You can store XML in your table using XMLTYPE column data type or the good old VARCHAR2 provided that XML document is no more than 4000 characters.
I made a quick comparison between both options to help you access which option is a better choice for your situation.
Test environment: Oracle 126.96.36.199, 64-bit running on Red Hat Linux 64-bit.
Test case setup: Created 2 tables, each table has a single column only. One table with column type VARCHAR2 (4000) while the other table XMLTYPE column type.
|Space utilization||Insert 65,000 rows XML rows in both tables||VARCHAR table Size: 520 MB.
XML table Size: 168 MB. Note that are an additional LOB segment and a LOB index segments created for XML type.
|Storing XML data in column type XMLTYPE saved 3X space as compared to VARCHAR table. That is expected because XMLTYPE is stored in binary format.|
|Syntax Checking||Insert data with incorrect XML format||XMLTYPE table rejected the row, while VARCHAR table accepted data||This might be viewed as positive or negative point depending on your situation.|
|Insert Performance||Insert 4,000 rows sequentially. A single commit at the end.||VARCHAR table: 0.3 sec
XMLTYPE table: 1.3 sec
|VARCHAR table 3X faster than XMLTYPE.
None of the tables had indexes.
|Querying table based on an value within a XML document||Create index on xml table with “extractvalue” option.
No index created on VARCHAR table
|XML is always faster that VARCHAR table in retrieving data||There is so much flexibility and performance gains in retrieving data with XMLTYPE column type than VARCHAR table|
Hope this helps