Data dictionary Oracle Database related data dictionary topics. Data type conversion table: Informix to OracleBOOLEAN data typeCHAR and VARCHAR data typesNumeric data typesDATE and DATETIME data typesINTERVAL data typeSERIAL and BIGSERIAL data typesROWID columnsThe RAW data typeTEXT and BYTE (LOB) typesTable constraintsName resolution of SQL objectsNULLs in indexed columns