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of 27Explain the basic workflow of Flyway migrations.
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Flyway follows a simple workflow:
- Create migration scripts with proper naming convention
- Place scripts in the configured migration directory
- Run Flyway migrate command to apply pending migrations
- Flyway tracks applied migrations in a schema history table
- Validates migration integrity on subsequent runs
The tool automatically detects new migrations and applies them in order based on version numbers.
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What are the different types of migrations in Flyway?
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Flyway supports three types of migrations:
- Versioned Migrations: Applied exactly once, have version numbers
- Example:
V1__Create_user_table.sql
- Example:
- Repeatable Migrations: Applied whenever their checksum changes
- Example:
R__Update_user_view.sql
- Example:
- Undo Migrations: Used to reverse versioned migrations
- Example:
U1__Undo_Create_user_table.sql
- Example:
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Explain Flyway's naming convention for migration files.
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Flyway uses a strict naming convention:
Format: <Prefix><Version>__<Description>.<Suffix>
- Prefix: V (versioned), R (repeatable), U (undo)
- Version: Dots or underscores separated (V1, V1.1, V1_2_1)
- Separator: Double underscore (__)
- Description: Descriptive text with underscores
- Suffix: .sql (default)
Examples:
V1__Initial_schema.sql
V1.1__Add_user_email.sql
V2__Create_orders_table.sql
R__Update_statistics_view.sql
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What is the info command and what information does it provide?
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The info command displays the status of all migrations without applying any changes.
Information provided:
- Current schema version
- List of applied migrations
- Pending migrations
- Migration status (Success, Failed, Pending)
- Description and execution details
Example output:
Version | Description | State
-----------|------------------|----------
1 | Initial schema | Success
1.1 | Add user email | Success
2 | Create orders | Pending
Usage: flyway info - Essential for understanding migration state before applying changes.
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What are Flyway's licensing models and feature differences?
What is the schema history table and what information does it store?
How do you configure Flyway in a Spring Boot application?
What is baseline migration and when would you use it?
Explain the difference between migrate and repair commands.
What are Flyway callbacks and provide examples of their usage?
How do you handle placeholders in Flyway migrations?
What is the clean command and why should it be used cautiously?
How do you handle out-of-order migrations in Flyway?
Explain Flyway's validation process and what triggers validation failures.
How would you integrate Flyway with Maven build process?
How do you handle database-specific SQL in Flyway migrations?
Explain Flyway's location resolution and migration discovery.
What are repeatable migrations and when should you use them?
How do you configure Flyway for multiple schemas?
Explain Flyway's dry run functionality and its benefits.
What are the key considerations for using Flyway in production environments?
How do you implement rollback functionality in Flyway?
Explain how Flyway handles concurrent migrations in team environments.
What are the performance implications of Flyway migrations?
How do you implement blue-green deployments with Flyway?
How do you handle Flyway migrations in microservices architecture?
What are the security considerations when using Flyway in production?
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