Oracle – Best Way to Create a Table with 800 Columns

ALL_TAB_PRIVS is a superset of ALL_TAB_PRIVS_RECD. You probably want ALL_TAB_PRIVS as it includes tables that the current user owns.

You can query your XML data directly in SQL with XMLTABLE:

SQL> VARIABLE xml VARCHAR2(4000);
SQL> BEGIN :xml :=
  2  '<rowset>
  3       <row>
  4           <name>tom</name>
  5           <family>mack</family>
  6       </row>
  7       <row>
  8           <name>marry</name>
  9           <family>skot</family>
 10       </row>
 11   </rowset>';
 12  END;
 13  /

PL/SQL procedure successfully completed

SQL> SELECT x.*
  2    FROM XMLTable('for $i in /rowset/row return $i'
  3                    passing XMLTYPE(:xml) columns
  4                       name VARCHAR2(200) path 'name',
  5                       family VARCHAR2(200) path 'family'
  6                  ) x;

NAME    FAMILY
------- -------
tom     mack
marry   skot

You can also use XMLSequence and EXTRACT (see this SO question for example) but as noted in the documentation these functions are deprectated.

Another option is DBMS_XMLSTORE, although you can't really customize it much (needs perfect match between input xml tags and output column names):

SQL> CREATE TABLE my_table ("name" VARCHAR2(10), "family" VARCHAR2(10));

Table created

SQL> DECLARE
  2     l_ctx  dbms_xmlstore.ctxtype;
  3     l_rows NUMBER;
  4  BEGIN
  5     l_ctx := dbms_xmlstore.newcontext('MY_TABLE'); -- Get saved context
  6     dbms_xmlstore.clearUpdateColumnList(l_ctx); -- Clear the update settings
  7  
  8     -- Set the columns to be updated/inserted as a list of values
  9     dbms_xmlstore.setUpdateColumn(l_ctx, 'name');
 10     dbms_xmlstore.setUpdateColumn(l_ctx, 'family');
 11     -- Set ROW tag
 12     dbms_xmlstore.setRowTag(l_ctx, 'row');
 13  
 14    -- Insert the doc.
 15    l_rows := DBMS_XMLSTORE.insertXML(l_ctx, :xml);
 16    DBMS_OUTPUT.put_line(l_rows || ' rows inserted.');
 17  
 18    -- Close the context
 19    DBMS_XMLSTORE.closeContext(l_ctx);
 20  
 21  END;
 22  /

2 rows inserted.

PL/SQL procedure successfully completed

SQL> select * from my_table;

name       family
---------- ----------
tom        mack
marry      skot

I'm not sure performance-wise which option is faster, this certainly depends on the data -- you'll have to benchmark.