Myth-busting field notes · Taiwan
Data Quartz Engineering Consulting
Project-based programming consulting for teams stuck between ORM defaults and production-grade SQL — schema design, index strategy, and query plans you can defend in review.
Data Quartz Engineering Consulting (sole proprietorship) · UBN: 88251163 · Responsible Person: Huang Yi-Chen
“The ORM already optimizes our queries”
Object-relational mappers generate SQL from patterns, not from your cardinality or isolation needs. When latency spikes, the fix is rarely a framework toggle — it is understanding which predicates sarg, which joins explode row counts, and where statistics lie.
We take fixed-scope projects: read your execution plans, map hot paths, and propose schema or index changes with migration notes your engineers can ship.
Typical inputs include PostgreSQL, MySQL, or SQL Server workloads with measurable slow-query logs — not greenfield toy apps.
“Adding an index always speeds things up”
Covering indexes help only when the optimizer can use them end-to-end. Duplicate or wide indexes slow inserts, enlarge backups, and confuse plan choice. We model read/write trade-offs before recommending physical design.
Deliverables stay concrete: annotated plans, revised DDL, and benchmark queries — priced as projects, not open-ended retainers unless you ask for one.
Who this is for (and who it is not)
For engineering leads with production regressions
You have APM or slow-query evidence, can grant read-only schema access, and want a written optimization plan — not a slide deck about “digital transformation.”
Not for vanity rewrites
We do not rebuild applications to chase micro-benchmarks when business logic is the bottleneck. If the database is healthy, we will say so.
Not for unverifiable guarantees
We do not promise fixed millisecond latencies without measuring your data. Fair Trade–sensitive claims stay off this site.