OpenX for MS SQL Server: Best Practices and Configuration Tips

Migrating to OpenX on MS SQL Server — Step-by-Step

Overview

This guide walks through a practical, step-by-step migration to OpenX on MS SQL Server. Assumptions: you’re migrating an existing OpenX (or compatible ad-serving) installation from another database (e.g., MySQL) or deploying OpenX afresh using MS SQL Server. Steps cover planning, preparation, schema/data migration, configuration, verification, and post-migration tuning.

1. Pre-migration planning

• Inventory: List OpenX version, extensions, custom code, and current database engine/version.
• Requirements: Confirm MS SQL Server edition/version supported by your OpenX version. Ensure SQL Server features (e.g., Full-Text Search) if required.
• Backup plan: Full backups of application files and source DB; snapshot/restore plan for SQL Server.
• Rollback criteria: Define clear success/failure checks (data integrity, app health, performance) and when to revert.
• Maintenance window: Schedule downtime and notify stakeholders.

2. Prepare the MS SQL Server environment

• Install/patch SQL Server: Provision a server with SQL Server (production-ready configuration).
• Security: Create a dedicated SQL login and a database user with least privileges required by OpenX. Use strong passwords and consider Windows authentication if applicable.
• Database creation: Create the target database and set appropriate collation (match app expectations, commonly SQL_Latin1_General_CP1_CI_AS or as required).
• Resource settings: Configure max memory, tempdb sizing, autogrowth settings, and file placement on fast storage.
• Backups: Configure regular backups and recovery model (Full for point-in-time; Simple if acceptable).

3. Map schema and data types

• Schema differences: Review OpenX schema for types/features that differ between source DB and MS SQL (e.g., AUTO_INCREMENT → IDENTITY, TEXT/BLOB types → VARCHAR(MAX)/VARBINARY(MAX), date/time types).
• Constraints and indexes: Note primary/foreign keys, unique constraints, and indexes — ensure they are re-created appropriately.
• Collation & case sensitivity: Ensure object and column collations match application assumptions to avoid string-matching bugs.

4. Exporting data from source

• Dump schema and data: Use a reliable export method (native dump, ETL tool, or scripted CSV exports). Export in logical order (parents before children) or use foreign-key-disabling techniques.
• Data cleaning: Normalize incompatible values (e.g., boolean representations, enum mappings), trim overly long strings that exceed MS SQL column limits, and convert binary blobs appropriately.
• Preserve IDs: If OpenX expects stable primary keys (e.g., creative IDs), plan to preserve them—use explicit ID inserts with IDENTITY_INSERT ON where needed.

5. Importing into MS SQL Server

• Schema creation: Run translated DDL on SQL Server to create tables, constraints, indexes. Validate data types and identity columns.
• Bulk load: Use BULK INSERT, bcp, SQL Server Integration Services (SSIS), or import wizard for large tables—disable nonclustered indexes during load for speed.
• Foreign keys and triggers: Re-enable or create FK constraints and triggers after loading, validating referential integrity.
• Sequences and identity seeds: Reset IDENTITY seeds with DBCC CHECKIDENT where necessary.

6. Configure OpenX application

• Database connection settings: Update OpenX configuration files to point to the MS SQL Server connection string, credentials, server name/port, and driver (ODBC/ADO/.NET provider).
• Drivers and extensions: Install required DB drivers on application servers (ODBC driver, SQL Server Native Client, or the appropriate PHP/Java DB extension).
• Connection pooling and timeouts: Tune pool size and timeouts for SQL Server behavior.
• SQL dialects: Adjust any custom SQL in code or plugins that use MySQL-specific syntax (LIMIT, backticks, CONCAT variations) to T-SQL equivalents (TOP, square brackets, + operator or CONCAT).

7. Functional verification

• Smoke tests: Start the app and test core workflows: login, campaign creation, impression/ click recording, report generation, creative upload.
• Data integrity checks: Compare record counts and sample rows between source and target for critical tables.
• Application logs: Monitor logs for DB errors, timeouts, or SQL syntax issues. Fix queries that fail under T-SQL.

8. Performance testing and tuning

• Index optimization: Review execution plans for slow queries and add/adjust indexes. Recreate statistics (UPDATE STATISTICS) and consider filtered or included-column indexes.
• Query tuning: Replace problematic queries or rewrite them for T-SQL (use SET-based operations, avoid cursors).
• Resource monitoring: Watch CPU, memory, disk I/O, and wait stats. Tune tempdb, MAXDOP, and keep statistics up-to-date.
• Caching: Ensure app-side caches are configured and warmed to reduce DB load.

9. Cutover

• Final sync: Put source in read-only mode or stop writes, do a final incremental export/import for changes since the initial migration.
• Switch configuration: Point DNS/load-balancer or app configuration to the new environment.
• Monitoring: Closely monitor for errors, latency spikes, lost data, and user reports during the first 24–72 hours.

10. Post-migration tasks

• Backups & maintenance plan: Ensure full, differential, and log backups are scheduled; index maintenance and statistics update jobs in place.
• Documentation: Update runbooks, connection strings, and architecture diagrams.
• Security review: Verify permissions, encryption-at-rest/TDE if required, and network access controls.
• Decommissioning: Safely retire or repurpose old DB servers after verification and retention period.

Quick checklist (summary)

• Inventory and backups done
• SQL Server provisioned and secured
• Schema mapped and created in SQL Server
• Data exported, cleaned, and imported successfully
• OpenX configured to use SQL Server drivers and connection strings
• Functional and performance tests passed
• Cutover completed and monitoring in place

If you want, I can create a migration checklist tailored to your OpenX version and current database (specify source DB, OpenX version, and SQL Server version).