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Vix DB Production Guide ​

This guide explains how to use the Vix C++ DB module safely in production environments.

It focuses on:

  • Connection pooling strategy
  • Transactions best practices
  • Error handling
  • Migrations strategy
  • Performance recommendations
  • Security considerations

1. Connection Pooling Strategy ​

cpp
cfg.mysql.pool.min = 2;
cfg.mysql.pool.max = 16;

Guidelines:

  • Small apps: 2--4 connections
  • Medium apps: 8--16 connections
  • High traffic APIs: tune based on load testing

Why pooling matters:

  • Avoids connection creation overhead
  • Improves latency
  • Reduces database stress

Never create Database per request. Create it once at application startup.

2. Transaction Best Practices ​

Always use RAII transactions:

cpp
Transaction tx(db.pool());
// work
tx.commit();

Rules:

  • Keep transactions short
  • Do not perform network calls inside transactions
  • Commit explicitly
  • Let rollback happen automatically on exceptions

3. Error Handling ​

Always wrap DB logic in try/catch:

cpp
try {
    Transaction tx(db.pool());
    // DB logic
    tx.commit();
} catch (const std::exception& e) {
    log_error(e.what());
}

Never expose raw DB errors to HTTP clients.

4. Migrations in Production ​

Strategy:

  • Use versioned migrations
  • Never modify old migrations
  • Always add new migration files

Recommended flow:

  1. Deploy code
  2. Run migrations
  3. Restart services if needed

Keep migrations idempotent.

5. Performance Optimization ​

Use prepared statements everywhere.

Bad:

cpp
"SELECT * FROM users WHERE id = " + id

Good:

cpp
st->bind(1, id);

Add proper DB indexes:

  • Index foreign keys
  • Index frequently filtered columns
  • Avoid over-indexing

Measure before optimizing.

6. Security Best Practices ​

  • Never store plaintext passwords
  • Use environment variables for DB credentials
  • Limit DB user privileges
  • Use TLS connections in production
  • Rotate credentials periodically

7. Deployment Checklist ​

Before production:

  • Pool size tuned
  • Indexes verified
  • Migrations tested
  • Error logging enabled
  • Backups configured
  • Monitoring enabled

Final Advice ​

Database is critical infrastructure.

Treat it as:

  • Stateful
  • Sensitive
  • Performance-critical

Design carefully. Test under load. Monitor continuously.

Vix DB gives you control. Production reliability depends on your discipline.