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Oracle Express (XE) - Oracle Expresscontain some DBA features, including basic read-onlyreplication.

When choosing the appropriate Oracle edition for yourshop you must recognize those database features that youreally need. There are many features of EE that are notavailable in SE, for example.

Many companies that choose to forgo the advancedfeatures of the Enterprise Edition may save thousands ofdollars per year in licensing fees. The features availablein Oracle Enterprise Edition that are not available inOracle SE and SEO include many features that yourapplication may not require. Note: This article was first written in 2005 and thingschange, so please re-verify this information.

Advanced Replication - This tool provides one-way andmulti-master replication (via database links) fordistributed systems using the dbms_repcat package.

Transparent Application Failover (TAF) - Used tore-direct in-flight transactions to a failover databasein the case of a server crash.Thisis available in Oracle SEO as of release 10.1.

Fast-start fault recovery - This is a method forquickly recover and synchronize the Oracle database incases of hardware failure.

Oracle Data Guard - Data Guard is a semi-automatedstandby/failover database for database replication.

Advanced Queuing - A software scheng package foradvanced scheng the serialization using the dbms_aqadm package.This is available in Oracle SEO asof release 10.1.

SQL Optimizer Plan Stability (Stored Outlines) -This is a tool to freeze Oracle execution plans duringsoftware upgrades and change vendor SQL when you cannottouch the source SQL.

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