Skip to main content

Differences between Oracle and Mysql

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.


Labels:

Comments

Post a Comment

Popular posts from this blog

Oracle Database 19c Step by Step Installation On Oracle Linux 7.6

This post describes the installation of Oracle Database 19c 64-bit on Oracle Linux 7.6  x86-64 bit. The Linux server needs a minimum of 3G swap and secure Linux set to permissive. An example of this type of Linux installation can be seen here . Download Software Download the Oracle software from oracle edelivery . Oracle Installation Prerequisites Automatic Setup Use the "oracle-database-preinstall-19c" package to perform all your prerequisite setup. # yum install -y oracle-database-preinstall-19c If you are using RHEL7 or CentOS7, you can pick up the PRM from the OL7 repository and install it. It will pull the dependencies from your normal repositories. # yum install -y https://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/getPackage/oracle-database-preinstall-19c-1.0-1.el7.x86_64.rpm Hosts File Set a fully qualified name for the server in the "/etc/hosts" file. < IP-address > < fully-qualified-machine-name > < machin...
9 comments
Read more

How to Delete Old Trace & Dump files with ADRCI

The ADRCI command interpreter has multiple features:- Create a package with incident or problem information for Oracle Support Analyze diagnostic data within the Automatic Diagnostic Repository (ADR) Run health checks In this post, we'll be concentrating on deleting the old diagnostic files with ADRCI. Set your environment and run the ADRCI utility: $ adrci Use the following command to list the ADR homes: adrci> show home ADR Homes: diag/rdbms/db11g/DB11G diag/tnslsnr/sol10/listener Choose the ADR home from the list above: adrci> set home diag/rdbms/db11g/DB11G Check the current retention policy: adrci> show control Check the following columns in the output: LONGP_POLICY:- It is set to 365 days by default. It is responsible for Incidents and Health Monitor warnings. SHORTP_POLICY:- It is set to 30 days by default. It manages the trace and core dump files. Use the following commands to change the retention policy: Specify the time in hours: 10 Days = 240 ...
1 comment
Read more

Oracle Database 12C Error Codes, Solutions and Suggestions from ORA-19700 to ORA-20000

Oracle 12C Error Codes, Solutions and Suggestions from ORA 19700 to ORA 20000 ORA-19700: device type exceeds maximum length of string Cause:  The device type indicated is invalid. Action:  Supply a correct device type and retry the allocation. ORA-19701: device name exceeds maximum length of  string Cause:  The device name indicated is invalid. Action:  Supply a correct device name and retry the allocation. ORA-19702: device parameter exceeds maximum length of  string ORA-19703: device command string exceeds maximum length of  string Cause:  The device command string exceeds maximum length. Action:  Correct the command and retry the operation. ORA-19704: file name exceeds maximum length of  string Cause:  The specified file name, which was a parameter to a copy, backup, or restore operation, exceeds the maximum file name length for this operating system. Action:  Retry the operation with a s...
Post a Comment
Read more