Schema Comparator Skill

Compares database schemas between source and target environments to identify differences and generate migration scripts.

Purpose

Enable database migration planning for:

• Schema diff generation
• Data type mapping
• Constraint comparison
• Index analysis
• Migration script generation

Capabilities

1. Schema Diff Generation

• Compare table structures
• Identify column differences
• Detect missing objects
• Generate change reports

2. Data Type Mapping

• Map types across databases
• Handle type conversions
• Identify precision changes
• Document compatibility

3. Constraint Comparison

• Compare primary keys
• Analyze foreign keys
• Check unique constraints
• Verify check constraints

4. Index Analysis

• Compare index definitions
• Identify missing indexes
• Analyze index usage
• Recommend optimizations

5. Stored Procedure Comparison

• Compare procedure signatures
• Identify logic differences
• Detect parameter changes
• Flag deprecated procedures

6. Migration Script Generation

• Generate DDL scripts
• Create rollback scripts
• Handle dependencies
• Order changes correctly

Tool Integrations

Tool	Databases	Integration Method
Flyway	Multi	CLI
Liquibase	Multi	CLI
Redgate SQL Compare	SQL Server	CLI
SchemaHero	Kubernetes	CLI
pgdiff	PostgreSQL	CLI
mysqldiff	MySQL	CLI

Output Schema

{
  "comparisonId": "string",
  "timestamp": "ISO8601",
  "source": {
    "type": "string",
    "connection": "string"
  },
  "target": {
    "type": "string",
    "connection": "string"
  },
  "differences": {
    "tables": {
      "added": [],
      "removed": [],
      "modified": []
    },
    "columns": [],
    "constraints": [],
    "indexes": [],
    "procedures": []
  },
  "migration": {
    "scripts": [],
    "order": [],
    "rollback": []
  }
}

Integration with Migration Processes

• database-schema-migration: Primary comparison tool
• data-format-migration: Schema analysis

Related Skills

• data-migration-validator: Post-migration validation
• query-translator: SQL conversion

Related Agents

• database-migration-orchestrator: Uses for planning
• data-architect-agent: Schema design review