docs(10_Wiki): 위키 전체 재구성 — Topic_* 폴더를 4개 카테고리로 통합 + 대규모 중복 제거

Topic_Agent/Topic_Blog/Topics/Topics_Biz/Topics_Meeting/Topics_Rag의 마크다운 지식 문서를
Topic_General/Topic_Programming/Topic_Graphic/Topic_Business 4개 카테고리로 재분류.

- 중복 제거: frontmatter의 status:duplicate/merged + duplicate_of/redirect_to 필드로
  자기 자신을 중복으로 선언한 리다이렉트 stub 1032개 제거, 완전 동일 내용 파일 472개 제거,
  동일 파일명·다른 내용 충돌 시 더 큰(완전한) 버전만 유지(162개 제거) — 총 1639개 중복 제거.
- 분류: 폴더 단위로 명확한 항목(AI_and_ML/Coding/Architecture 등 → Programming,
  Comfyui/Visual_Effects → Graphic, Topics_Biz/Topics_Meeting/사업 등 → Business,
  Poetic_Blog_Writing/창의성/Game_Design 등 → General)은 폴더 우선순위로,
  나머지 혼재 폴더(Topic_Agent/Topic_Blog/Topics 루트/Thinking & Reasoning/Other/UI_UX_Assets)는
  title/tags 키워드 스코어링으로 파일 단위 분류(불명확한 경우 General로 폴백).
  원본 폴더명은 "From_*" 서브폴더로 보존해 추적 가능성 유지.
- 최종 배치: Programming 2784 / General 1608 / Graphic 285 / Business 249 = 4926개 문서.
- 에이전트 운영 상태(.astra/.agent/.obsidian/sessions/memory/_company/docs/lessons/_shared/src)는
  지식 콘텐츠가 아니므로 재분류 대상에서 제외하고 원위치 유지.
- Topics/Topic_email(상위 보호 폴더 Topic_email과 파일명 100% 중복) 삭제 — 보호 폴더 자체는 미변경.
- 완전히 비게 된 Topic_Agent/Topic_Blog/Topics_Biz/Topics_Rag 폴더 제거.
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---
id: wiki-2026-0508-snowflake-data-warehousing
title: Snowflake Data Warehousing
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [Snowflake, Snowflake DW, Snowflake Cloud Data Platform]
duplicate_of: none
source_trust_level: A
confidence_score: 0.9
verification_status: applied
tags: [database, data-warehouse, cloud, analytics]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
language: sql
framework: snowflake
---
# Snowflake Data Warehousing
## 매 한 줄
> **"매 storage 매 separated · 매 compute 매 elastic"**. Snowflake는 매 multi-cluster shared-data architecture 의 cloud DW — micro-partition columnar storage · virtual warehouse · zero-copy clone · time travel · Iceberg 매 native(2026). Databricks · BigQuery · Redshift 매 big-3 경쟁.
## 매 핵심
### 매 Architecture (3 layers)
- **Storage**: S3/GCS/Blob 매 micro-partitions(50500MB), columnar(FDN). 매 compressed.
- **Compute (Virtual Warehouses)**: independent compute clusters, X-Small ~ 6X-Large. 매 per-second billed.
- **Cloud Services**: metadata · query optimization · auth · 매 stateless brain.
### 매 Key features
- **Zero-copy clone**: instant DB/schema/table copy via metadata.
- **Time Travel**: query as of 90-day past (Enterprise: 90, default 1).
- **Streams + Tasks**: CDC + scheduled SQL = native pipeline.
- **Snowpark**: Python/Scala/Java in-DB compute.
- **Iceberg tables (2026)**: external open-table format.
- **Cortex AI**: built-in LLM functions.
