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Grouping related tables in a database using separate schemas is an effective way to introduce logical isolation, especially in a modular monolith architecture. Each module can have its own schema, containing only its relevant tables, making it easier to manage and distinguish data ownership.
Key Benefits:
- Logical Separation: Clear distinction between modules.
- Simplified Maintenance: Easier to manage permissions and access.
- Scalability: Prepares the system for potential microservice migration.
Learn more here: https://lnkd.in/eKFh45mw
You Should Know:
SQL Commands for Schema Management
1. Create a Schema:
CREATE SCHEMA module_name;
2. Assign Tables to a Schema:
CREATE TABLE module_name.table_name (id INT PRIMARY KEY, name VARCHAR(100));
3. Grant Permissions:
GRANT SELECT, INSERT ON SCHEMA::module_name TO db_user;
4. Query Across Schemas:
SELECT FROM module1.table1 JOIN module2.table2 ON module1.table1.id = module2.table2.id;
Linux/Windows Commands for Database Management
- PostgreSQL (Linux):
psql -U username -d dbname -c "SELECT FROM module_name.table_name;"
- SQL Server (Windows/PowerShell):
Invoke-SqlCmd -Query "SELECT FROM module_name.table_name" -ServerInstance "SERVER_NAME"
Transaction Handling Across Schemas
- Use Saga Pattern for distributed transactions:
// Example in .NET using MassTransit services.AddMassTransit(x => { x.AddSagaStateMachine<OrderSaga, OrderState>(); });
What Undercode Say:
Schema isolation is a powerful technique for maintaining clean architecture in modular monoliths. While it doesn’t enforce physical separation like microservices, it provides a structured way to manage data access and permissions.
Key Commands to Remember:
- Backup a Schema (PostgreSQL):
pg_dump -U user -n module_name dbname > module_backup.sql
- List All Schemas (SQL Server):
SELECT name FROM sys.schemas;
- Revoke Access (MySQL):
REVOKE ALL PRIVILEGES ON module_name. FROM 'user'@'host';
For deeper isolation, consider Row-Level Security (RLS) or Database Sharding in future scaling.
Expected Output:
A well-structured modular monolith with clear schema separation, easier debugging, and controlled data access.
URLs:
References:
Reported By: Milan Jovanovic – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
