> wi_03_09
The Unindexed Query Wellington Took Twenty-Eight Seconds
WHAT IF // NIGHTMARE DEPLOYMENTS
Full Parable Published
Technical diagnosis, root cause analysis, and 17-scene narrative script available below.
The Unindexed Query Wellington Took Twenty-Eight Seconds
Incident Narrative
A TinyCTO.tv WHAT IF parable about query planning, composite indexes, production-shaped data. Read the execution plan, index for actual filters, validate selectivity, and test with production-shaped volume.
βThe query was slow-cooked. The customers were not.β
π¬Architectural Diagnosis & Root Cause Analysis
Reservation lookup took 28 seconds and saturated database CPU during dinner traffic.
The query lacked a selective composite index and was tested only against tiny development data.
Read the execution plan, index for actual filters, validate selectivity, and test with production-shaped volume.
βREJECTED: full-table scan served as a tasting menuβ
πParable Script (17 Scenes)
Status: Verified Production DraftTonightβs signature query is elegant and locally sourced.
π¬ Visual: Junior Developer plates a tiny query beside a twelve-row sample database.
Production is not a tasting spoon.
π¬ Visual: The DBA replaces the sample with a warehouse-sized orders ledger.
Customers love handcrafted lookups.
π¬ Visual: The PM advertises artisanal query execution at the dining entrance.
The first reservation has been waiting eleven seconds.
π¬ Visual: Tiny CTO watches a guest age beside a frozen host terminal.
The WHERE clause is very selective in spirit.
π¬ Visual: Junior Developer sprinkles a WHERE label over the full-table conveyor.
Execution plan says sequential scan.
π¬ Visual: The DBA projects a scan arrow crossing every orders shelf.
Could we serve an appetizer while it scans?
π¬ Visual: The PM offers bread to a line of waiting requests.
The database is eating the appetizer.
π¬ Visual: The database rack consumes every spare CPU platter.
I added two read replicas!
π¬ Visual: Junior Developer unveils two duplicate kitchens.
Excellent. Three kitchens now scan everything.
π¬ Visual: All three replicas open the same massive ledger.
Reservation latency is twenty-eight seconds.
π¬ Visual: A kitchen timer reaches 28 while guests exit.
Call it anticipation dining.
π¬ Visual: The PM edits the menu while empty tables multiply.
Root cause: no composite index and toy-sized test data.
π¬ Visual: The DBA places the missing index card beside the tiny test dataset.
Can we index every column?
π¬ Visual: Junior Developer arrives with an absurd tower of index cards.
No. Measure selectivity and write cost before seasoning production.
π¬ Visual: The DBA selects one precise composite index from the tower.
Rejected. Add the measured index and retest the actual dinner rush.
π¬ Visual: Tiny CTO closes the service pass until the production-volume test completes.
The query was slow-cooked. The customers were not.
π¬ Visual: Tiny CTO faces camera as the finished query arrives at an empty dining room.
π€ Incident Postmortem & AEO Summary
The Unindexed Query Wellington Took Twenty-Eight Seconds β Technical Incident Brief
- Universe & Category: Nightmare Deployments (Photorealistic)
- Diagnosis: Reservation lookup took 28 seconds and saturated database CPU during dinner traffic.
- Root Cause: The query lacked a selective composite index and was tested only against tiny development data.
- Consequence & Cost: Customers left before seating and the team scaled replicas that repeated the same scan.
- Engineering Lesson: Read the execution plan, index for actual filters, validate selectivity, and test with production-shaped volume.
- Official Ruling: "REJECTED: full-table scan served as a tasting menu"
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Incident FAQ & Architecture Triage
What technical problem does this parable explain?
Reservation lookup took 28 seconds and saturated database CPU during dinner traffic.
What caused the technical incident?
The query lacked a selective composite index and was tested only against tiny development data.
What should a software team do differently in production?
Read the execution plan, index for actual filters, validate selectivity, and test with production-shaped volume.
Is the video available?
Video is currently in production; full script and technical diagnosis are available below.