Oracle compatibility - Databases Ranked

Detailed Comparison

Typical Code Conversion Effort

Target                                     Estimated Auto Conversion

EPAS                                             85-95%

Db2                                                80-90%

Aurora PostgreSQL                       60-80%

PostgreSQL                                   50-75%

My Recommendation

For enterprise Oracle modernization projects:

• Need highest Oracle compatibility → EDB Postgres Advanced Server

• Need cloud-native AWS target → Aurora PostgreSQL

• Need near-Oracle compatibility plus enterprise support → Db2

• Need lowest licensing costs → Community PostgreSQL

For complex Oracle workloads with heavy use of PL/SQL Packages, DBMS_SCHEDULER, Advanced Queuing, Autonomous Transactions, Materialized Views, and Oracle-specific features, EDB EPAS is by far the closest Oracle-compatible database outside Oracle itself.