P95 Query Time

P95 Query Time

The 95th percentile database query duration — 95% of queries complete faster than this. Weighted by execution frequency across all queries. Slow queries are often caused by missing indexes or N+1 patterns.

35 ms

18.2%

Compared to previous 7 days

Execution Rate

Query Execution Rate

Total database queries executed over the last 14 days, expressed as an average rate. Spikes may indicate N+1 queries or inefficient data access patterns.

13.71 / day

23.9%

Compared to previous 7 days

Query Responses

Query Responses

This panel shows all executions of this query, including performance metrics, duration distribution, and query execution details.

Click marker to copy SHA
Time Period ▼ Executions Avg Duration Min Duration Max Duration
Sep 23, 2026 3 21.33 ms 10.0 ms 30.0 ms
Sep 22, 2026 14 13.29 ms 2.0 ms 32.0 ms
Sep 21, 2026 9 15.56 ms 2.0 ms 35.0 ms
Sep 20, 2026 13 15.38 ms 6.0 ms 28.0 ms
Sep 19, 2026 14 25.57 ms 2.0 ms 34.0 ms
Sep 18, 2026 11 21.73 ms 9.0 ms 35.0 ms
Sep 17, 2026 11 20.0 ms 10.0 ms 29.0 ms
Sep 16, 2026 8 23.63 ms 4.0 ms 35.0 ms
Sep 15, 2026 16 23.25 ms 1.0 ms 39.0 ms
Sep 14, 2026 15 23.0 ms 4.0 ms 40.0 ms
Total of 15 record(s).
Page 1 of 2

Normalized Query 

SELECT COUNT(*) FROM comments WHERE post_id = ?

Diagnostics

Query Diagnostics

Automatically generated analysis for this query. Includes N+1 detection (from live request data), query characteristics, detected issues, optimization suggestions, and a database EXPLAIN plan. Click Re-analyze to regenerate.

Query Characteristics
Query Type
SELECT
Tables
1
Joins
0
Complexity Score
3
Has LIMIT
No
Has ORDER BY
No
Has GROUP BY
No
Has Subqueries
No
Optimization Suggestions
  • Add single_column index: add_index :comments, :post_id — Fast lookups for post_id = value queries
    add_index :comments, :post_id
Execution Plan
3 | 0 | 53 | SEARCH comments USING COVERING INDEX index_comments_on_post_id (post_id=?)

Query Locations

Query Locations

Shows where in your codebase this query originates, based on the last 30 days of executions. P95 duration and row count highlight the worst-case performance at each call site.

Location P95 Duration (ms) P95 Row Count Count
app/models/post.rb:18 34.0 — 162
app/jobs/webhook_delivery_job.rb:41 6.0 — 2
app/jobs/analytics_job.rb:33 39.0 — 1
app/jobs/notification_job.rb:111 36.0 — 1
app/jobs/cache_warming_job.rb:109 31.0 — 1
app/jobs/notification_job.rb:95 40.0 — 1
app/jobs/cache_warming_job.rb:91 23.0 — 1
app/jobs/image_processing_job.rb:94 8.0 — 1
app/jobs/cache_warming_job.rb:34 47.0 — 1
app/jobs/notification_job.rb:93 43.0 — 1
app/jobs/notification_job.rb:108 12.0 — 1
app/jobs/cache_warming_job.rb:100 28.0 — 1
app/jobs/cache_warming_job.rb:111 44.0 — 1
app/jobs/notification_job.rb:31 21.0 — 1
app/jobs/notification_job.rb:22 21.0 — 1
app/jobs/cleanup_job.rb:116 41.0 — 1
app/jobs/notification_job.rb:46 22.0 — 1
app/jobs/image_processing_job.rb:117 42.0 — 1
app/jobs/notification_job.rb:106 34.0 — 1
app/jobs/analytics_job.rb:19 32.0 — 1
app/jobs/report_generator_job.rb:39 10.0 — 1
app/jobs/notification_job.rb:114 6.0 — 1
app/jobs/cleanup_job.rb:119 33.0 — 1
app/jobs/cache_warming_job.rb:113 23.0 — 1
app/jobs/analytics_job.rb:63 22.0 — 1
app/mailers/user_mailer.rb:119 43.0 — 1
app/jobs/image_processing_job.rb:67 10.0 — 1
app/mailers/user_mailer.rb:14 17.0 — 1
app/jobs/cache_warming_job.rb:77 3.0 — 1
app/jobs/report_generator_job.rb:12 49.0 — 1

