What is cx_Oracle? cx_Oracle is a Python extension module that allows access to Oracle and conforms to the Python database API 2.0 specifications with a few exceptions. Where do I get it? http://cx-oracle.sourceforge.net What's new? 1) Added support for database change notification available in Oracle 10g Release 2 and higher. 2) Fixed bug where NCLOB data would be corrupted upon retrieval (non Unicode mode) or would generate exception ORA-24806 (LOB form mismatch). Oracle insists upon differentiating between CLOB and NCLOB no matter which character set is being used for retrieval. 3) Added new attributes size, bufferSize and numElements to variable objects, deprecating allocelems (replaced by numElements) and maxlength (replaced by bufferSize) 4) Avoided increasing memory allocation for strings when using variable width character sets and increasing the number of elements in a variable during executemany(). 5) Tweaked code in order to ensure that cx_Oracle can compile with Python 3.0.1.