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Query Optimization & Performance Tuning

EXPLAIN ANALYZE, index optimization, query rewriting. 10-100x speedup.

Author: Paweł Wiszniewski · Updated:

Key takeaways

EXPLAIN ANALYZE, index optimization, query rewriting. 10-100x speedup.

  • ›Query analysis with EXPLAIN ANALYZE—understand query execution plans.
  • ›Index optimization—add missing indexes, remove unused ones.
  • ›Query rewriting—JOIN strategies, subquery optimization, materialized views.

Price: from €1,200

SERVICE DETAILS

I analyze slow queries using EXPLAIN ANALYZE, identify bottlenecks (full table scans, N+1 queries, missing indexes), rewrite queries for better performance, implement caching strategies, and benchmark improvements.

› INVESTMENT:

from €1,200
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Who this is for

  • Apps that slow down as data and users grow.
  • Companies facing rising cloud database bills.
  • Teams with reports and dashboards that take minutes to load.
  • Systems where single queries lock up the rest of the app.

What you get

  • Analysis of the slowest and most frequent queries from logs and EXPLAIN ANALYZE.
  • Index tuning: missing, unused and duplicate indexes.
  • Rewriting problem queries and eliminating N+1 patterns in the app code.
  • Caching where data rarely changes.
  • A before-and-after report with recommendations for the future.

How results are measured

  • Execution time of key queries before and after optimization.
  • CPU and memory load on the database server.
  • Cloud database infrastructure cost.
  • Application response time as users experience it.

Key Benefits

Query analysis with EXPLAIN ANALYZE—understand query execution plans.

Index optimization—add missing indexes, remove unused ones.

Query rewriting—JOIN strategies, subquery optimization, materialized views.

Caching strategies—Redis, database query result caching.

Monitoring setup—identify new slow queries before they impact production.

The Process

1

Slow Query Identification

Collect slow queries from logs, identify top offenders.

2

Analysis

Run EXPLAIN ANALYZE, identify full table scans and missing indexes.

3

Optimization

Rewrite queries, add indexes, implement caching.

4

Benchmarking

Benchmark before/after, document improvements, set up monitoring.

Frequently Asked Questions

How to check if an index is being used?

EXPLAIN ANALYZE—if there is no seq scan, the index is used.

When to create a composite index?

When queries filter on 2+ columns together. Order matters: equality columns first, range columns last.

Are partial indexes worth it?

Yes, when 70%+ of rows match the WHERE condition. Size reduction means faster scans.

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BIAŁYSTOK, PL
+48 732 022 086pawel.wiszniewski95@gmail.com