Raw Data 

{
  "query": {
    "id": 119,
    "normalized_sql": "SELECT COUNT(*) FROM comments WHERE post_id = ?",
    "analyzed_at": "2026-09-23 08:02:23 UTC"
  },
  "performance": {
    "total_executions": 192,
    "p95_duration_ms": "36.0",
    "avg_duration_ms": 20.5781,
    "p95_row_count": null,
    "avg_row_count": null
  },
  "characteristics": {
    "query_type": "SELECT",
    "table_count": 1,
    "join_count": 0,
    "where_clause_complexity": 1,
    "has_subqueries": false,
    "has_limit": false,
    "has_order_by": false,
    "has_group_by": false,
    "has_having": false,
    "has_distinct": false,
    "has_aggregations": true,
    "estimated_complexity": 3
  },
  "call_locations": [
    {
      "location": "app/models/post.rb:18",
      "count": 162,
      "p95_duration_ms": "34.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/webhook_delivery_job.rb:41",
      "count": 2,
      "p95_duration_ms": "6.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/analytics_job.rb:33",
      "count": 1,
      "p95_duration_ms": "39.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:111",
      "count": 1,
      "p95_duration_ms": "36.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:109",
      "count": 1,
      "p95_duration_ms": "31.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:95",
      "count": 1,
      "p95_duration_ms": "40.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:91",
      "count": 1,
      "p95_duration_ms": "23.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/image_processing_job.rb:94",
      "count": 1,
      "p95_duration_ms": "8.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:34",
      "count": 1,
      "p95_duration_ms": "47.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:93",
      "count": 1,
      "p95_duration_ms": "43.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:108",
      "count": 1,
      "p95_duration_ms": "12.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:100",
      "count": 1,
      "p95_duration_ms": "28.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:111",
      "count": 1,
      "p95_duration_ms": "44.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:31",
      "count": 1,
      "p95_duration_ms": "21.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:22",
      "count": 1,
      "p95_duration_ms": "21.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cleanup_job.rb:116",
      "count": 1,
      "p95_duration_ms": "41.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:46",
      "count": 1,
      "p95_duration_ms": "22.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/image_processing_job.rb:117",
      "count": 1,
      "p95_duration_ms": "42.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:106",
      "count": 1,
      "p95_duration_ms": "34.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/analytics_job.rb:19",
      "count": 1,
      "p95_duration_ms": "32.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/report_generator_job.rb:39",
      "count": 1,
      "p95_duration_ms": "10.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:114",
      "count": 1,
      "p95_duration_ms": "6.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cleanup_job.rb:119",
      "count": 1,
      "p95_duration_ms": "33.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:113",
      "count": 1,
      "p95_duration_ms": "23.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/analytics_job.rb:63",
      "count": 1,
      "p95_duration_ms": "22.0",
      "p95_row_count": null
    },
    {
      "location": "app/mailers/user_mailer.rb:119",
      "count": 1,
      "p95_duration_ms": "43.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/image_processing_job.rb:67",
      "count": 1,
      "p95_duration_ms": "10.0",
      "p95_row_count": null
    },
    {
      "location": "app/mailers/user_mailer.rb:14",
      "count": 1,
      "p95_duration_ms": "17.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:77",
      "count": 1,
      "p95_duration_ms": "3.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/report_generator_job.rb:12",
      "count": 1,
      "p95_duration_ms": "49.0",
      "p95_row_count": null
    }
  ],
  "n_plus_one": {
    "detected": false
  },
  "index_recommendations": [
    "add_index :comments, :post_id"
  ],
  "issues": [],
  "explain_plan": "3 | 0 | 53 | SEARCH comments USING COVERING INDEX index_comments_on_post_id (post_id=?)"
}