I see that you optimized PostgreSQL, reducing query latency from 1200 milliseconds to 250 — can you tell me how you achieved this?

To optimize PostgreSQL and reduce query latency from 1200 to 250 ms, I used several approaches:

• Indexing: Added or reviewed indexes on fields involved in filters and joins.
• Execution plan analysis (EXPLAIN): Identified bottlenecks in queries and rewrote them for more efficient execution.
• Caching: Used application-level caching for frequently requested data.
• PostgreSQL configuration optimization: Adjusted parameters such as work_mem, effective_cache_size to better utilize resources.

Example of a query using an index:

CREATE INDEX idx_users_email ON users(email);

SELECT * FROM users WHERE email = 'example@example.com';

This significantly sped up email searches.