If you have a database to be moved from Oracle to MySQL or vice versa, make sure that you learn about all the pros and cons of each before you implement it. Read on to know more about how Oracle and MySQL (or its forks MariaDB and Percona)can be advantageous over each other in various aspects.
Advantages of Oracle over MySQL
- High level of security. You can also have roles and have the ability to deny privileges, while MySQL will only be able to grant roles.
- There are options for external authentication such as LDAP, Active Directory etc. The authentication method in MySQL is only the built-in one.
- You can search full-text in Oracle. Only non-transactional storages can be searched completely in MySQL.
- In case of error recovery, the options available are much better in Oracle.
- There are multiple IDEs and complex tools available for debugging.
- It can also be integrated with Business Intelligence applications seamlessly.
Drawbacks of Oracle
- As this product belongs to Oracle, it comes with a high price tag associated with it; while MySQL proves to be economical.
- The complexity of Oracle is greater when compared to MySQL, due to which a certain level of expertise is required to install and maintain an Oracle database system.
Advantages of MySQL over Oracle
- MySQL is open source and easy to use.
- Small systems can be implemented easily; while it gets complex in case of large and sophisticated systems.
- The operational and ownerships costs are relatively lower when compared to Oracle. Also, MySQL is not as hardware intensive as Oracle.
- Multiple storage engines can exist for different tables.
- The storage engines can have different features, behavior and properties.
- Even the free version can be replicated with much ease.
Drawbacks of MySQL
- User-defined types are not supported.
- The pre-stored procedures and triggers can also achieve basic functionalities.
- Functional columns that are to be calculated based on expression are not supported.
- Statements such as “ALTER” or “CREATE” are non-transactional.
- Materialized views and sequences are not supported.
- Only roll-forward is possible; while roll-back recovery is not supported.
- Generally, foreign keys are not available.
- Recursion in queries is not possible.
- Fractional aspects of seconds are not supported.
Based on the above points, if you still want to proceed with migration of your database, you can go ahead by automating the entire process. There are two products that are offered by Intelligent Converters to convert Oracle to MySQL, MariaDB or Percona and backward; so that minimal user interference is required during the database migration. It also supports command line to write scripts, schedule and automate migration between Oracle and MySQL.