiagnostics());
        for (JsonNode item : itemResponse.getResults()) {
            logger.info("Item: {}", item.toString());
        }
    });  

    SqlQuerySpec querySpec = new SqlQuerySpec("SELECT TOP 10 c.id FROM c WHERE c.Item = 'value1234' AND c.Price > 2");
    CosmosQueryRequestOptions options = new CosmosQueryRequestOptions();
    options.setIndexMetricsEnabled(true);

    CosmosPagedFlux<JsonNode> items = container.queryItems(querySpec, options, JsonNode.class);
    
    // Print
    items.byPage(100).flatMap(itemsResponse -> {
        logger.info("diagnostics: {}",itemsResponse.getCosmosDiagnostics());
        for (JsonNode item : itemsResponse.getResults()) {
            logger.info("Item: {}", item.toString());
        }
        executeCountQueryPrintSingleResultNumber.incrementAndGet();
        return Flux.just(itemsResponse);
    }).blockLast();   

const querySpec = {
    query: "SELECT TOP 10 c.id FROM c WHERE c.Item = 'value1234' AND c.Price > 2",
  };
const { resources: resultsIndexMetrics, indexMetrics } = await container.items
    .query(querySpec, { populateIndexMetrics: true })
    .fetchAll();
console.log("IndexMetrics: ", indexMetrics);

可以通过在查询项中传入 populate_index_metrics 关键字，然后从响应中读取“x-ms-cosmos-index-utilization”标头的值，来捕获索引指标。 仅当查询返回某些项时才会返回此标头。

query_items = container.query_items(query="Select * from c",
    enable_cross_partition_query=True,
    populate_index_metrics=True)

print(container.client_connection.last_response_headers['x-ms-cosmos-index-utilization'])