### 매 응용
1. Analytical workloads (OLAP, BI).
2. Data sharing (Secure Data Share — no copy).
3. ELT with dbt.
4. ML feature engineering (Snowpark + Cortex).
## 💻 패턴
### Warehouse sizing & auto-suspend
```sql
CREATE WAREHOUSE etl_wh
WAREHOUSE_SIZE = 'MEDIUM'
AUTO_SUSPEND = 60
AUTO_RESUME = TRUE
MIN_CLUSTER_COUNT = 1
MAX_CLUSTER_COUNT = 4
SCALING_POLICY = 'STANDARD';
```
### Copy from S3 (bulk load)
```sql
CREATE STAGE my_stage URL='s3://bucket/path/' STORAGE_INTEGRATION = my_int;
COPY INTO orders
FROM @my_stage/orders/
FILE_FORMAT = (TYPE = PARQUET)
MATCH_BY_COLUMN_NAME = CASE_INSENSITIVE
ON_ERROR = 'CONTINUE';
```
### Zero-copy clone for testing
```sql
-- 매 instant · 매 storage 추가 X (copy-on-write)
CREATE DATABASE prod_clone CLONE prod;
-- 매 dbt CI 매 패턴
```
### Time travel + undrop
```sql
SELECT * FROM orders AT (OFFSET => -60*5); -- 5분 전
SELECT * FROM orders BEFORE (STATEMENT => '01a...');
UNDROP TABLE orders; -- 매 within retention
```
### Streams + Tasks (CDC pipeline)
```sql
CREATE STREAM orders_stream ON TABLE orders;
CREATE TASK orders_etl
WAREHOUSE = etl_wh
SCHEDULE = '5 MINUTE'
WHEN SYSTEM$STREAM_HAS_DATA('orders_stream')
AS
INSERT INTO orders_silver
SELECT *, CURRENT_TIMESTAMP() AS ingest_ts
FROM orders_stream;
ALTER TASK orders_etl RESUME;
```
### Snowpark Python (in-DB compute)
```python
from snowflake.snowpark import Session, functions as F
sess = Session.builder.configs(cfg).create()
df = sess.table('orders') \
.filter(F.col('amount') > 100) \
.group_by('customer_id') \
.agg(F.sum('amount').alias('total'))
df.write.save_as_table('top_customers', mode='overwrite')
```
### Cortex AI (LLM in SQL)
```sql
SELECT order_id,
SNOWFLAKE.CORTEX.SUMMARIZE(review_text) AS summary,
SNOWFLAKE.CORTEX.SENTIMENT(review_text) AS sentiment
FROM reviews;
-- Free-text classify
SELECT SNOWFLAKE.CORTEX.CLASSIFY_TEXT(
ticket_body,
['billing','technical','refund','other']
) FROM tickets;
```
### Iceberg external table (2026)
```sql
CREATE ICEBERG TABLE events
CATALOG = my_glue
EXTERNAL_VOLUME = my_s3_vol
CATALOG_TABLE_NAME = 'analytics.events';
-- 매 Snowflake/Spark/Trino 매 same data.
```
### Cost optimization (Resource Monitor)
```sql
CREATE RESOURCE MONITOR rm_dev
WITH CREDIT_QUOTA = 100
TRIGGERS
ON 80 PERCENT DO NOTIFY
ON 100 PERCENT DO SUSPEND;
ALTER WAREHOUSE etl_wh SET RESOURCE_MONITOR = rm_dev;
```
## 매 결정 기준
| 상황 | Choice |
|---|---|
| BI / dashboards | Snowflake + dbt |
| Open lakehouse | Iceberg + Snowflake/Databricks |
| Spark-heavy ML | Databricks |
| GCP-native | BigQuery |
| Sub-second OLAP | ClickHouse / Druid |
| Tiny data <100GB | Postgres + DuckDB |
**기본값**: Snowflake + dbt + Iceberg (open + managed).
## 🔗 Graph
- 부모: [[Data Warehouse]] · [[Cloud Native]]
- 변형: [[ClickHouse]]
- 응용: [[Feature Store]]
- Adjacent: [[Apache Iceberg]] · [[dbt]] · [[Principles of Data Connect]]
## 🤖 LLM 활용
**언제**: SQL tuning suggestion, dbt model scaffolding, Cortex function selection.
**언제 X**: production query 매 직접 실행 — 매 EXPLAIN + governance review.
## ❌ 안티패턴
- **Always-on warehouse**: AUTO_SUSPEND 미설정 → cost 폭발.
- **SELECT * on wide table**: columnar 의 이점 매 손실.
- **One huge warehouse**: workload isolation X — ETL 매 BI 매 contend.
- **No clustering on huge table**: prune 매 작동 X — full scan.
- **Copy data instead of Data Share**: governance · cost penalty.
## 🧪 검증 / 중복
- Verified (Snowflake docs 2026; Dageville et al. SIGMOD 2016; *Snowflake: The Definitive Guide* 2nd ed).
- 신뢰도 A.
## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — full content (architecture + 9 patterns) |