Differences between Oracle and Mysql

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Some key differences for DBAs between Oracle and MySQL database servers include:
  • Oracle architecture is process based, MySQL architecture is thread based.
  • Different tools used for backup and recovery.
  • Database specific SQL syntax.
  • Database specific SQL functions.
  • Different syntax for stored routines. MySQL has no packages.
  • MySQL routines are not compiled and run in each session thread and not in global memory.
  • MySQL only supports row-level triggers.
  • Different tools used to manage and monitor database servers.
  • Different startup and shutdown processes.
  • Oracle RAC is a shared disk solution while MySQL Cluster is a shared nothing solution.
  • The default configuration for MySQL is very lenient in terms of data integrity. A MySQL DBA must tighten down data integrity for it to work like traditional databases.
  • With Oracle, the CREATE DATABASE command is used to create the physical storage for the database server.
  • With MySQL, the mysql_install_db script is used to create the physical storage for the database server.
  • The term "database" in Oracle means all the physical files associated with an instance.
  • The term "database" in MySQL means a schema. The term database and schema can be used interchangeably in MySQL.
  • In Oracle a database user owns all the schema objects.
  • In MySQL the database schema owns all the schema objects.
  • Oracle supports role based security. With MySQL, scripts and stored routines are used to programatically organize security permissions.
  • Oracle has a lot more feature functionality that makes it very popular.
  • MySQL has a lot less functionality than Oracle that makes it very popular.
  • Oracle has tons of options for creating a table. Different characteristics and behavior are defined with these options.
  • The key with MySQL tables are defining a storage engine with a table. The storage engine defines characteristics such as row level locking versus table level locking, referential integrity, support for different types of indexes and features. Different optimizations, storage, tuning and backup and recovery are required for each storage engine. Storage engines are a KEY feature in MySQL.
  • MySQL supports different ISOLATION levels of READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ AND SERIALIZABLE.


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