Implement Snowflake reliability patterns: replication, failover, Time Travel recovery,
and application-level resilience for Snowflake integrations.
Use when building fault-tolerant pipelines, configuring disaster recovery,
or adding resilience to production Snowflake services.
Trigger with phrases like "snowflake reliability", "snowflake failover",
"snowflake replication", "snowflake disaster recovery", "snowflake Time Travel".
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Implement Snowflake reliability patterns: replication, failover, Time Travel recovery,
and application-level resilience for Snowflake integrations.
Use when building fault-tolerant pipelines, configuring disaster recovery,
or adding resilience to production Snowflake services.
Trigger with phrases like "snowflake reliability", "snowflake failover",
"snowflake replication", "snowflake disaster recovery", "snowflake Time Travel".
allowed-tools
Read, Write, Edit
version
1.5.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
["saas","data-warehouse","analytics","snowflake"]
compatibility
Designed for Claude Code
Snowflake Reliability Patterns
Overview
Production-grade reliability patterns for Snowflake: database replication, account failover, Time Travel recovery, and application-level circuit breakers.
Instructions
Step 1: Time Travel for Point-in-Time Recovery
-- Query historical data (up to 90 days on Enterprise Edition)SELECT*FROM orders
AT (TIMESTAMP=>'2026-03-21 14:00:00'::TIMESTAMP_NTZ);
-- Restore a table to a previous stateCREATEOR REPLACE TABLE orders
CLONE orders AT (TIMESTAMP=>'2026-03-21 14:00:00'::TIMESTAMP_NTZ);
-- Restore a dropped table
UNDROP TABLE orders;
UNDROP SCHEMA my_schema;
UNDROP DATABASE my_database;
-- Query by offset (5 minutes ago)SELECT*FROM orders AT (OFFSET=>-300);
-- Query by statement ID (before a specific query ran)SELECT*FROM orders BEFORE (STATEMENT =>'<query_id_of_bad_update>');
-- Set retention period per tableALTER TABLE critical_data SET DATA_RETENTION_TIME_IN_DAYS =90;
ALTER TABLE temp_staging SET DATA_RETENTION_TIME_IN_DAYS ;
=
0
-- No Time Travel
Step 2: Database Replication Across Regions
-- Enable replication on source account (primary)ALTER DATABASE PROD_DW ENABLE REPLICATION TO ACCOUNTS
myorg.us_east_account,
myorg.eu_west_account;
-- On target account: create replica databaseCREATE DATABASE PROD_DW_REPLICA
AS REPLICA OF myorg.us_west_account.PROD_DW;
-- Refresh replica (manual or scheduled)ALTER DATABASE PROD_DW_REPLICA REFRESH;
-- Check replication statusSELECT*FROMTABLE(INFORMATION_SCHEMA.DATABASE_REPLICATION_USAGE_HISTORY(
DATE_RANGE_START => DATEADD(hours, -24, CURRENT_TIMESTAMP())
));
-- Check replication lagSELECT database_name, primary_snowflake_region,
replication_allowed, is_primary,
DATEDIFF('minute', snowflake_region_last_refresh_time, CURRENT_TIMESTAMP()) AS lag_minutes
FROMTABLE(INFORMATION_SCHEMA.REPLICATION_DATABASES())
WHERE database_name ='PROD_DW_REPLICA';
Step 3: Account Failover Groups
-- Create failover group (replicates databases, warehouses, roles, etc.)-- On primary account:CREATE FAILOVER GROUP prod_failover
OBJECT_TYPES = DATABASES, WAREHOUSES, ROLES, USERS, INTEGRATIONS
ALLOWED_DATABASES = PROD_DW
ALLOWED_ACCOUNTS = myorg.us_east_account
REPLICATION_SCHEDULE ='10 MINUTE';
-- On secondary account: create as replicaCREATE FAILOVER GROUP prod_failover
AS REPLICA OF myorg.us_west_account.prod_failover;
-- Promote secondary to primary (during outage)ALTER FAILOVER GROUP prod_failover PRIMARY;
-- After recovery, switch back-- On original primary:ALTER FAILOVER GROUP prod_failover PRIMARY;
-- Idempotent data loading (safe to retry)MERGEINTO silver.orders AS target
USING (
SELECT*FROM bronze.raw_orders
WHERE ingestion_time >= DATEADD(hours, -1, CURRENT_TIMESTAMP())
) AS source
ON target.order_id = source.order_id
WHENNOT MATCHED THENINSERT
(order_id, customer_id, amount, order_date)
VALUES
(source.order_id, source.customer_id, source.amount, source.order_date);
-- MERGE is idempotent: running it twice with the same data produces the same result-- Prefer MERGE over INSERT for retry-safe pipelines-- Task retry configurationCREATEOR REPLACE TASK reliable_transform
WAREHOUSE = ETL_WH
SCHEDULE ='5 MINUTE'
ALLOW_OVERLAPPING_EXECUTION =FALSE-- Prevent concurrent runs
SUSPEND_TASK_AFTER_NUM_FAILURES =3-- Auto-suspend after 3 failuresWHENSYSTEM$STREAM_HAS_DATA('orders_stream')
ASMERGEINTO dim_orders ...;
ALTER TASK reliable_transform RESUME;
Step 6: Backup Strategy
-- Zero-copy clone backups (instant, no extra storage until data changes)CREATE DATABASE PROD_DW_BACKUP_20260322
CLONE PROD_DW;
-- Automated daily backup via taskCREATEOR REPLACE TASK daily_backup
WAREHOUSE = ADMIN_WH
SCHEDULE ='USING CRON 0 3 * * * UTC'ASBEGIN
LET backup_name VARCHAR :='PROD_DW_BACKUP_'|| TO_CHAR(CURRENT_DATE(), 'YYYYMMDD');
EXECUTE IMMEDIATE 'CREATE DATABASE IF NOT EXISTS '|| :backup_name ||' CLONE PROD_DW';
-- Clean up backups older than 7 days-- (done via separate cleanup task or stored procedure)END;
