feat(deploy): production deployment setup and fixes

- Debian-based api image (bookworm-slim), docker/debian mirrors, prisma binaryTargets for openssl 3.0 - nginx: admin SPA under /admin, TLS via acme.sh (ZeroSSL) + auto-renewal cron, http->https redirect - prisma: add origin_goods.delisted migration, sync missing schema (good_image/tag_font_color/good_tags), fix users.createdAt Timestamptz - api: CORS wildcard reflection, helmet CORP cross-origin, price backfill in persistProductDetail, categoryIcon ancestor fallback, mediaByColor per-color gallery in public goods detail - admin: /admin base path (vite + router) - import-data.mjs: udt_name casting, serial sequence advance fix
2026-08-26 14:23:09 +08:00
parent be0b90e68f
commit 6c61a4e871
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---
-title: Use EXPLAIN ANALYZE to Diagnose Slow Queries
-impact: LOW-MEDIUM
-impactDescription: Identify exact bottlenecks in query execution
-tags: explain, analyze, diagnostics, query-plan
---
-
-## Use EXPLAIN ANALYZE to Diagnose Slow Queries
-
-EXPLAIN ANALYZE executes the query and shows actual timings, revealing the true performance bottlenecks.
-
-**Incorrect (guessing at performance issues):**
-
-```sql
-- Query is slow, but why?
-select * from orders where customer_id = 123 and status = 'pending';
-- "It must be missing an index" - but which one?
-```
-
-**Correct (use EXPLAIN ANALYZE):**
-
-```sql
-explain (analyze, buffers, format text)
-select * from orders where customer_id = 123 and status = 'pending';
-
-- Output reveals the issue:
-- Seq Scan on orders (cost=0.00..25000.00 rows=50 width=100) (actual time=0.015..450.123 rows=50 loops=1)
--   Filter: ((customer_id = 123) AND (status = 'pending'::text))
--   Rows Removed by Filter: 999950
--   Buffers: shared hit=5000 read=15000
-- Planning Time: 0.150 ms
-- Execution Time: 450.500 ms
-```
-
-Key things to look for:
-
-```sql
-- Seq Scan on large tables = missing index
-- Rows Removed by Filter = poor selectivity or missing index
-- Buffers: read >> hit = data not cached, needs more memory
-- Nested Loop with high loops = consider different join strategy
-- Sort Method: external merge = work_mem too low
-```
-
-Reference: [EXPLAIN](https://supabase.com/docs/guides/database/inspect)