postgres-patterns by affaan-m/everything-claude-code
npx skills add https://github.com/affaan-m/everything-claude-code --skill postgres-patternsPostgreSQL 最佳实践速查表。如需详细指导,请使用 database-reviewer 代理。
| 查询模式 | 索引类型 | 示例 |
|---|---|---|
WHERE col = value | B-tree (默认) | CREATE INDEX idx ON t (col) |
WHERE col > value | B-tree | CREATE INDEX idx ON t (col) |
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WHERE a = x AND b > y | 复合索引 | CREATE INDEX idx ON t (a, b) |
WHERE jsonb @> '{}' | GIN | CREATE INDEX idx ON t USING gin (col) |
WHERE tsv @@ query | GIN | CREATE INDEX idx ON t USING gin (col) |
| 时间序列范围查询 | BRIN | CREATE INDEX idx ON t USING brin (col) |
| 使用场景 | 正确类型 | 应避免 |
|---|---|---|
| ID | bigint | int, 随机 UUID |
| 字符串 | text | varchar(255) |
| 时间戳 | timestamptz | timestamp |
| 货币 | numeric(10,2) | float |
| 标志位 | boolean | varchar, int |
复合索引顺序:
-- 等值列在前,范围列在后
CREATE INDEX idx ON orders (status, created_at);
-- 适用于:WHERE status = 'pending' AND created_at > '2024-01-01'
覆盖索引:
CREATE INDEX idx ON users (email) INCLUDE (name, created_at);
-- 避免为 SELECT email, name, created_at 进行表查找
部分索引:
CREATE INDEX idx ON users (email) WHERE deleted_at IS NULL;
-- 索引更小,仅包含活跃用户
RLS 策略(优化版):
CREATE POLICY policy ON orders
USING ((SELECT auth.uid()) = user_id); -- 用 SELECT 包裹!
UPSERT:
INSERT INTO settings (user_id, key, value)
VALUES (123, 'theme', 'dark')
ON CONFLICT (user_id, key)
DO UPDATE SET value = EXCLUDED.value;
游标分页:
SELECT * FROM products WHERE id > $last_id ORDER BY id LIMIT 20;
-- O(1) 复杂度,而 OFFSET 是 O(n)
队列处理:
UPDATE jobs SET status = 'processing'
WHERE id = (
SELECT id FROM jobs WHERE status = 'pending'
ORDER BY created_at LIMIT 1
FOR UPDATE SKIP LOCKED
) RETURNING *;
-- 查找未建立索引的外键
SELECT conrelid::regclass, a.attname
FROM pg_constraint c
JOIN pg_attribute a ON a.attrelid = c.conrelid AND a.attnum = ANY(c.conkey)
WHERE c.contype = 'f'
AND NOT EXISTS (
SELECT 1 FROM pg_index i
WHERE i.indrelid = c.conrelid AND a.attnum = ANY(i.indkey)
);
-- 查找慢查询
SELECT query, mean_exec_time, calls
FROM pg_stat_statements
WHERE mean_exec_time > 100
ORDER BY mean_exec_time DESC;
-- 检查表膨胀
SELECT relname, n_dead_tup, last_vacuum
FROM pg_stat_user_tables
WHERE n_dead_tup > 1000
ORDER BY n_dead_tup DESC;
-- 连接限制(根据内存调整)
ALTER SYSTEM SET max_connections = 100;
ALTER SYSTEM SET work_mem = '8MB';
-- 超时设置
ALTER SYSTEM SET idle_in_transaction_session_timeout = '30s';
ALTER SYSTEM SET statement_timeout = '30s';
-- 监控
CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
-- 安全默认设置
REVOKE ALL ON SCHEMA public FROM public;
SELECT pg_reload_conf();
database-reviewer - 完整的数据库审查工作流clickhouse-io - ClickHouse 分析模式backend-patterns - API 和后端模式基于 Supabase Agent Skills (credit: Supabase team) (MIT License)
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Quick reference for PostgreSQL best practices. For detailed guidance, use the database-reviewer agent.
| Query Pattern | Index Type | Example |
|---|---|---|
WHERE col = value | B-tree (default) | CREATE INDEX idx ON t (col) |
WHERE col > value | B-tree | CREATE INDEX idx ON t (col) |
WHERE a = x AND b > y | Composite | CREATE INDEX idx ON t (a, b) |
WHERE jsonb @> '{}' | GIN | CREATE INDEX idx ON t USING gin (col) |
WHERE tsv @@ query | GIN | CREATE INDEX idx ON t USING gin (col) |
| Time-series ranges | BRIN | CREATE INDEX idx ON t USING brin (col) |
| Use Case | Correct Type | Avoid |
|---|---|---|
| IDs | bigint | int, random UUID |
| Strings | text | varchar(255) |
| Timestamps | timestamptz | timestamp |
| Money | numeric(10,2) |
Composite Index Order:
-- Equality columns first, then range columns
CREATE INDEX idx ON orders (status, created_at);
-- Works for: WHERE status = 'pending' AND created_at > '2024-01-01'
Covering Index:
CREATE INDEX idx ON users (email) INCLUDE (name, created_at);
-- Avoids table lookup for SELECT email, name, created_at
Partial Index:
CREATE INDEX idx ON users (email) WHERE deleted_at IS NULL;
-- Smaller index, only includes active users
RLS Policy (Optimized):
CREATE POLICY policy ON orders
USING ((SELECT auth.uid()) = user_id); -- Wrap in SELECT!
UPSERT:
INSERT INTO settings (user_id, key, value)
VALUES (123, 'theme', 'dark')
ON CONFLICT (user_id, key)
DO UPDATE SET value = EXCLUDED.value;
Cursor Pagination:
SELECT * FROM products WHERE id > $last_id ORDER BY id LIMIT 20;
-- O(1) vs OFFSET which is O(n)
Queue Processing:
UPDATE jobs SET status = 'processing'
WHERE id = (
SELECT id FROM jobs WHERE status = 'pending'
ORDER BY created_at LIMIT 1
FOR UPDATE SKIP LOCKED
) RETURNING *;
-- Find unindexed foreign keys
SELECT conrelid::regclass, a.attname
FROM pg_constraint c
JOIN pg_attribute a ON a.attrelid = c.conrelid AND a.attnum = ANY(c.conkey)
WHERE c.contype = 'f'
AND NOT EXISTS (
SELECT 1 FROM pg_index i
WHERE i.indrelid = c.conrelid AND a.attnum = ANY(i.indkey)
);
-- Find slow queries
SELECT query, mean_exec_time, calls
FROM pg_stat_statements
WHERE mean_exec_time > 100
ORDER BY mean_exec_time DESC;
-- Check table bloat
SELECT relname, n_dead_tup, last_vacuum
FROM pg_stat_user_tables
WHERE n_dead_tup > 1000
ORDER BY n_dead_tup DESC;
-- Connection limits (adjust for RAM)
ALTER SYSTEM SET max_connections = 100;
ALTER SYSTEM SET work_mem = '8MB';
-- Timeouts
ALTER SYSTEM SET idle_in_transaction_session_timeout = '30s';
ALTER SYSTEM SET statement_timeout = '30s';
-- Monitoring
CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
-- Security defaults
REVOKE ALL ON SCHEMA public FROM public;
SELECT pg_reload_conf();
database-reviewer - Full database review workflowclickhouse-io - ClickHouse analytics patternsbackend-patterns - API and backend patternsBased on Supabase Agent Skills (credit: Supabase team) (MIT License)
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float |
| Flags | boolean | varchar, int |