How to access Oracle from C++ on Linux ?

It is
Oracle C++ Call Interface
Oracle C++ Call Interface (OCCI) is a high-performance and comprehensive API to access the Oracle database. Based on Standard C++ and object-oriented paradigm, OCCI is designed for improved productivity and quality in developing Oracle database applications.

Introduced in Oracle9i, OCCI is being successfully used for client-server, middle-tier, and complex object modeling applications.

The Instant Client feature makes it extremely easy and fast to deploy an OCCI based application by eliminating the need and disk space of a full Oracle Client install. Users just need to install a small sized archive containing all the Oracle dynamic libraries to run their OCCI applications.

What's new in OCCI in Oracle 11g R1 release :

* Database Resident Connection Pooling(DRCP)
* SecureFile LOBs, Compression, Encryption, and Deduplication
* Client ResultSet cache
* Runtime Connection Load balancing
* Fault Diagnosability
* Objects access performance improvements