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.

33 ms

2.8%

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.

2.49 / hour

3.2%

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 10 16.9 ms 1.0 ms 35.0 ms
Sep 22, 2026 64 18.13 ms 1.0 ms 35.0 ms
Sep 21, 2026 60 17.72 ms 1.0 ms 35.0 ms
Sep 20, 2026 58 18.45 ms 1.0 ms 35.0 ms
Sep 19, 2026 56 18.41 ms 2.0 ms 35.0 ms
Sep 18, 2026 50 17.36 ms 1.0 ms 35.0 ms
Sep 17, 2026 61 15.07 ms 1.0 ms 35.0 ms
Sep 16, 2026 66 16.27 ms 1.0 ms 34.0 ms
Sep 15, 2026 51 20.14 ms 1.0 ms 35.0 ms
Sep 14, 2026 57 17.35 ms 2.0 ms 42.0 ms
Total of 15 record(s).
Page 1 of 2

Normalized Query 

SELECT users.*, COUNT(DISTINCT posts.id) as post_count, COUNT(DISTINCT comments.id) as comment_count, SUM(posts.view_count) as total_views, AVG(posts.view_count) as avg_views, MIN(posts.created_at) as first_post, MAX(posts.created_at) as latest_post FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON users.id = comments.user_id GROUP BY users.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
3
Joins
2
Complexity Score
12
Has LIMIT
No
Has ORDER BY
No
Has GROUP BY
Yes
Has Subqueries
No
Issues Detected
  • SELECT query without WHERE clause may return excessive data
Optimization Suggestions
  • Add single_column index: add_index :comments, :user_id — Fast JOIN execution
    add_index :comments, :user_id
  • Add single_column index: add_index :posts, :user_id — Fast JOIN execution
    add_index :posts, :user_id
  • Add WHERE clause to filter results — Avoid full table scans and reduce data transfer

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/controllers/dashboard_controller.rb:78 34.0 — 493
app/jobs/image_processing_job.rb:51 23.0 — 1
app/mailers/user_mailer.rb:54 17.0 — 1
app/jobs/import_job.rb:72 15.0 — 1
app/jobs/cache_warming_job.rb:67 23.0 — 1
app/jobs/notification_job.rb:108 42.0 — 1
app/jobs/image_processing_job.rb:116 25.0 — 1
app/jobs/analytics_job.rb:101 17.0 — 1

Raw Data 

{
  "query": {
    "id": 19,
    "normalized_sql": "SELECT users.*, COUNT(DISTINCT posts.id) as post_count, COUNT(DISTINCT comments.id) as comment_count, SUM(posts.view_count) as total_views, AVG(posts.view_count) as avg_views, MIN(posts.created_at) as first_post, MAX(posts.created_at) as latest_post FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON users.id = comments.user_id GROUP BY users.id",
    "analyzed_at": "2026-09-23 03:07:22 UTC"
  },
  "performance": {
    "total_executions": 500,
    "p95_duration_ms": "34.0",
    "avg_duration_ms": 17.594,
    "p95_row_count": null,
    "avg_row_count": null
  },
  "characteristics": {
    "query_type": "SELECT",
    "table_count": 3,
    "join_count": 2,
    "where_clause_complexity": 0,
    "has_subqueries": false,
    "has_limit": false,
    "has_order_by": false,
    "has_group_by": true,
    "has_having": false,
    "has_distinct": true,
    "has_aggregations": true,
    "estimated_complexity": 12
  },
  "call_locations": [
    {
      "location": "app/controllers/dashboard_controller.rb:78",
      "count": 493,
      "p95_duration_ms": "34.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/image_processing_job.rb:51",
      "count": 1,
      "p95_duration_ms": "23.0",
      "p95_row_count": null
    },
    {
      "location": "app/mailers/user_mailer.rb:54",
      "count": 1,
      "p95_duration_ms": "17.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/import_job.rb:72",
      "count": 1,
      "p95_duration_ms": "15.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/cache_warming_job.rb:67",
      "count": 1,
      "p95_duration_ms": "23.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/notification_job.rb:108",
      "count": 1,
      "p95_duration_ms": "42.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/image_processing_job.rb:116",
      "count": 1,
      "p95_duration_ms": "25.0",
      "p95_row_count": null
    },
    {
      "location": "app/jobs/analytics_job.rb:101",
      "count": 1,
      "p95_duration_ms": "17.0",
      "p95_row_count": null
    }
  ],
  "n_plus_one": {
    "detected": false
  },
  "index_recommendations": [
    "add_index :posts, :user_id",
    "add_index :comments, :user_id"
  ],
  "issues": [
    "SELECT query without WHERE clause may return excessive data"
  ]
}